/**
 * @file llappviewer.cpp
 * @brief The LLAppViewer class definitions
 *
 * $LicenseInfo:firstyear=2007&license=viewerlgpl$
 * Second Life Viewer Source Code
 * Copyright (C) 2012, Linden Research, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation;
 * version 2.1 of the License only.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
 * $/LicenseInfo$
 */

#include "llviewerprecompiledheaders.h"

#include "llappviewer.h"

// Viewer includes
#include "llversioninfo.h"
#include "llfeaturemanager.h"
#include "lluictrlfactory.h"
#include "lltexteditor.h"
#include "llenvironment.h"
#include "llerrorcontrol.h"
#include "lleventtimer.h"
#include "llfile.h"
#include "llviewertexturelist.h"
#include "llgroupmgr.h"
#include "llagent.h"
#include "llagentcamera.h"
#include "llagentlanguage.h"
#include "llagentui.h"
#include "llagentwearables.h"
#include "lldirpicker.h"
#include "llfloaterimcontainer.h"
#include "llimprocessing.h"
#include "llwindow.h"
#include "llviewerstats.h"
#include "llviewerstatsrecorder.h"
#include "llkeyconflict.h" // for legacy keybinding support, remove later
#include "llmarketplacefunctions.h"
#include "llmarketplacenotifications.h"
#include "llmd5.h"
#include "llmeshrepository.h"
#include "llpumpio.h"
#include "llmimetypes.h"
#include "llslurl.h"
#include "llstartup.h"
#include "llfocusmgr.h"
#include "llurlfloaterdispatchhandler.h"
#include "llviewerjoystick.h"
#include "llallocator.h"
#include "llcalc.h"
#include "llconversationlog.h"
#if LL_WINDOWS
#include "lldxhardware.h"
#endif
#include "lltexturestats.h"
#include "lltrace.h"
#include "lltracethreadrecorder.h"
#include "llviewerwindow.h"
#include "llviewerdisplay.h"
#include "llviewermedia.h"
#include "llviewerparcelaskplay.h"
#include "llviewerparcelmedia.h"
#include "llviewershadermgr.h"
#include "llviewermediafocus.h"
#include "llviewermessage.h"
#include "llviewerobjectlist.h"
#include "llworldmap.h"
#include "llmutelist.h"
#include "llviewerhelp.h"
#include "lluicolortable.h"
#include "llurldispatcher.h"
#include "llurlhistory.h"
#include "llrender.h"
#include "llteleporthistory.h"
#include "lltoast.h"
#include "llsdutil_math.h"
#include "lllocationhistory.h"
#include "llfasttimerview.h"
#include "llvector4a.h"
#include "llviewermenufile.h"
#include "llvoicechannel.h"
#include "llvoavatarself.h"
#include "llurlmatch.h"
#include "lltextutil.h"
#include "lllogininstance.h"
#include "llprogressview.h"
#include "llvocache.h"
#include "lldiskcache.h"
#include "llvopartgroup.h"
#include "llweb.h"
#include "llspellcheck.h"
#include "llscenemonitor.h"
#include "llavatarrenderinfoaccountant.h"
#include "lllocalbitmaps.h"
#include "llperfstats.h"
#include "llgltfmateriallist.h"

// Linden library includes
#include "llavatarnamecache.h"
#include "lldiriterator.h"
#include "llexperiencecache.h"
#include "llimagej2c.h"
#include "llmemory.h"
#include "llprimitive.h"
#include "llurlaction.h"
#include "llurlentry.h"
#include "llvolumemgr.h"
#include "llxfermanager.h"
#include "llphysicsextensions.h"

#include "llnotificationmanager.h"
#include "llnotifications.h"
#include "llnotificationsutil.h"

#include "llleap.h"
#include "stringize.h"
#include "llcoros.h"
#include "llexception.h"
#if LL_DARWIN || LL_LINUX
#include "cef/dullahan_version.h"
#endif
#include "vlc/libvlc_version.h"

#if LL_DARWIN
#if LL_SDL
#include "llwindowsdl.h"
#else
#include "llwindowmacosx.h"
#endif // LL_SDL
#endif

// Third party library includes
#include <boost/bind.hpp>
#include <boost/algorithm/string.hpp>
#include <boost/regex.hpp>
#include <boost/throw_exception.hpp>

#if LL_WINDOWS
#   include <share.h> // For _SH_DENYWR in processMarkerFiles
#else
#   include <sys/file.h> // For processMarkerFiles
#endif

#include "llapr.h"
#include <boost/lexical_cast.hpp>

#include "llviewerinput.h"
#include "lllfsthread.h"
#include "llworkerthread.h"
#include "lltexturecache.h"
#include "lltexturefetch.h"
#include "llimageworker.h"
#include "llevents.h"

// The files below handle dependencies from cleanup.
#include "llkeyframemotion.h"
#include "llworldmap.h"
#include "llhudmanager.h"
#include "lltoolmgr.h"
#include "llassetstorage.h"
#include "llpolymesh.h"
#include "llproxy.h"
#include "llaudioengine.h"
#include "llstreamingaudio.h"
#include "llviewermenu.h"
#include "llselectmgr.h"
#include "lltrans.h"
#include "lltransutil.h"
#include "lltracker.h"
#include "llviewerparcelmgr.h"
#include "llworldmapview.h"
#include "llpostprocess.h"

#include "lldebugview.h"
#include "llconsole.h"
#include "llcontainerview.h"
#include "lltooltip.h"

#include "llsdutil.h"
#include "llsdserialize.h"

#include "llworld.h"
#include "llhudeffecttrail.h"
#include "llvectorperfoptions.h"
#include "llslurl.h"
#include "llurlregistry.h"
#include "llwatchdog.h"

// Included so that constants/settings might be initialized
// in save_settings_to_globals()
#include "llbutton.h"
#include "llstatusbar.h"
#include "llsurface.h"
#include "llvosky.h"
#include "llvotree.h"
#include "llvoavatar.h"
#include "llfolderview.h"
#include "llagentpilot.h"
#include "llvovolume.h"
#include "llflexibleobject.h"
#include "llvosurfacepatch.h"
#include "llviewerfloaterreg.h"
#include "llcommandlineparser.h"
#include "llfloatermemleak.h"
#include "llfloaterreg.h"
#include "llfloatersimplesnapshot.h"
#include "llfloatersnapshot.h"
#include "llsidepanelinventory.h"
#include "llatmosphere.h"

// includes for idle() idleShutdown()
#include "llviewercontrol.h"
#include "lleventnotifier.h"
#include "llcallbacklist.h"
#include "lldeferredsounds.h"
#include "pipeline.h"
#include "llgesturemgr.h"
#include "llsky.h"
#include "llvlcomposition.h"
#include "llvlmanager.h"
#include "llviewercamera.h"
#include "lldrawpoolbump.h"
#include "llvieweraudio.h"
#include "llimview.h"
#include "llviewerthrottle.h"
#include "llparcel.h"
#include "llavatariconctrl.h"
#include "llgroupiconctrl.h"
#include "llviewerassetstats.h"
#include "gltfscenemanager.h"

#include "workqueue.h"
using namespace LL;

// Include for security api initialization
#include "llsecapi.h"
#include "llmachineid.h"
#include "llcleanup.h"

#include "llcoproceduremanager.h"
#include "llviewereventrecorder.h"

// *FIX: These extern globals should be cleaned up.
// The globals either represent state/config/resource-storage of either
// this app, or another 'component' of the viewer. App globals should be
// moved into the app class, where as the other globals should be
// moved out of here.
// If a global symbol reference seems valid, it will be included
// via header files above.

//----------------------------------------------------------------------------
// llviewernetwork.h
#include "llviewernetwork.h"
// define a self-registering event API object
#include "llappviewerlistener.h"

#if (LL_LINUX || __FreeBSD__) && LL_GTK
#include "glib.h"
#endif // (LL_LINUX) && LL_GTK

#if LL_MSVC
// disable boost::lexical_cast warning
#pragma warning (disable:4702)
#endif

static LLAppViewerListener sAppViewerListener(LLAppViewer::instance);

////// Windows-specific includes to the bottom - nasty defines in these pollute the preprocessor
//
//----------------------------------------------------------------------------
// viewer.cpp - these are only used in viewer, should be easily moved.

#if LL_DARWIN
extern void init_apple_menu(const char* product);
#endif // LL_DARWIN

extern BOOL gRandomizeFramerate;
extern BOOL gPeriodicSlowFrame;
extern BOOL gDebugGL;

#if LL_DARWIN
extern BOOL gHiDPISupport;
#endif

////////////////////////////////////////////////////////////
// All from the last globals push...

F32 gSimLastTime; // Used in LLAppViewer::init and send_viewer_stats()
F32 gSimFrames;

BOOL gShowObjectUpdates = FALSE;
BOOL gUseQuickTime = TRUE;

eLastExecEvent gLastExecEvent = LAST_EXEC_NORMAL;
S32 gLastExecDuration = -1; // (<0 indicates unknown)

#if LL_WINDOWS
#   define LL_PLATFORM_KEY "win"
#elif LL_DARWIN
#   define LL_PLATFORM_KEY "mac"
#elif LL_LINUX
#   define LL_PLATFORM_KEY "lnx"
#elif __FreeBSD__
#   define LL_PLATFORM_KEY "bsd"
#else
#   error "Unknown Platform"
#endif
const char* gPlatform = LL_PLATFORM_KEY;

LLSD gDebugInfo;

U32 gFrameCount = 0;
U32 gForegroundFrameCount = 0; // number of frames that app window was in foreground
LLPumpIO* gServicePump = NULL;

U64MicrosecondsImplicit gFrameTime = 0;
F32SecondsImplicit gFrameTimeSeconds = 0.f;
F32SecondsImplicit gFrameIntervalSeconds = 0.f;
F32 gFPSClamped = 10.f;                     // Pretend we start at target rate.
F32 gFrameDTClamped = 0.f;                  // Time between adjacent checks to network for packets
U64MicrosecondsImplicit gStartTime = 0; // gStartTime is "private", used only to calculate gFrameTimeSeconds

LLTimer gRenderStartTime;
LLFrameTimer gForegroundTime;
LLFrameTimer gLoggedInTime;
LLTimer gLogoutTimer;
static const F32 LOGOUT_REQUEST_TIME = 6.f;  // this will be cut short by the LogoutReply msg.
F32 gLogoutMaxTime = LOGOUT_REQUEST_TIME;


S32 gPendingMetricsUploads = 0;


BOOL                gDisconnected = FALSE;

// used to restore texture state after a mode switch
LLFrameTimer    gRestoreGLTimer;
BOOL            gRestoreGL = FALSE;
bool            gUseWireframe = FALSE;

LLMemoryInfo gSysMemory;
U64Bytes gMemoryAllocated(0); // updated in display_stats() in llviewerdisplay.cpp

std::string gLastVersionChannel;

LLVector3           gWindVec(3.0, 3.0, 0.0);
LLVector3           gRelativeWindVec(0.0, 0.0, 0.0);

U32     gPacketsIn = 0;

BOOL                gPrintMessagesThisFrame = FALSE;

BOOL gRandomizeFramerate = FALSE;
BOOL gPeriodicSlowFrame = FALSE;

BOOL gCrashOnStartup = FALSE;
BOOL gLogoutInProgress = FALSE;

BOOL gSimulateMemLeak = FALSE;

// We don't want anyone, especially threads working on the graphics pipeline,
// to have to block due to this WorkQueue being full.
WorkQueue gMainloopWork("mainloop", 1024*1024);

////////////////////////////////////////////////////////////
// Internal globals... that should be removed.
static std::string gArgs;
const int MAX_MARKER_LENGTH = 1024;
const std::string MARKER_FILE_NAME("SecondLife.exec_marker");
const std::string START_MARKER_FILE_NAME("SecondLife.start_marker");
const std::string ERROR_MARKER_FILE_NAME("SecondLife.error_marker");
const std::string LLERROR_MARKER_FILE_NAME("SecondLife.llerror_marker");
const std::string LOGOUT_MARKER_FILE_NAME("SecondLife.logout_marker");
static BOOL gDoDisconnect = FALSE;
static std::string gLaunchFileOnQuit;

// Used on Win32 for other apps to identify our window (eg, win_setup)
const char* const VIEWER_WINDOW_CLASSNAME = "Second Life";

U64 fpsLimitSleepUntil = 0; // fps limiter : time until to render the frame again

//----------------------------------------------------------------------------

// List of entries from strings.xml to always replace
static std::set<std::string> default_trans_args;
void init_default_trans_args()
{
    default_trans_args.insert("SECOND_LIFE"); // World
    default_trans_args.insert("APP_NAME");
    default_trans_args.insert("CAPITALIZED_APP_NAME");
    default_trans_args.insert("SECOND_LIFE_GRID");
    default_trans_args.insert("SUPPORT_SITE");
    // This URL shows up in a surprising number of places in various skin
    // files. We really only want to have to maintain a single copy of it.
    default_trans_args.insert("create_account_url");
}

struct SettingsFile : public LLInitParam::Block<SettingsFile>
{
    Mandatory<std::string>  name;
    Optional<std::string>   file_name;
    Optional<bool>          required,
                            persistent;
    Optional<std::string>   file_name_setting;

    SettingsFile()
    :   name("name"),
        file_name("file_name"),
        required("required", false),
        persistent("persistent", true),
        file_name_setting("file_name_setting")
    {}
};

struct SettingsGroup : public LLInitParam::Block<SettingsGroup>
{
    Mandatory<std::string>  name;
    Mandatory<S32>          path_index;
    Multiple<SettingsFile>  files;

    SettingsGroup()
    :   name("name"),
        path_index("path_index"),
        files("file")
    {}
};

struct SettingsFiles : public LLInitParam::Block<SettingsFiles>
{
    Multiple<SettingsGroup> groups;

    SettingsFiles()
    : groups("group")
    {}
};

static std::string gWindowTitle;

//----------------------------------------------------------------------------
// Metrics logging control constants
//----------------------------------------------------------------------------
static const F32 METRICS_INTERVAL_DEFAULT = 600.0;
static const F32 METRICS_INTERVAL_QA = 30.0;
static F32 app_metrics_interval = METRICS_INTERVAL_DEFAULT;
static bool app_metrics_qa_mode = false;

void idle_afk_check()
{
    // check idle timers
    F32 current_idle = gAwayTriggerTimer.getElapsedTimeF32();
    F32 afk_timeout  = gSavedSettings.getS32("AFKTimeout");
    if (afk_timeout && (current_idle > afk_timeout) && ! gAgent.getAFK())
    {
        LL_INFOS("IdleAway") << "Idle more than " << afk_timeout << " seconds: automatically changing to Away status" << LL_ENDL;
        gAgent.setAFK();
    }
}

// A callback set in LLAppViewer::init()
static void ui_audio_callback(const LLUUID& uuid)
{
    if (gAudiop)
    {
        SoundData soundData(uuid, gAgent.getID(), 1.0f, LLAudioEngine::AUDIO_TYPE_UI);
        gAudiop->triggerSound(soundData);
    }
}

// A callback set in LLAppViewer::init()
static void deferred_ui_audio_callback(const LLUUID& uuid)
{
    if (gAudiop)
    {
        SoundData soundData(uuid, gAgent.getID(), 1.0f, LLAudioEngine::AUDIO_TYPE_UI);
        LLDeferredSounds::instance().deferSound(soundData);
    }
}

bool    create_text_segment_icon_from_url_match(LLUrlMatch* match,LLTextBase* base)
{
    if(!match || !base || base->getPlainText())
        return false;

    LLUUID match_id = match->getID();

    LLIconCtrl* icon;

    if( match->getMenuName() == "menu_url_group.xml" // See LLUrlEntryGroup constructor
        || gAgent.isInGroup(match_id, TRUE)) //This check seems unfiting, urls are either /agent or /group
    {
        LLGroupIconCtrl::Params icon_params;
        icon_params.group_id = match_id;
        icon_params.rect = LLRect(0, 16, 16, 0);
        icon_params.visible = true;
        icon = LLUICtrlFactory::instance().create<LLGroupIconCtrl>(icon_params);
    }
    else
    {
        LLAvatarIconCtrl::Params icon_params;
        icon_params.avatar_id = match_id;
        icon_params.rect = LLRect(0, 16, 16, 0);
        icon_params.visible = true;
        icon = LLUICtrlFactory::instance().create<LLAvatarIconCtrl>(icon_params);
    }

    LLInlineViewSegment::Params params;
    params.force_newline = false;
    params.view = icon;
    params.left_pad = 4;
    params.right_pad = 4;
    params.top_pad = -2;
    params.bottom_pad = 2;

    base->appendWidget(params," ",false);

    return true;
}

// Use these strictly for things that are constructed at startup,
// or for things that are performance critical.  JC
static void settings_to_globals()
{
    LLSurface::setTextureSize(gSavedSettings.getU32("RegionTextureSize"));

//#if LL_DARWIN
    LLRender::sGLCoreProfile = true;
/*
#else
    LLRender::sGLCoreProfile = gSavedSettings.getBOOL("RenderGLContextCoreProfile");
#endif
*/
    LLRender::sNsightDebugSupport = gSavedSettings.getBOOL("RenderNsightDebugSupport");
    LLImageGL::sGlobalUseAnisotropic    = gSavedSettings.getBOOL("RenderAnisotropic");
    LLImageGL::sCompressTextures        = gSavedSettings.getBOOL("RenderCompressTextures");
    LLVOVolume::sLODFactor              = llclamp(gSavedSettings.getF32("RenderVolumeLODFactor"), 0.01f, MAX_LOD_FACTOR);
    LLVOVolume::sDistanceFactor         = 1.f-LLVOVolume::sLODFactor * 0.1f;
    LLVolumeImplFlexible::sUpdateFactor = gSavedSettings.getF32("RenderFlexTimeFactor");
    LLVOTree::sTreeFactor               = gSavedSettings.getF32("RenderTreeLODFactor");
    LLVOAvatar::sLODFactor              = llclamp(gSavedSettings.getF32("RenderAvatarLODFactor"), 0.f, MAX_AVATAR_LOD_FACTOR);
    LLVOAvatar::sPhysicsLODFactor       = llclamp(gSavedSettings.getF32("RenderAvatarPhysicsLODFactor"), 0.f, MAX_AVATAR_LOD_FACTOR);
    LLVOAvatar::updateImpostorRendering(gSavedSettings.getU32("RenderAvatarMaxNonImpostors"));
    LLVOAvatar::sVisibleInFirstPerson   = gSavedSettings.getBOOL("FirstPersonAvatarVisible");
    // clamp auto-open time to some minimum usable value
    LLFolderView::sAutoOpenTime         = llmax(0.25f, gSavedSettings.getF32("FolderAutoOpenDelay"));
    LLSelectMgr::sRectSelectInclusive   = gSavedSettings.getBOOL("RectangleSelectInclusive");
    LLSelectMgr::sRenderHiddenSelections = gSavedSettings.getBOOL("RenderHiddenSelections");
    LLSelectMgr::sRenderLightRadius = gSavedSettings.getBOOL("RenderLightRadius");

    gAgentPilot.setNumRuns(gSavedSettings.getS32("StatsNumRuns"));
    gAgentPilot.setQuitAfterRuns(gSavedSettings.getBOOL("StatsQuitAfterRuns"));
    gAgent.setHideGroupTitle(gSavedSettings.getBOOL("RenderHideGroupTitle"));

    gDebugWindowProc = gSavedSettings.getBOOL("DebugWindowProc");
    gShowObjectUpdates = gSavedSettings.getBOOL("ShowObjectUpdates");
    LLWorldMapView::setScaleSetting(gSavedSettings.getF32("MapScale"));

#if LL_DARWIN
#if LL_SDL
    LLWindowSDL::sUseMultGL = gSavedSettings.getBOOL("RenderAppleUseMultGL");
#else
    LLWindowMacOSX::sUseMultGL = gSavedSettings.getBOOL("RenderAppleUseMultGL");
#endif // LL_SDL
    gHiDPISupport = gSavedSettings.getBOOL("RenderHiDPI");
#endif
}

static void settings_modify()
{
    LLPipeline::sRenderTransparentWater = gSavedSettings.getBOOL("RenderTransparentWater");
    LLPipeline::sRenderDeferred = TRUE; // FALSE is deprecated
    LLRenderTarget::sUseFBO             = LLPipeline::sRenderDeferred;
    LLVOSurfacePatch::sLODFactor        = gSavedSettings.getF32("RenderTerrainLODFactor");
    LLVOSurfacePatch::sLODFactor *= LLVOSurfacePatch::sLODFactor; //square lod factor to get exponential range of [1,4]
    gDebugGL       = gDebugGLSession || gDebugSession;
    gDebugPipeline = gSavedSettings.getBOOL("RenderDebugPipeline");
}

class LLFastTimerLogThread : public LLThread
{
public:
    std::string mFile;

    LLFastTimerLogThread(std::string& test_name) : LLThread("fast timer log")
    {
        std::string file_name = test_name + std::string(".slp");
        mFile = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, file_name);
    }

    void run()
    {
        llofstream os(mFile.c_str());

        while (!LLAppViewer::instance()->isQuitting())
        {
            LLTrace::BlockTimer::writeLog(os);
            os.flush();
            ms_sleep(32);
        }

        os.close();
    }
};

//virtual
bool LLAppViewer::initSLURLHandler()
{
    // does nothing unless subclassed
    return false;
}

//virtual
bool LLAppViewer::sendURLToOtherInstance(const std::string& url)
{
    // does nothing unless subclassed
    return false;
}

//----------------------------------------------------------------------------
// LLAppViewer definition

// Static members.
// The single viewer app.
LLAppViewer* LLAppViewer::sInstance = NULL;
LLTextureCache* LLAppViewer::sTextureCache = NULL;
LLImageDecodeThread* LLAppViewer::sImageDecodeThread = NULL;
LLTextureFetch* LLAppViewer::sTextureFetch = NULL;
LLPurgeDiskCacheThread* LLAppViewer::sPurgeDiskCacheThread = NULL;

std::string getRuntime()
{
    return llformat("%.4f", (F32)LLTimer::getElapsedSeconds().value());
}

LLAppViewer::LLAppViewer()
:   mMarkerFile(),
    mLogoutMarkerFile(),
    mReportedCrash(false),
    mNumSessions(0),
    mGeneralThreadPool(nullptr),
    mPurgeCache(false),
    mPurgeCacheOnExit(false),
    mPurgeUserDataOnExit(false),
    mSecondInstance(false),
    mUpdaterNotFound(false),
    mSavedFinalSnapshot(false),
    mSavePerAccountSettings(false),     // don't save settings on logout unless login succeeded.
    mQuitRequested(false),
    mLogoutRequestSent(false),
    mLastAgentControlFlags(0),
    mLastAgentForceUpdate(0),
    mMainloopTimeout(NULL),
    mAgentRegionLastAlive(false),
    mRandomizeFramerate(LLCachedControl<bool>(gSavedSettings,"Randomize Framerate", FALSE)),
    mPeriodicSlowFrame(LLCachedControl<bool>(gSavedSettings,"Periodic Slow Frame", FALSE)),
    mFastTimerLogThread(NULL),
    mSettingsLocationList(NULL),
    mIsFirstRun(false)
{
    if(NULL != sInstance)
    {
        LL_ERRS() << "Oh no! An instance of LLAppViewer already exists! LLAppViewer is sort of like a singleton." << LL_ENDL;
    }

    mDumpPath ="";

    // Need to do this initialization before we do anything else, since anything
    // that touches files should really go through the lldir API
    gDirUtilp->initAppDirs("Megapahit");
    //
    // IMPORTANT! Do NOT put anything that will write
    // into the log files during normal startup until AFTER
    // we run the "program crashed last time" error handler below.
    //
    sInstance = this;

    gLoggedInTime.stop();

    processMarkerFiles();
    //
    // OK to write stuff to logs now, we've now crash reported if necessary
    //

    LLLoginInstance::instance().setPlatformInfo(gPlatform, LLOSInfo::instance().getOSVersionString(), LLOSInfo::instance().getOSStringSimple());

    // Under some circumstances we want to read the static_debug_info.log file
    // from the previous viewer run between this constructor call and the
    // init() call, which will overwrite the static_debug_info.log file for
    // THIS run. So setDebugFileNames() early.
#   ifdef LL_BUGSPLAT
    // MAINT-8917: don't create a dump directory just for the
    // static_debug_info.log file
    std::string logdir = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, "");
#   else // ! LL_BUGSPLAT
    // write Google Breakpad minidump files to a per-run dump directory to avoid multiple viewer issues.
    std::string logdir = gDirUtilp->getExpandedFilename(LL_PATH_DUMP, "");
#   endif // ! LL_BUGSPLAT
    mDumpPath = logdir;

    setDebugFileNames(logdir);
}

LLAppViewer::~LLAppViewer()
{
    delete mSettingsLocationList;

    destroyMainloopTimeout();

    // If we got to this destructor somehow, the app didn't hang.
    removeMarkerFiles();
}

class LLUITranslationBridge : public LLTranslationBridge
{
public:
    virtual std::string getString(const std::string &xml_desc)
    {
        return LLTrans::getString(xml_desc);
    }
};


bool LLAppViewer::init()
{
    setupErrorHandling(mSecondInstance);

    //
    // Start of the application
    //

    // initialize the LLSettingsType translation bridge.
    LLTranslationBridge::ptr_t trans = std::make_shared<LLUITranslationBridge>();
    LLSettingsType::initParamSingleton(trans);

    // initialize SSE options
    LLVector4a::initClass();

    //initialize particle index pool
    LLVOPartGroup::initClass();

    // set skin search path to default, will be overridden later
    // this allows simple skinned file lookups to work
    gDirUtilp->setSkinFolder("default", "en");

//  initLoggingAndGetLastDuration();

    //
    // OK to write stuff to logs now, we've now crash reported if necessary
    //
    init_default_trans_args();

    // inits from settings.xml and from strings.xml
    if (!initConfiguration())
        return false;

    LL_INFOS("InitInfo") << "Configuration initialized." << LL_ENDL ;

    //set the max heap size.
    initMaxHeapSize() ;
    LLCoros::instance().setStackSize(gSavedSettings.getS32("CoroutineStackSize"));


    // Although initLoggingAndGetLastDuration() is the right place to mess with
    // setFatalFunction(), we can't query gSavedSettings until after
    // initConfiguration().
    S32 rc(gSavedSettings.getS32("QAModeTermCode"));
    if (rc >= 0)
    {
        // QAModeTermCode set, terminate with that rc on LL_ERRS. Use
        // _exit() rather than exit() because normal cleanup depends too
        // much on successful startup!
        LLError::setFatalFunction([rc](const std::string&){ _exit(rc); });
    }

    mAlloc.setProfilingEnabled(gSavedSettings.getBOOL("MemProfiling"));

    // Initialize the non-LLCurl libcurl library.  Should be called
    // before consumers (LLTextureFetch).
    mAppCoreHttp.init();

    LL_INFOS("InitInfo") << "LLCore::Http initialized." << LL_ENDL ;

    LLMachineID::init();

    {
        if (gSavedSettings.getBOOL("QAModeMetrics"))
        {
            app_metrics_qa_mode = true;
            app_metrics_interval = METRICS_INTERVAL_QA;
        }
        LLViewerAssetStatsFF::init();
    }

    initThreads();
    LL_INFOS("InitInfo") << "Threads initialized." << LL_ENDL ;

    // Initialize settings early so that the defaults for ignorable dialogs are
    // picked up and then correctly re-saved after launching the updater (STORM-1268).
    LLUI::settings_map_t settings_map;
    settings_map["config"] = &gSavedSettings;
    settings_map["ignores"] = &gWarningSettings;
    settings_map["floater"] = &gSavedSettings; // *TODO: New settings file
    settings_map["account"] = &gSavedPerAccountSettings;

    LLUI::initParamSingleton(settings_map,
        LLUIImageList::getInstance(),
        ui_audio_callback,
        deferred_ui_audio_callback);
    LL_INFOS("InitInfo") << "UI initialized." << LL_ENDL ;

    // NOW LLUI::getLanguage() should work. gDirUtilp must know the language
    // for this session ASAP so all the file-loading commands that follow,
    // that use findSkinnedFilenames(), will include the localized files.
    gDirUtilp->setSkinFolder(gDirUtilp->getSkinFolder(), LLUI::getLanguage());

    // Setup LLTrans after LLUI::initClass has been called.
    initStrings();

    // initialize LLWearableType translation bridge.
    // Will immediately use LLTranslationBridge to init LLWearableDictionary
    LLWearableType::initParamSingleton(trans);

    // Setup notifications after LLUI::initClass() has been called.
    LLNotifications::instance();
    LL_INFOS("InitInfo") << "Notifications initialized." << LL_ENDL ;

    //////////////////////////////////////////////////////////////////////////////
    //////////////////////////////////////////////////////////////////////////////
    //////////////////////////////////////////////////////////////////////////////
    //////////////////////////////////////////////////////////////////////////////
    // *FIX: The following code isn't grouped into functions yet.

    //
    // Various introspection concerning the libs we're using - particularly
    // the libs involved in getting to a full login screen.
    //
    LL_INFOS("InitInfo") << "J2C Engine is: " << LLImageJ2C::getEngineInfo() << LL_ENDL;
    LL_INFOS("InitInfo") << "libcurl version is: " << LLCore::LLHttp::getCURLVersion() << LL_ENDL;

    /////////////////////////////////////////////////
    // OS-specific login dialogs
    /////////////////////////////////////////////////

    //test_cached_control();

    // track number of times that app has run
    mNumSessions = gSavedSettings.getS32("NumSessions");
    mNumSessions++;
    gSavedSettings.setS32("NumSessions", mNumSessions);

    // LLKeyboard relies on LLUI to know what some accelerator keys are called.
    LLKeyboard::setStringTranslatorFunc( LLTrans::getKeyboardString );

    // Provide the text fields with callbacks for opening Urls
    LLUrlAction::setOpenURLCallback(boost::bind(&LLWeb::loadURL, _1, LLStringUtil::null, LLStringUtil::null));
    LLUrlAction::setOpenURLInternalCallback(boost::bind(&LLWeb::loadURLInternal, _1, LLStringUtil::null, LLStringUtil::null, false));
    LLUrlAction::setOpenURLExternalCallback(boost::bind(&LLWeb::loadURLExternal, _1, true, LLStringUtil::null));
    LLUrlAction::setExecuteSLURLCallback(&LLURLDispatcher::dispatchFromTextEditor);

    // Let code in llui access the viewer help floater
    LLUI::getInstance()->mHelpImpl = LLViewerHelp::getInstance();

    LL_INFOS("InitInfo") << "UI initialization is done." << LL_ENDL ;

    // Load translations for tooltips
    LLFloater::initClass();
    LLUrlFloaterDispatchHandler::registerInDispatcher();

    /////////////////////////////////////////////////

    LLToolMgr::getInstance(); // Initialize tool manager if not already instantiated

    LLViewerFloaterReg::registerFloaters();

    /////////////////////////////////////////////////
    //
    // Load settings files
    //
    //
    LLGroupMgr::parseRoleActions("role_actions.xml");

    LLAgent::parseTeleportMessages("teleport_strings.xml");

    // load MIME type -> media impl mappings
    std::string mime_types_name;
#if LL_DARWIN
    mime_types_name = "mime_types_mac.xml";
#elif LL_LINUX || __FreeBSD__
    mime_types_name = "mime_types_linux.xml";
#else
    mime_types_name = "mime_types.xml";
#endif
    LLMIMETypes::parseMIMETypes( mime_types_name );

    // Copy settings to globals. *TODO: Remove or move to appropriage class initializers
    settings_to_globals();
    // Setup settings listeners
    settings_setup_listeners();
    // Modify settings based on system configuration and compile options
    settings_modify();

    // Find partition serial number (Windows) or hardware serial (Mac)
    mSerialNumber = generateSerialNumber();

    // do any necessary set-up for accepting incoming SLURLs from apps
    initSLURLHandler();

    if(false == initHardwareTest())
    {
        // Early out from user choice.
        return false;
    }
    LL_INFOS("InitInfo") << "Hardware test initialization done." << LL_ENDL ;

    // Prepare for out-of-memory situations, during which we will crash on
    // purpose and save a dump.
#if LL_WINDOWS && LL_RELEASE_FOR_DOWNLOAD && LL_USE_SMARTHEAP
    MemSetErrorHandler(first_mem_error_handler);
#endif // LL_WINDOWS && LL_RELEASE_FOR_DOWNLOAD && LL_USE_SMARTHEAP

    // *Note: this is where gViewerStats used to be created.

    if (!initCache())
    {
        LL_WARNS("InitInfo") << "Failed to init cache" << LL_ENDL;
        std::ostringstream msg;
        msg << LLTrans::getString("MBUnableToAccessFile");
        OSMessageBox(msg.str(),LLStringUtil::null,OSMB_OK);
        return 0;
    }
    LL_INFOS("InitInfo") << "Cache initialization is done." << LL_ENDL ;

    // Initialize event recorder
    LLViewerEventRecorder::createInstance();

    //
    // Initialize the window
    //
    gGLActive = TRUE;
    initWindow();
    LL_INFOS("InitInfo") << "Window is initialized." << LL_ENDL ;

    // writeSystemInfo can be called after window is initialized (gViewerWindow non-null)
    writeSystemInfo();

    // initWindow also initializes the Feature List, so now we can initialize this global.
    LLCubeMap::sUseCubeMaps = LLFeatureManager::getInstance()->isFeatureAvailable("RenderCubeMap");

    // call all self-registered classes
    LLInitClassList::instance().fireCallbacks();

    LLFolderViewItem::initClass(); // SJB: Needs to happen after initWindow(), not sure why but related to fonts

    gGLManager.getGLInfo(gDebugInfo);
    gGLManager.printGLInfoString();

    // If we don't have the right GL requirements, exit.
    if (!gGLManager.mHasRequirements)
    {
        // already handled with a MBVideoDrvErr
        return 0;
    }

#if defined(__i386__) || defined(__x86_64__) || defined(__amd64__)
    // Without SSE2 support we will crash almost immediately, warn here.
    if (!gSysCPU.hasSSE2())
    {
        // can't use an alert here since we're exiting and
        // all hell breaks lose.
        OSMessageBox(
            LLNotifications::instance().getGlobalString("UnsupportedCPUSSE2"),
            LLStringUtil::null,
            OSMB_OK);
        return 0;
    }
#endif

    // alert the user if they are using unsupported hardware
    if(!gSavedSettings.getBOOL("AlertedUnsupportedHardware"))
    {
        bool unsupported = false;
        LLSD args;
        std::string minSpecs;

        // get cpu data from xml
        std::stringstream minCPUString(LLNotifications::instance().getGlobalString("UnsupportedCPUAmount"));
        S32 minCPU = 0;
        minCPUString >> minCPU;

        // get RAM data from XML
        std::stringstream minRAMString(LLNotifications::instance().getGlobalString("UnsupportedRAMAmount"));
        U64Bytes minRAM;
        minRAMString >> minRAM;

        if(!LLFeatureManager::getInstance()->isGPUSupported() && LLFeatureManager::getInstance()->getGPUClass() != GPU_CLASS_UNKNOWN)
        {
            minSpecs += LLNotifications::instance().getGlobalString("UnsupportedGPU");
            minSpecs += "\n";
            unsupported = true;
        }
        if(gSysCPU.getMHz() < minCPU)
        {
            minSpecs += LLNotifications::instance().getGlobalString("UnsupportedCPU");
            minSpecs += "\n";
            unsupported = true;
        }
        if(gSysMemory.getPhysicalMemoryKB() < minRAM)
        {
            minSpecs += LLNotifications::instance().getGlobalString("UnsupportedRAM");
            minSpecs += "\n";
            unsupported = true;
        }

        if (LLFeatureManager::getInstance()->getGPUClass() == GPU_CLASS_UNKNOWN)
        {
            LLNotificationsUtil::add("UnknownGPU");
        }

        if(unsupported)
        {
            if(!gSavedSettings.controlExists("WarnUnsupportedHardware")
                || gSavedSettings.getBOOL("WarnUnsupportedHardware"))
            {
                args["MINSPECS"] = minSpecs;
                LLNotificationsUtil::add("UnsupportedHardware", args );
            }

        }
    }

#if LL_WINDOWS && ADDRESS_SIZE == 64
    if (gGLManager.mIsIntel)
    {
        // Check intel driver's version
        // Ex: "3.1.0 - Build 8.15.10.2559";
        std::string version = ll_safe_string((const char *)glGetString(GL_VERSION));

        const boost::regex is_intel_string("[0-9].[0-9].[0-9] - Build [0-9]{1,2}.[0-9]{2}.[0-9]{2}.[0-9]{4}");

        if (boost::regex_search(version, is_intel_string))
        {
            // Valid string, extract driver version
            std::size_t found = version.find("Build ");
            std::string driver = version.substr(found + 6);
            S32 v1, v2, v3, v4;
            S32 count = sscanf(driver.c_str(), "%d.%d.%d.%d", &v1, &v2, &v3, &v4);
            if (count > 0 && v1 <= 10)
            {
                LL_INFOS("AppInit") << "Detected obsolete intel driver: " << driver << LL_ENDL;

                if (!gViewerWindow->getInitAlert().empty() // graphic initialization crashed on last run
                    || LLVersionInfo::getInstance()->getChannelAndVersion() != gLastRunVersion // viewer was updated
                    || mNumSessions % 20 == 0 //periodically remind user to update driver
                    )
                {
                    LLUIString details = LLNotifications::instance().getGlobalString("UnsupportedIntelDriver");
                    std::string gpu_name = ll_safe_string((const char *)glGetString(GL_RENDERER));
                    LL_INFOS("AppInit") << "Notifying user about obsolete intel driver for " << gpu_name << LL_ENDL;
                    details.setArg("[VERSION]", driver);
                    details.setArg("[GPUNAME]", gpu_name);
                    S32 button = OSMessageBox(details.getString(),
                        LLStringUtil::null,
                        OSMB_YESNO);
                    if (OSBTN_YES == button && gViewerWindow)
                    {
                        std::string url = LLWeb::escapeURL(LLTrans::getString("IntelDriverPage"));
                        if (gViewerWindow->getWindow())
                        {
                            gViewerWindow->getWindow()->spawnWebBrowser(url, false);
                        }
                    }
                }
            }
        }
    }
#endif

    // Obsolete? mExpectedGLVersion is always zero
#if LL_WINDOWS
    if (gGLManager.mGLVersion < LLFeatureManager::getInstance()->getExpectedGLVersion())
    {
        std::string url;
        if (gGLManager.mIsIntel)
        {
            url = LLTrans::getString("IntelDriverPage");
        }
        else if (gGLManager.mIsNVIDIA)
        {
            url = LLTrans::getString("NvidiaDriverPage");
        }
        else if (gGLManager.mIsAMD)
        {
            url = LLTrans::getString("AMDDriverPage");
        }

        if (!url.empty())
        {
            LLNotificationsUtil::add("OldGPUDriver", LLSD().with("URL", url));
        }
    }
#endif


    // save the graphics card
    gDebugInfo["GraphicsCard"] = LLFeatureManager::getInstance()->getGPUString();

    // Save the current version to the prefs file
    gSavedSettings.setString("LastRunVersion",
                             LLVersionInfo::instance().getChannelAndVersion());

    gSimLastTime = gRenderStartTime.getElapsedTimeF32();
    gSimFrames = (F32)gFrameCount;

    if (gSavedSettings.getBOOL("JoystickEnabled"))
    {
        LLViewerJoystick::getInstance()->init(false);
    }

    try {
        initializeSecHandler();
    }
    catch (LLProtectedDataException&)
    {
      LLNotificationsUtil::add("CorruptedProtectedDataStore");
    }

    gGLActive = FALSE;

#if 0 // LL_RELEASE_FOR_DOWNLOAD
    // Skip updater if this is a non-interactive instance
    if (!gSavedSettings.getBOOL("CmdLineSkipUpdater") && !gNonInteractive)
    {
        LLProcess::Params updater;
        updater.desc = "updater process";
        // Because it's the updater, it MUST persist beyond the lifespan of the
        // viewer itself.
        updater.autokill = false;
        std::string updater_file;
#if LL_WINDOWS
        updater_file = "SLVersionChecker.exe";
        updater.executable = gDirUtilp->getExpandedFilename(LL_PATH_EXECUTABLE, updater_file);
#elif LL_DARWIN
        updater_file = "SLVersionChecker";
        updater.executable = gDirUtilp->add(gDirUtilp->getAppRODataDir(), "updater", updater_file);
#else
        updater_file = "SLVersionChecker";
        updater.executable = gDirUtilp->getExpandedFilename(LL_PATH_EXECUTABLE, updater_file);
#endif
        // add LEAP mode command-line argument to whichever of these we selected
        updater.args.add("leap");
        // UpdaterServiceSettings
        if (gSavedSettings.getBOOL("FirstLoginThisInstall"))
        {
            // Befor first login, treat this as 'manual' updates,
            // updater won't install anything, but required updates
            updater.args.add("0");
        }
        else
        {
            updater.args.add(stringize(gSavedSettings.getU32("UpdaterServiceSetting")));
        }
        // channel
        updater.args.add(LLVersionInfo::instance().getChannel());
        // testok
        updater.args.add(stringize(gSavedSettings.getBOOL("UpdaterWillingToTest")));
        // ForceAddressSize
        updater.args.add(stringize(gSavedSettings.getU32("ForceAddressSize")));

        try
        {
            // Run the updater. An exception from launching the updater should bother us.
            LLLeap::create(updater, true);
            mUpdaterNotFound = false;
        }
        catch (...)
        {
            LLUIString details = LLNotifications::instance().getGlobalString("LLLeapUpdaterFailure");
            details.setArg("[UPDATER_APP]", updater_file);
            OSMessageBox(
                details.getString(),
                LLStringUtil::null,
                OSMB_OK);
            mUpdaterNotFound = true;
        }
    }
    else
    {
        LL_WARNS("InitInfo") << "Skipping updater check." << LL_ENDL;
    }
#endif //LL_RELEASE_FOR_DOWNLOAD

    {
        // Iterate over --leap command-line options. But this is a bit tricky: if
        // there's only one, it won't be an array at all.
        LLSD LeapCommand(gSavedSettings.getLLSD("LeapCommand"));
        LL_DEBUGS("InitInfo") << "LeapCommand: " << LeapCommand << LL_ENDL;
        if (LeapCommand.isDefined() && !LeapCommand.isArray())
        {
            // If LeapCommand is actually a scalar value, make an array of it.
            // Have to do it in two steps because LeapCommand.append(LeapCommand)
            // trashes content! :-P
            LLSD item(LeapCommand);
            LeapCommand.append(item);
        }
        for (const auto& leap : llsd::inArray(LeapCommand))
        {
            LL_INFOS("InitInfo") << "processing --leap \"" << leap << '"' << LL_ENDL;
            // We don't have any better description of this plugin than the
            // user-specified command line. Passing "" causes LLLeap to derive a
            // description from the command line itself.
            // Suppress LLLeap::Error exception: trust LLLeap's own logging. We
            // don't consider any one --leap command mission-critical, so if one
            // fails, log it, shrug and carry on.
            LLLeap::create("", leap, false); // exception=false
        }
    }

    if (gSavedSettings.getBOOL("QAMode") && gSavedSettings.getS32("QAModeEventHostPort") > 0)
    {
        LL_WARNS("InitInfo") << "QAModeEventHostPort DEPRECATED: "
                             << "lleventhost no longer supported as a dynamic library"
                             << LL_ENDL;
    }

    LLTextUtil::TextHelpers::iconCallbackCreationFunction = create_text_segment_icon_from_url_match;

    //EXT-7013 - On windows for some locale (Japanese) standard
    //datetime formatting functions didn't support some parameters such as "weekday".
    //Names for days and months localized in xml are also useful for Polish locale(STORM-107).
    std::string language = gSavedSettings.getString("Language");
    if(language == "ja" || language == "pl")
    {
        LLStringOps::setupWeekDaysNames(LLTrans::getString("dateTimeWeekdaysNames"));
        LLStringOps::setupWeekDaysShortNames(LLTrans::getString("dateTimeWeekdaysShortNames"));
        LLStringOps::setupMonthNames(LLTrans::getString("dateTimeMonthNames"));
        LLStringOps::setupMonthShortNames(LLTrans::getString("dateTimeMonthShortNames"));
        LLStringOps::setupDayFormat(LLTrans::getString("dateTimeDayFormat"));

        LLStringOps::sAM = LLTrans::getString("dateTimeAM");
        LLStringOps::sPM = LLTrans::getString("dateTimePM");
    }

    LLAgentLanguage::init();

    /// Tell the Coprocedure manager how to discover and store the pool sizes
    // what I wanted
    LLCoprocedureManager::getInstance()->setPropertyMethods(
        boost::bind(&LLControlGroup::getU32, boost::ref(gSavedSettings), _1),
        boost::bind(&LLControlGroup::declareU32, boost::ref(gSavedSettings), _1, _2, _3, LLControlVariable::PERSIST_ALWAYS));

    // TODO: consider moving proxy initialization here or LLCopocedureManager after proxy initialization, may be implement
    // some other protection to make sure we don't use network before initializng proxy

    /*----------------------------------------------------------------------*/
    // nat 2016-06-29 moved the following here from the former mainLoop().
    mMainloopTimeout = new LLWatchdogTimeout();

    // Create IO Pump to use for HTTP Requests.
    gServicePump = new LLPumpIO(gAPRPoolp);

    // Note: this is where gLocalSpeakerMgr and gActiveSpeakerMgr used to be instantiated.

    LLVoiceChannel::initClass();
    LLVoiceClient::initParamSingleton(gServicePump);
    LLVoiceChannel::setCurrentVoiceChannelChangedCallback(boost::bind(&LLFloaterIMContainer::onCurrentChannelChanged, _1), true);

    joystick = LLViewerJoystick::getInstance();
    joystick->setNeedsReset(true);
    /*----------------------------------------------------------------------*/
    // Load User's bindings
    loadKeyBindings();

    //LLSimpleton creations
    LLEnvironment::createInstance();
    LLWorld::createInstance();
    LLSelectMgr::createInstance();
    LLViewerCamera::createInstance();
    LL::GLTFSceneManager::createInstance();


#if LL_WINDOWS
    if (!mSecondInstance)
    {
        gDirUtilp->deleteDirAndContents(gDirUtilp->getDumpLogsDirPath());
    }
#endif

    return true;
}

void LLAppViewer::initMaxHeapSize()
{
    //set the max heap size.
    //here is some info regarding to the max heap size:
    //------------------------------------------------------------------------------------------
    // OS       | setting | SL address bits | max manageable memory space | max heap size
    // Win 32   | default | 32-bit          | 2GB                         | < 1.7GB
    // Win 32   | /3G     | 32-bit          | 3GB                         | < 1.7GB or 2.7GB
    //Linux 32  | default | 32-bit          | 3GB                         | < 2.7GB
    //Linux 32  |HUGEMEM  | 32-bit          | 4GB                         | < 3.7GB
    //64-bit OS |default  | 32-bit          | 4GB                         | < 3.7GB
    //64-bit OS |default  | 64-bit          | N/A (> 4GB)                 | N/A (> 4GB)
    //------------------------------------------------------------------------------------------
    //currently SL is built under 32-bit setting, we set its max heap size no more than 1.6 GB.

 #ifndef LL_X86_64
    F32Gigabytes max_heap_size_gb = (F32Gigabytes)gSavedSettings.getF32("MaxHeapSize") ;
#else
    F32Gigabytes max_heap_size_gb = (F32Gigabytes)gSavedSettings.getF32("MaxHeapSize64");
#endif

    LLMemory::initMaxHeapSizeGB(max_heap_size_gb);
}


// externally visible timers
LLTrace::BlockTimerStatHandle FTM_FRAME("Frame");

bool LLAppViewer::frame()
{
    bool ret = false;

    if (gSimulateMemLeak)
    {
        try
        {
            ret = doFrame();
        }
        catch (const LLContinueError&)
        {
            LOG_UNHANDLED_EXCEPTION("");
        }
        catch (std::bad_alloc&)
        {
            LLMemory::logMemoryInfo(TRUE);
            LLFloaterMemLeak* mem_leak_instance = LLFloaterReg::findTypedInstance<LLFloaterMemLeak>("mem_leaking");
            if (mem_leak_instance)
            {
                mem_leak_instance->stop();
            }
            LL_WARNS() << "Bad memory allocation in LLAppViewer::frame()!" << LL_ENDL;
        }
    }
    else
    {
        try
        {
            ret = doFrame();
        }
        catch (const LLContinueError&)
        {
            LOG_UNHANDLED_EXCEPTION("");
        }
    }

    return ret;
}

bool LLAppViewer::doFrame()
{

    // FPS Limit

    U64 fpsLimitNow = LLTrace::BlockTimer::getCPUClockCount64();
    U64 fpsLimitFrameStartTime = fpsLimitNow;
    if(fpsLimitSleepUntil > 0)
    {
        if(fpsLimitSleepUntil > fpsLimitNow) return 0;
    }
    else
    {
        fpsLimitSleepUntil = 0;
    }



    LL_RECORD_BLOCK_TIME(FTM_FRAME);
    {
    // and now adjust the visuals from previous frame.
    if(LLPerfStats::tunables.userAutoTuneEnabled && LLPerfStats::tunables.tuningFlag != LLPerfStats::Tunables::Nothing)
    {
        LLPerfStats::tunables.applyUpdates();
    }

    LLPerfStats::RecordSceneTime T (LLPerfStats::StatType_t::RENDER_FRAME);
    if (!LLWorld::instanceExists())
    {
        LLWorld::createInstance();
    }

    LLEventPump& mainloop(LLEventPumps::instance().obtain("mainloop"));
    LLSD newFrame;
    {
        LLPerfStats::RecordSceneTime T (LLPerfStats::StatType_t::RENDER_IDLE); // perf stats
        {
            LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df LLTrace");
            if (LLFloaterReg::instanceVisible("block_timers"))
            {
                LLTrace::BlockTimer::processTimes();
            }

            LLTrace::get_frame_recording().nextPeriod();
            LLTrace::BlockTimer::logStats();
        }

        LLTrace::get_thread_recorder()->pullFromChildren();

        //clear call stack records
        LL_CLEAR_CALLSTACKS();
    }
    {
        {
            LLPerfStats::RecordSceneTime T(LLPerfStats::StatType_t::RENDER_IDLE); // ensure we have the entire top scope of frame covered (input event and coro)
            LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df processMiscNativeEvents")
            pingMainloopTimeout("Main:MiscNativeWindowEvents");

            if (gViewerWindow)
            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP("System Messages");
                gViewerWindow->getWindow()->processMiscNativeEvents();
            }

            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df gatherInput")
                pingMainloopTimeout("Main:GatherInput");
            }

            if (gViewerWindow)
            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP("System Messages");
                if (!restoreErrorTrap())
                {
                    LL_WARNS() << " Someone took over my signal/exception handler (post messagehandling)!" << LL_ENDL;
                }

                gViewerWindow->getWindow()->gatherInput();
            }

            //memory leaking simulation
            if (gSimulateMemLeak)
            {
                LLFloaterMemLeak* mem_leak_instance =
                    LLFloaterReg::findTypedInstance<LLFloaterMemLeak>("mem_leaking");
                if (mem_leak_instance)
                {
                    mem_leak_instance->idle();
                }
            }

            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df mainloop")
                // canonical per-frame event
                mainloop.post(newFrame);
            }

            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df suspend")
                // give listeners a chance to run
                llcoro::suspend();
                // if one of our coroutines threw an uncaught exception, rethrow it now
                LLCoros::instance().rethrow();
            }
        }

        if (!LLApp::isExiting())
        {
            LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df JoystickKeyboard" )
            pingMainloopTimeout("Main:JoystickKeyboard");

            // Scan keyboard for movement keys.  Command keys and typing
            // are handled by windows callbacks.  Don't do this until we're
            // done initializing.  JC
            if (gViewerWindow
                && (gHeadlessClient || gViewerWindow->getWindow()->getVisible())
                && gViewerWindow->getActive()
                && !gViewerWindow->getWindow()->getMinimized()
                && LLStartUp::getStartupState() == STATE_STARTED
                && (gHeadlessClient || !gViewerWindow->getShowProgress())
                && !gFocusMgr.focusLocked())
            {
                LLPerfStats::RecordSceneTime T (LLPerfStats::StatType_t::RENDER_IDLE);
                joystick->scanJoystick();
                gKeyboard->scanKeyboard();
                gViewerInput.scanMouse();
            }

            // Update state based on messages, user input, object idle.
            {
                {
                    LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df pauseMainloopTimeout" )
                    pauseMainloopTimeout(); // *TODO: Remove. Messages shouldn't be stalling for 20+ seconds!
                }

                {
                    LLPerfStats::RecordSceneTime T (LLPerfStats::StatType_t::RENDER_IDLE);
                    LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df idle");
                    idle();
                }

                {
                    LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df resumeMainloopTimeout" )
                    resumeMainloopTimeout();
                }
            }

            if (gDoDisconnect && (LLStartUp::getStartupState() == STATE_STARTED))
            {
                pauseMainloopTimeout();
                saveFinalSnapshot();

                if (LLVoiceClient::instanceExists())
                {
                    LLVoiceClient::getInstance()->terminate();
                }

                disconnectViewer();
                resumeMainloopTimeout();
            }

            // Render scene.
            // *TODO: Should we run display() even during gHeadlessClient?  DK 2011-02-18
            if (!LLApp::isExiting() && !gHeadlessClient && gViewerWindow)
            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df Display");
                pingMainloopTimeout("Main:Display");
                gGLActive = TRUE;

                display();

                {
                    LLPerfStats::RecordSceneTime T(LLPerfStats::StatType_t::RENDER_IDLE);
                    LL_PROFILE_ZONE_NAMED_CATEGORY_APP("df Snapshot");
                    pingMainloopTimeout("Main:Snapshot");
                    gPipeline.mReflectionMapManager.update();
                    LLFloaterSnapshot::update(); // take snapshots
                    LLFloaterSimpleSnapshot::update();
                    gGLActive = FALSE;
                }

                if (LLViewerStatsRecorder::instanceExists())
                {
                    LLViewerStatsRecorder::instance().idle();
                }
            }
        }

        // fps limiter

        fpsLimitNow = LLTrace::BlockTimer::getCPUClockCount64();
        U64 fpsLimitFrameTime = fpsLimitNow - fpsLimitFrameStartTime;
        static LLCachedControl<U32> fpsLimitMaxFps(gSavedSettings, "MaxFPS", 0);

        if(fpsLimitMaxFps > 0)
        {
            U64 desired_time_ns = (U32)(1000000.f / fpsLimitMaxFps);

            if(fpsLimitFrameTime < desired_time_ns)
            {
                U64 fpsLimitSleepUntil_for = desired_time_ns - fpsLimitFrameTime;
                fpsLimitSleepUntil = LLTrace::BlockTimer::getCPUClockCount64() + fpsLimitSleepUntil_for;
            }
        }


        {
            LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df pauseMainloopTimeout" )
        pingMainloopTimeout("Main:Sleep");

        pauseMainloopTimeout();
        }

        // Sleep and run background threads
        {
            //LL_RECORD_BLOCK_TIME(SLEEP2);
            LL_PROFILE_ZONE_WARN( "Sleep2" )

            // yield some time to the os based on command line option
            static LLCachedControl<S32> yield_time(gSavedSettings, "YieldTime", -1);
            if(yield_time >= 0)
            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP("Yield");
                LL_PROFILE_ZONE_NUM( yield_time )
                ms_sleep(yield_time);
            }

            if (gNonInteractive)
            {
                S32 non_interactive_ms_sleep_time = 100;
                LLAppViewer::getTextureCache()->pause();
                ms_sleep(non_interactive_ms_sleep_time);
            }

            // yield cooperatively when not running as foreground window
            // and when not quiting (causes trouble at mac's cleanup stage)
            if (!LLApp::isExiting()
                && ((gViewerWindow && !gViewerWindow->getWindow()->getVisible())
                    || !gFocusMgr.getAppHasFocus()))
            {
                // Sleep if we're not rendering, or the window is minimized.
                static LLCachedControl<S32> s_background_yield_time(gSavedSettings, "BackgroundYieldTime", 40);
                S32 milliseconds_to_sleep = llclamp((S32)s_background_yield_time, 0, 1000);
                // don't sleep when BackgroundYieldTime set to 0, since this will still yield to other threads
                // of equal priority on Windows
                if (milliseconds_to_sleep > 0)
                {
                    LLPerfStats::RecordSceneTime T ( LLPerfStats::StatType_t::RENDER_SLEEP );
                    ms_sleep(milliseconds_to_sleep);
                    // also pause worker threads during this wait period
                    LLAppViewer::getTextureCache()->pause();
                }
            }

            if (mRandomizeFramerate)
            {
                ms_sleep(rand() % 200);
            }

            if (mPeriodicSlowFrame
                && (gFrameCount % 10 == 0))
            {
                LL_INFOS() << "Periodic slow frame - sleeping 500 ms" << LL_ENDL;
                ms_sleep(500);
            }

            S32 total_work_pending = 0;
            S32 total_io_pending = 0;
            {
                S32 work_pending = 0;
                S32 io_pending = 0;
                F32 max_time = llmin(gFrameIntervalSeconds.value() *10.f, 1.f);

                work_pending += updateTextureThreads(max_time);

                {
                    LL_PROFILE_ZONE_NAMED_CATEGORY_APP("LFS Thread");
                    io_pending += LLLFSThread::updateClass(1);
                }

                if (io_pending > 1000)
                {
                    ms_sleep(llmin(io_pending/100,100)); // give the lfs some time to catch up
                }

                total_work_pending += work_pending ;
                total_io_pending += io_pending ;

            }

            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df gMeshRepo" )
            gMeshRepo.update() ;
            }

            if(!total_work_pending) //pause texture fetching threads if nothing to process.
            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df getTextureCache" )
                LLAppViewer::getTextureCache()->pause();
                LLAppViewer::getTextureFetch()->pause();
            }
            if(!total_io_pending) //pause file threads if nothing to process.
            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df LLVFSThread" )
                LLLFSThread::sLocal->pause();
            }

            {
                LL_PROFILE_ZONE_NAMED_CATEGORY_APP( "df resumeMainloopTimeout" )
                resumeMainloopTimeout();
            }
            pingMainloopTimeout("Main:End");
        }
    }

    if (LLApp::isExiting())
    {
        // Save snapshot for next time, if we made it through initialization
        if (STATE_STARTED == LLStartUp::getStartupState())
        {
            saveFinalSnapshot();
        }

        if (LLVoiceClient::instanceExists())
        {
            LLVoiceClient::getInstance()->terminate();
        }

        delete gServicePump;
        gServicePump = NULL;

        destroyMainloopTimeout();

        LL_INFOS() << "Exiting main_loop" << LL_ENDL;
    }
    }LLPerfStats::StatsRecorder::endFrame();
    LL_PROFILER_FRAME_END

    return ! LLApp::isRunning();
}

S32 LLAppViewer::updateTextureThreads(F32 max_time)
{
    S32 work_pending = 0;
    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_APP("Texture Cache");
        work_pending += LLAppViewer::getTextureCache()->update(max_time); // unpauses the texture cache thread
    }
    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_APP("Image Decode");
        work_pending += LLAppViewer::getImageDecodeThread()->update(max_time); // unpauses the image thread
    }
    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_APP("Image Fetch");
        work_pending += LLAppViewer::getTextureFetch()->update(max_time); // unpauses the texture fetch thread
    }
    return work_pending;
}

void LLAppViewer::flushLFSIO()
{
    S32 pending = LLLFSThread::updateClass(0);
    if (pending > 0)
    {
        LL_INFOS() << "Waiting for pending IO to finish: " << pending << LL_ENDL;
        while (1)
        {
            pending = LLLFSThread::updateClass(0);
            if (!pending)
            {
                break;
            }
            ms_sleep(100);
        }
    }
}

bool LLAppViewer::cleanup()
{
    LLAtmosphere::cleanupClass();

    //ditch LLVOAvatarSelf instance
    gAgentAvatarp = NULL;

    LLNotifications::instance().clear();

    // workaround for DEV-35406 crash on shutdown
    LLEventPumps::instance().reset(true);

    //dump scene loading monitor results
    if (LLSceneMonitor::instanceExists())
    {
        if (!isSecondInstance())
        {
            std::string dump_path = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, "scene_monitor_results.csv");
            LLSceneMonitor::instance().dumpToFile(dump_path);
        }
        LLSceneMonitor::deleteSingleton();
    }

    // There used to be an 'if (LLFastTimerView::sAnalyzePerformance)' block
    // here, completely redundant with the one that occurs later in this same
    // function. Presumably the duplication was due to an automated merge gone
    // bad. Not knowing which instance to prefer, we chose to retain the later
    // one because it happens just after mFastTimerLogThread is deleted. This
    // comment is in case we guessed wrong, so we can move it here instead.

#if LL_LINUX || __FreeBSD__
    // remove any old breakpad minidump files from the log directory
    if (! isError())
    {
        std::string logdir = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, "");
        gDirUtilp->deleteFilesInDir(logdir, "*-*-*-*-*.dmp");
    }
#endif

    // Kill off LLLeap objects. We can find them all because LLLeap is derived
    // from LLInstanceTracker.
    LLLeap::instance_snapshot().deleteAll();

    //flag all elements as needing to be destroyed immediately
    // to ensure shutdown order
    LLMortician::setZealous(TRUE);

    // Give any remaining SLPlugin instances a chance to exit cleanly.
    LLPluginProcessParent::shutdown();

    disconnectViewer();
    LLViewerCamera::deleteSingleton();

    LL_INFOS() << "Viewer disconnected" << LL_ENDL;

    if (gKeyboard)
    {
        gKeyboard->resetKeys();
    }

    display_cleanup();

    release_start_screen(); // just in case

    LLError::logToFixedBuffer(NULL); // stop the fixed buffer recorder

    LL_INFOS() << "Cleaning Up" << LL_ENDL;

    // shut down mesh streamer
    gMeshRepo.shutdown();

    // shut down Havok
    LLPhysicsExtensions::quitSystem();

    // Must clean up texture references before viewer window is destroyed.
    if(LLHUDManager::instanceExists())
    {
        LLHUDManager::getInstance()->updateEffects();
        LLHUDObject::updateAll();
        LLHUDManager::getInstance()->cleanupEffects();
        LLHUDObject::cleanupHUDObjects();
        LL_INFOS() << "HUD Objects cleaned up" << LL_ENDL;
    }

    LLKeyframeDataCache::clear();

    // End TransferManager before deleting systems it depends on (Audio, AssetStorage)
#if 0 // this seems to get us stuck in an infinite loop...
    gTransferManager.cleanup();
#endif

    // Note: this is where gWorldMap used to be deleted.

    // Note: this is where gHUDManager used to be deleted.
    if(LLHUDManager::instanceExists())
    {
        LLHUDManager::getInstance()->shutdownClass();
    }

    delete gAssetStorage;
    gAssetStorage = NULL;

    LLPolyMesh::freeAllMeshes();

    LLStartUp::cleanupNameCache();

    // Note: this is where gLocalSpeakerMgr and gActiveSpeakerMgr used to be deleted.

    if (LLWorldMap::instanceExists())
    {
        LLWorldMap::getInstance()->reset(); // release any images
    }

    LLCalc::cleanUp();

    LL_INFOS() << "Global stuff deleted" << LL_ENDL;

    if (gAudiop)
    {
        LL_INFOS() << "Shutting down audio" << LL_ENDL;

        // be sure to stop the internet stream cleanly BEFORE destroying the interface to stop it.
        gAudiop->stopInternetStream();
        // shut down the streaming audio sub-subsystem first, in case it relies on not outliving the general audio subsystem.
        LLStreamingAudioInterface *sai = gAudiop->getStreamingAudioImpl();
        delete sai;
        gAudiop->setStreamingAudioImpl(NULL);

        // shut down the audio subsystem
        gAudiop->shutdown();

        delete gAudiop;
        gAudiop = NULL;
    }

    // Note: this is where LLFeatureManager::getInstance()-> used to be deleted.

    // Patch up settings for next time
    // Must do this before we delete the viewer window,
    // such that we can suck rectangle information out of
    // it.
    cleanupSavedSettings();
    LL_INFOS() << "Settings patched up" << LL_ENDL;

    // delete some of the files left around in the cache.
    removeCacheFiles("*.wav");
    removeCacheFiles("*.tmp");
    removeCacheFiles("*.lso");
    removeCacheFiles("*.out");
    removeCacheFiles("*.dsf");
    removeCacheFiles("*.bodypart");
    removeCacheFiles("*.clothing");

    LL_INFOS() << "Cache files removed" << LL_ENDL;

    LL_INFOS() << "Shutting down Views" << LL_ENDL;

    // Destroy the UI
    if( gViewerWindow)
        gViewerWindow->shutdownViews();

    LL_INFOS() << "Cleaning up Inventory" << LL_ENDL;

    // Cleanup Inventory after the UI since it will delete any remaining observers
    // (Deleted observers should have already removed themselves)
    gInventory.cleanupInventory();

    LLCoros::getInstance()->printActiveCoroutines();

    LL_INFOS() << "Cleaning up Selections" << LL_ENDL;

    // Clean up selection managers after UI is destroyed, as UI may be observing them.
    // Clean up before GL is shut down because we might be holding on to objects with texture references
    LLSelectMgr::cleanupGlobals();

    LL_INFOS() << "Shutting down OpenGL" << LL_ENDL;

    // Shut down OpenGL
    if( gViewerWindow)
    {
        gViewerWindow->shutdownGL();

        // Destroy window, and make sure we're not fullscreen
        // This may generate window reshape and activation events.
        // Therefore must do this before destroying the message system.
        delete gViewerWindow;
        gViewerWindow = NULL;
        LL_INFOS() << "ViewerWindow deleted" << LL_ENDL;
    }

    LLSplashScreen::show();
    LLSplashScreen::update(LLTrans::getString("ShuttingDown"));

    LL_INFOS() << "Cleaning up Keyboard & Joystick" << LL_ENDL;

    // viewer UI relies on keyboard so keep it aound until viewer UI isa gone
    delete gKeyboard;
    gKeyboard = NULL;

    if (LLViewerJoystick::instanceExists())
    {
        // Turn off Space Navigator and similar devices
        LLViewerJoystick::getInstance()->terminate();
    }

    LL_INFOS() << "Cleaning up Objects" << LL_ENDL;

    LLViewerObject::cleanupVOClasses();

    SUBSYSTEM_CLEANUP(LLAvatarAppearance);

    SUBSYSTEM_CLEANUP(LLPostProcess);

    LLTracker::cleanupInstance();

    // *FIX: This is handled in LLAppViewerWin32::cleanup().
    // I'm keeping the comment to remember its order in cleanup,
    // in case of unforseen dependency.
    //#if LL_WINDOWS
    //  gDXHardware.cleanup();
    //#endif // LL_WINDOWS

    LLVolumeMgr* volume_manager = LLPrimitive::getVolumeManager();
    if (!volume_manager->cleanup())
    {
        LL_WARNS() << "Remaining references in the volume manager!" << LL_ENDL;
    }
    LLPrimitive::cleanupVolumeManager();

    LL_INFOS() << "Additional Cleanup..." << LL_ENDL;

    LLViewerParcelMgr::cleanupGlobals();

    // *Note: this is where gViewerStats used to be deleted.

    //end_messaging_system();

    LLPrimitive::cleanupVolumeManager();
    SUBSYSTEM_CLEANUP(LLWorldMapView);
    SUBSYSTEM_CLEANUP(LLFolderViewItem);

    LL_INFOS() << "Saving Data" << LL_ENDL;

    // Store the time of our current logoff
    gSavedPerAccountSettings.setU32("LastLogoff", time_corrected());

    if (LLEnvironment::instanceExists())
    {
        //Store environment settings if necessary
        LLEnvironment::getInstance()->saveToSettings();
    }

    // Must do this after all panels have been deleted because panels that have persistent rects
    // save their rects on delete.
    gSavedSettings.saveToFile(gSavedSettings.getString("ClientSettingsFile"), TRUE);

    LLUIColorTable::instance().saveUserSettings();

    // PerAccountSettingsFile should be empty if no user has been logged on.
    // *FIX:Mani This should get really saved in a "logoff" mode.
    if (gSavedSettings.getString("PerAccountSettingsFile").empty())
    {
        LL_INFOS() << "Not saving per-account settings; don't know the account name yet." << LL_ENDL;
    }
    // Only save per account settings if the previous login succeeded, otherwise
    // we might end up with a cleared out settings file in case a previous login
    // failed after loading per account settings.
    else if (!mSavePerAccountSettings)
    {
        LL_INFOS() << "Not saving per-account settings; last login was not successful." << LL_ENDL;
    }
    else
    {
        gSavedPerAccountSettings.saveToFile(gSavedSettings.getString("PerAccountSettingsFile"), TRUE);
        LL_INFOS() << "Saved settings" << LL_ENDL;

        if (LLViewerParcelAskPlay::instanceExists())
        {
            LLViewerParcelAskPlay::getInstance()->saveSettings();
        }
    }

    std::string warnings_settings_filename = gDirUtilp->getExpandedFilename(LL_PATH_USER_SETTINGS, getSettingsFilename("Default", "Warnings"));
    gWarningSettings.saveToFile(warnings_settings_filename, TRUE);

    // Save URL history file
    LLURLHistory::saveFile("url_history.xml");

    // save mute list. gMuteList used to also be deleted here too.
    if (gAgent.isInitialized() && LLMuteList::instanceExists())
    {
        LLMuteList::getInstance()->cache(gAgent.getID());
    }

    //save call log list
    if (LLConversationLog::instanceExists())
    {
        LLConversationLog::instance().cache();
    }

    clearSecHandler();

    if (mPurgeCacheOnExit)
    {
        LL_INFOS() << "Purging all cache files on exit" << LL_ENDL;
        gDirUtilp->deleteFilesInDir(gDirUtilp->getExpandedFilename(LL_PATH_CACHE,""), "*.*");
    }

    writeDebugInfo();

    LLLocationHistory::getInstance()->save();

    LLAvatarIconIDCache::getInstance()->save();

    // Stop the plugin read thread if it's running.
    LLPluginProcessParent::setUseReadThread(false);

    LL_INFOS() << "Shutting down Threads" << LL_ENDL;

    // Let threads finish
    LLTimer idleTimer;
    idleTimer.reset();
    const F64 max_idle_time = 5.f; // 5 seconds
    while(1)
    {
        S32 pending = 0;
        pending += LLAppViewer::getTextureCache()->update(1); // unpauses the worker thread
        pending += LLAppViewer::getImageDecodeThread()->update(1); // unpauses the image thread
        pending += LLAppViewer::getTextureFetch()->update(1); // unpauses the texture fetch thread
        pending += LLLFSThread::updateClass(0);
        F64 idle_time = idleTimer.getElapsedTimeF64();
        if(!pending)
        {
            break ; //done
        }
        else if(idle_time >= max_idle_time)
        {
            LL_WARNS() << "Quitting with pending background tasks." << LL_ENDL;
            break;
        }
    }

    if (mPurgeUserDataOnExit)
    {
        // Ideally we should not save anything from this session since it is going to be purged now,
        // but this is a very 'rare' case (user deleting himself), not worth overcomplicating 'save&cleanup' code
        std::string user_path = gDirUtilp->getOSUserAppDir() + gDirUtilp->getDirDelimiter() + LLStartUp::getUserId();
        gDirUtilp->deleteDirAndContents(user_path);
    }

    // Delete workers first
    // shotdown all worker threads before deleting them in case of co-dependencies
    mAppCoreHttp.requestStop();
    sTextureFetch->shutdown();
    sTextureCache->shutdown();
    sImageDecodeThread->shutdown();
    sPurgeDiskCacheThread->shutdown();
    if (mGeneralThreadPool)
    {
        mGeneralThreadPool->close();
    }

    sTextureFetch->shutDownTextureCacheThread() ;
    LLLFSThread::sLocal->shutdown();

    LL_INFOS() << "Shutting down message system" << LL_ENDL;
    end_messaging_system();

    // Non-LLCurl libcurl library
    mAppCoreHttp.cleanup();

    SUBSYSTEM_CLEANUP(LLFilePickerThread);
    SUBSYSTEM_CLEANUP(LLDirPickerThread);

    //MUST happen AFTER SUBSYSTEM_CLEANUP(LLCurl)
    delete sTextureCache;
    sTextureCache = NULL;
    if (sTextureFetch)
    {
        sTextureFetch->shutdown();
        sTextureFetch->waitOnPending();
        delete sTextureFetch;
        sTextureFetch = NULL;
    }
    delete sImageDecodeThread;
    sImageDecodeThread = NULL;
    delete mFastTimerLogThread;
    mFastTimerLogThread = NULL;
    delete sPurgeDiskCacheThread;
    sPurgeDiskCacheThread = NULL;
    delete mGeneralThreadPool;
    mGeneralThreadPool = NULL;

    if (LLFastTimerView::sAnalyzePerformance)
    {
        LL_INFOS() << "Analyzing performance" << LL_ENDL;

        std::string baseline_name = LLTrace::BlockTimer::sLogName + "_baseline.slp";
        std::string current_name  = LLTrace::BlockTimer::sLogName + ".slp";
        std::string report_name   = LLTrace::BlockTimer::sLogName + "_report.csv";

        LLFastTimerView::doAnalysis(
            gDirUtilp->getExpandedFilename(LL_PATH_LOGS, baseline_name),
            gDirUtilp->getExpandedFilename(LL_PATH_LOGS, current_name),
            gDirUtilp->getExpandedFilename(LL_PATH_LOGS, report_name));
    }

    SUBSYSTEM_CLEANUP(LLMetricPerformanceTesterBasic) ;

    LL_INFOS() << "Cleaning up Media and Textures" << LL_ENDL;

    //Note:
    //SUBSYSTEM_CLEANUP(LLViewerMedia) has to be put before gTextureList.shutdown()
    //because some new image might be generated during cleaning up media. --bao
    gTextureList.shutdown(); // shutdown again in case a callback added something
    LLUIImageList::getInstance()->cleanUp();

    SUBSYSTEM_CLEANUP(LLImage);
    SUBSYSTEM_CLEANUP(LLLFSThread);

    LL_INFOS() << "Misc Cleanup" << LL_ENDL;

    gSavedSettings.cleanup();
    LLUIColorTable::instance().clear();

    LLWatchdog::getInstance()->cleanup();

    LLViewerAssetStatsFF::cleanup();

    // If we're exiting to launch an URL, do that here so the screen
    // is at the right resolution before we launch IE.
    if (!gLaunchFileOnQuit.empty())
    {
        LL_INFOS() << "Launch file on quit." << LL_ENDL;
#if LL_WINDOWS
        // Indicate an application is starting.
        SetCursor(LoadCursor(NULL, IDC_WAIT));
#endif

        // HACK: Attempt to wait until the screen res. switch is complete.
        ms_sleep(1000);

        LLWeb::loadURLExternal( gLaunchFileOnQuit, false );
        LL_INFOS() << "File launched." << LL_ENDL;
    }
    // make sure nothing uses applyProxySettings by this point.
    LL_INFOS() << "Cleaning up LLProxy." << LL_ENDL;
    SUBSYSTEM_CLEANUP(LLProxy);
    LLCore::LLHttp::cleanup();

    ll_close_fail_log();

    LLError::LLCallStacks::cleanup();
    LL::GLTFSceneManager::deleteSingleton();
    LLEnvironment::deleteSingleton();
    LLSelectMgr::deleteSingleton();
    LLViewerEventRecorder::deleteSingleton();
    LLWorld::deleteSingleton();
    LLVoiceClient::deleteSingleton();

    // It's not at first obvious where, in this long sequence, a generic cleanup
    // call OUGHT to go. So let's say this: as we migrate cleanup from
    // explicit hand-placed calls into the generic mechanism, eventually
    // all cleanup will get subsumed into the generic call. So the calls you
    // still see above are calls that MUST happen before the generic cleanup
    // kicks in.

    // This calls every remaining LLSingleton's cleanupSingleton() and
    // deleteSingleton() methods.
    LLSingletonBase::deleteAll();

    LLSplashScreen::hide();

    LL_INFOS() << "Goodbye!" << LL_ENDL;

    removeDumpDir();

    // return 0;
    return true;
}

void LLAppViewer::initGeneralThread()
{
    if (mGeneralThreadPool)
    {
        return;
    }

    mGeneralThreadPool = new LL::ThreadPool("General", 3);
    mGeneralThreadPool->start();
}

bool LLAppViewer::initThreads()
{
    static const bool enable_threads = true;

    LLImage::initClass(gSavedSettings.getBOOL("TextureNewByteRange"),gSavedSettings.getS32("TextureReverseByteRange"));

    LLLFSThread::initClass(enable_threads && true); // TODO: fix crashes associated with this shutdo

    //auto configure thread count
    LLSD threadCounts = gSavedSettings.getLLSD("ThreadPoolSizes");

    // get the number of concurrent threads that can run
    S32 cores = std::thread::hardware_concurrency();

    U32 max_cores = gSavedSettings.getU32("EmulateCoreCount");
    if (max_cores != 0)
    {
        cores = llmin(cores, (S32) max_cores);
    }

    // The only configurable thread count right now is ImageDecode
    // The viewer typically starts around 8 threads not including image decode,
    // so try to leave at least one core free
    S32 image_decode_count = llclamp(cores - 9, 1, 8);
    threadCounts["ImageDecode"] = image_decode_count;
    gSavedSettings.setLLSD("ThreadPoolSizes", threadCounts);

    // Image decoding
    LLAppViewer::sImageDecodeThread = new LLImageDecodeThread(enable_threads && true);
    LLAppViewer::sTextureCache = new LLTextureCache(enable_threads && true);
    LLAppViewer::sTextureFetch = new LLTextureFetch(LLAppViewer::getTextureCache(),
                                                    enable_threads && true,
                                                    app_metrics_qa_mode);

    // general task background thread (LLPerfStats, etc)
    LLAppViewer::instance()->initGeneralThread();

    LLAppViewer::sPurgeDiskCacheThread = new LLPurgeDiskCacheThread();

    if (LLTrace::BlockTimer::sLog || LLTrace::BlockTimer::sMetricLog)
    {
        LLTrace::BlockTimer::setLogLock(new LLMutex());
        mFastTimerLogThread = new LLFastTimerLogThread(LLTrace::BlockTimer::sLogName);
        mFastTimerLogThread->start();
    }

    // Mesh streaming and caching
    gMeshRepo.init();

    LLFilePickerThread::initClass();
    LLDirPickerThread::initClass();

    // *FIX: no error handling here!
    return true;
}

void errorCallback(LLError::ELevel level, const std::string &error_string)
{
    if (level == LLError::LEVEL_ERROR)
    {
#ifndef LL_RELEASE_FOR_DOWNLOAD
        OSMessageBox(error_string, LLTrans::getString("MBFatalError"), OSMB_OK);
#endif

        gDebugInfo["FatalMessage"] = error_string;
        // We're not already crashing -- we simply *intend* to crash. Since we
        // haven't actually trashed anything yet, we can afford to write the whole
        // static info file.
        LLAppViewer::instance()->writeDebugInfo();
    }
}

void errorMSG(const std::string& title_string, const std::string& message_string)
{
    if (!message_string.empty())
    {
        OSMessageBox(message_string, title_string.empty() ? LLTrans::getString("MBFatalError") : title_string, OSMB_OK);
    }
}

void LLAppViewer::initLoggingAndGetLastDuration()
{
    //
    // Set up logging defaults for the viewer
    //
    LLError::initForApplication( gDirUtilp->getExpandedFilename(LL_PATH_USER_SETTINGS, "")
                                ,gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS, "")
                                );
    LLError::addGenericRecorder(&errorCallback);
    //LLError::setTimeFunction(getRuntime);

    LLError::LLUserWarningMsg::setHandler(errorMSG);


    if (mSecondInstance)
    {
        LLFile::mkdir(gDirUtilp->getDumpLogsDirPath());

        LLUUID uid;
        uid.generate();
        LLError::logToFile(gDirUtilp->getDumpLogsDirPath(uid.asString() + ".log"));
    }
    else
    {
        // Remove the last ".old" log file.
        std::string old_log_file = gDirUtilp->getExpandedFilename(LL_PATH_LOGS,
            "SecondLife.old");
        LLFile::remove(old_log_file);

        // Get name of the log file
        std::string log_file = gDirUtilp->getExpandedFilename(LL_PATH_LOGS,
            "SecondLife.log");
        /*
        * Before touching any log files, compute the duration of the last run
        * by comparing the ctime of the previous start marker file with the ctime
        * of the last log file.
        */
        std::string start_marker_file_name = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, START_MARKER_FILE_NAME);
        llstat start_marker_stat;
        llstat log_file_stat;
        std::ostringstream duration_log_stream; // can't log yet, so save any message for when we can below
        int start_stat_result = LLFile::stat(start_marker_file_name, &start_marker_stat);
        int log_stat_result = LLFile::stat(log_file, &log_file_stat);
        if (0 == start_stat_result && 0 == log_stat_result)
        {
            int elapsed_seconds = log_file_stat.st_ctime - start_marker_stat.st_ctime;
            // only report a last run time if the last viewer was the same version
            // because this stat will be counted against this version
            if (markerIsSameVersion(start_marker_file_name))
            {
                gLastExecDuration = elapsed_seconds;
            }
            else
            {
                duration_log_stream << "start marker from some other version; duration is not reported";
                gLastExecDuration = -1;
            }
        }
        else
        {
            // at least one of the LLFile::stat calls failed, so we can't compute the run time
            duration_log_stream << "duration stat failure; start: " << start_stat_result << " log: " << log_stat_result;
            gLastExecDuration = -1; // unknown
        }
        std::string duration_log_msg(duration_log_stream.str());

        // Create a new start marker file for comparison with log file time for the next run
        LLAPRFile start_marker_file;
        start_marker_file.open(start_marker_file_name, LL_APR_WB);
        if (start_marker_file.getFileHandle())
        {
            recordMarkerVersion(start_marker_file);
            start_marker_file.close();
        }

        // Rename current log file to ".old"
        LLFile::rename(log_file, old_log_file);

        // Set the log file to SecondLife.log
        LLError::logToFile(log_file);
        if (!duration_log_msg.empty())
        {
            LL_WARNS("MarkerFile") << duration_log_msg << LL_ENDL;
        }
    }
}

bool LLAppViewer::loadSettingsFromDirectory(const std::string& location_key,
                        bool set_defaults)
{
    if (!mSettingsLocationList)
    {
        LL_ERRS() << "Invalid settings location list" << LL_ENDL;
    }

    for (const SettingsGroup& group : mSettingsLocationList->groups)
    {
        // skip settings groups that aren't the one we requested
        if (group.name() != location_key) continue;

        ELLPath path_index = (ELLPath)group.path_index();
        if(path_index <= LL_PATH_NONE || path_index >= LL_PATH_LAST)
        {
            LL_ERRS() << "Out of range path index in app_settings/settings_files.xml" << LL_ENDL;
            return false;
        }

        for (const SettingsFile& file : group.files)
        {
            LL_INFOS("Settings") << "Attempting to load settings for the group " << file.name()
                << " - from location " << location_key << LL_ENDL;

            auto settings_group = LLControlGroup::getInstance(file.name);
            if(!settings_group)
            {
                LL_WARNS("Settings") << "No matching settings group for name " << file.name() << LL_ENDL;
                continue;
            }

            std::string full_settings_path;

            if (file.file_name_setting.isProvided()
                && gSavedSettings.controlExists(file.file_name_setting))
            {
                // try to find filename stored in file_name_setting control
                full_settings_path = gSavedSettings.getString(file.file_name_setting);
                if (full_settings_path.empty())
                {
                    continue;
                }
                else if (!gDirUtilp->fileExists(full_settings_path))
                {
                    // search in default path
                    full_settings_path = gDirUtilp->getExpandedFilename((ELLPath)path_index, full_settings_path);
                }
            }
            else
            {
                // by default, use specified file name
                full_settings_path = gDirUtilp->getExpandedFilename((ELLPath)path_index, file.file_name());
            }

            if(settings_group->loadFromFile(full_settings_path, set_defaults, file.persistent))
            {   // success!
                LL_INFOS("Settings") << "Loaded settings file " << full_settings_path << LL_ENDL;
            }
            else
            {   // failed to load
                if(file.required)
                {
                    LLError::LLUserWarningMsg::showMissingFiles();
                    LL_ERRS() << "Error: Cannot load required settings file from: " << full_settings_path << LL_ENDL;
                    return false;
                }
                else
                {
                    // only complain if we actually have a filename at this point
                    if (!full_settings_path.empty())
                    {
                        LL_INFOS("Settings") << "Cannot load " << full_settings_path << " - No settings found." << LL_ENDL;
                    }
                }
            }
        }
    }

    return true;
}

std::string LLAppViewer::getSettingsFilename(const std::string& location_key,
                                             const std::string& file)
{
    for (const SettingsGroup& group : mSettingsLocationList->groups)
    {
        if (group.name() == location_key)
        {
            for (const SettingsFile& settings_file : group.files)
            {
                if (settings_file.name() == file)
                {
                    return settings_file.file_name;
                }
            }
        }
    }

    return std::string();
}

void LLAppViewer::loadColorSettings()
{
    LLUIColorTable::instance().loadFromSettings();
}

namespace
{
    void handleCommandLineError(LLControlGroupCLP& clp)
    {
        LL_WARNS() << "Error parsing command line options. Command Line options ignored."  << LL_ENDL;

        LL_INFOS() << "Command line usage:\n" << clp << LL_ENDL;

        OSMessageBox(STRINGIZE(LLTrans::getString("MBCmdLineError") << clp.getErrorMessage()),
                     LLStringUtil::null,
                     OSMB_OK);
    }
} // anonymous namespace

// Set a named control temporarily for this session, as when set via the command line --set option.
// Name can be specified as "<control_group>.<control_name>", with default group being Global.
bool tempSetControl(const std::string& name, const std::string& value)
{
    std::string name_part;
    std::string group_part;
    LLControlVariable* control = NULL;

    // Name can be further split into ControlGroup.Name, with the default control group being Global
    size_t pos = name.find('.');
    if (pos != std::string::npos)
    {
        group_part = name.substr(0, pos);
        name_part = name.substr(pos+1);
        LL_INFOS() << "Setting " << group_part << "." << name_part << " to " << value << LL_ENDL;
        auto g = LLControlGroup::getInstance(group_part);
        if (g) control = g->getControl(name_part);
    }
    else
    {
        LL_INFOS() << "Setting Global." << name << " to " << value << LL_ENDL;
        control = gSavedSettings.getControl(name);
    }

    if (control)
    {
        control->setValue(value, false);
        return true;
    }
    return false;
}

bool LLAppViewer::initConfiguration()
{
    //Load settings files list
    std::string settings_file_list = gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS, "settings_files.xml");
    LLXMLNodePtr root;
    BOOL success = LLXMLNode::parseFile(settings_file_list, root, NULL);
    if (!success)
    {
        LL_WARNS() << "Cannot load default configuration file " << settings_file_list << LL_ENDL;
        LLError::LLUserWarningMsg::showMissingFiles();
        if (gDirUtilp->fileExists(settings_file_list))
        {
            LL_ERRS() << "Cannot load default configuration file settings_files.xml. "
                << "Please reinstall viewer from https://secondlife.com/support/downloads/ "
                << "and contact https://support.secondlife.com if issue persists after reinstall."
                << LL_ENDL;
        }
        else
        {
            LL_ERRS() << "Default configuration file settings_files.xml not found. "
                << "Please reinstall viewer from https://secondlife.com/support/downloads/ "
                << "and contact https://support.secondlife.com if issue persists after reinstall."
                << LL_ENDL;
        }
    }

    mSettingsLocationList = new SettingsFiles();

    LLXUIParser parser;
    parser.readXUI(root, *mSettingsLocationList, settings_file_list);

    if (!mSettingsLocationList->validateBlock())
    {
        LLError::LLUserWarningMsg::showMissingFiles();
        LL_ERRS() << "Invalid settings file list " << settings_file_list << LL_ENDL;
    }

    // The settings and command line parsing have a fragile
    // order-of-operation:
    // - load defaults from app_settings
    // - set procedural settings values
    // - read command line settings
    // - selectively apply settings needed to load user settings.
    // - load overrides from user_settings
    // - apply command line settings (to override the overrides)
    // - load per account settings (happens in llstartup

    // - load defaults
    bool set_defaults = true;
    if(!loadSettingsFromDirectory("Default", set_defaults))
    {
        OSMessageBox(
            "Unable to load default settings file. The installation may be corrupted.",
            LLStringUtil::null,OSMB_OK);
        return false;
    }

    initStrings(); // setup paths for LLTrans based on settings files only
    // - set procedural settings
    // Note: can't use LL_PATH_PER_SL_ACCOUNT for any of these since we haven't logged in yet
    gSavedSettings.setString("ClientSettingsFile",
        gDirUtilp->getExpandedFilename(LL_PATH_USER_SETTINGS, getSettingsFilename("Default", "Global")));

#ifndef LL_RELEASE_FOR_DOWNLOAD
    // provide developer build only overrides for these control variables that are not
    // persisted to settings.xml
    LLControlVariable* c = gSavedSettings.getControl("AllowMultipleViewers");
    if (c)
    {
        c->setValue(true, false);
    }

    gSavedSettings.setBOOL("QAMode", TRUE );
    gSavedSettings.setS32("WatchdogEnabled", 0);
#endif

    // These are warnings that appear on the first experience of that condition.
    // They are already set in the settings_default.xml file, but still need to be added to LLFirstUse
    // for disable/reset ability
//  LLFirstUse::addConfigVariable("FirstBalanceIncrease");
//  LLFirstUse::addConfigVariable("FirstBalanceDecrease");
//  LLFirstUse::addConfigVariable("FirstSit");
//  LLFirstUse::addConfigVariable("FirstMap");
//  LLFirstUse::addConfigVariable("FirstGoTo");
//  LLFirstUse::addConfigVariable("FirstBuild");
//  LLFirstUse::addConfigVariable("FirstLeftClickNoHit");
//  LLFirstUse::addConfigVariable("FirstTeleport");
//  LLFirstUse::addConfigVariable("FirstOverrideKeys");
//  LLFirstUse::addConfigVariable("FirstAttach");
//  LLFirstUse::addConfigVariable("FirstAppearance");
//  LLFirstUse::addConfigVariable("FirstInventory");
//  LLFirstUse::addConfigVariable("FirstSandbox");
//  LLFirstUse::addConfigVariable("FirstFlexible");
//  LLFirstUse::addConfigVariable("FirstDebugMenus");
//  LLFirstUse::addConfigVariable("FirstSculptedPrim");
//  LLFirstUse::addConfigVariable("FirstVoice");
//  LLFirstUse::addConfigVariable("FirstMedia");

    // - read command line settings.
    LLControlGroupCLP clp;
    std::string cmd_line_config = gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS,
                                                          "cmd_line.xml");

    clp.configure(cmd_line_config, &gSavedSettings);

    if(!initParseCommandLine(clp))
    {
        handleCommandLineError(clp);
        return false;
    }

    // - selectively apply settings

    // If the user has specified a alternate settings file name.
    // Load it now before loading the user_settings/settings.xml
    if(clp.hasOption("settings"))
    {
        std::string user_settings_filename =
            gDirUtilp->getExpandedFilename(LL_PATH_USER_SETTINGS,
                                           clp.getOption("settings")[0]);
        gSavedSettings.setString("ClientSettingsFile", user_settings_filename);
        LL_INFOS("Settings")    << "Using command line specified settings filename: "
            << user_settings_filename << LL_ENDL;
    }

    // - load overrides from user_settings
    loadSettingsFromDirectory("User");

    if (gSavedSettings.getBOOL("FirstRunThisInstall"))
    {
        // Set firstrun flag to indicate that some further init actiona should be taken
        // like determining screen DPI value and so on
        mIsFirstRun = true;

        gSavedSettings.setBOOL("FirstRunThisInstall", FALSE);
    }

    if (clp.hasOption("sessionsettings"))
    {
        std::string session_settings_filename = clp.getOption("sessionsettings")[0];
        gSavedSettings.setString("SessionSettingsFile", session_settings_filename);
        LL_INFOS("Settings")    << "Using session settings filename: "
            << session_settings_filename << LL_ENDL;
    }
    loadSettingsFromDirectory("Session");

    if (clp.hasOption("usersessionsettings"))
    {
        std::string user_session_settings_filename = clp.getOption("usersessionsettings")[0];
        gSavedSettings.setString("UserSessionSettingsFile", user_session_settings_filename);
        LL_INFOS("Settings") << "Using user session settings filename: "
            << user_session_settings_filename << LL_ENDL;

    }
    loadSettingsFromDirectory("UserSession");

    // - apply command line settings
    if (! clp.notify())
    {
        handleCommandLineError(clp);
        return false;
    }

    // Register the core crash option as soon as we can
    // if we want gdb post-mortem on cores we need to be up and running
    // ASAP or we might miss init issue etc.
    if(gSavedSettings.getBOOL("DisableCrashLogger"))
    {
        LL_WARNS() << "Crashes will be handled by system, stack trace logs and crash logger are both disabled" << LL_ENDL;
        disableCrashlogger();
    }

    gNonInteractive = gSavedSettings.getBOOL("NonInteractive");
    // Handle initialization from settings.
    // Start up the debugging console before handling other options.
    if (gSavedSettings.getBOOL("ShowConsoleWindow") && !gNonInteractive)
    {
        initConsole();
    }

    if(clp.hasOption("help"))
    {
        std::ostringstream msg;
        msg << LLTrans::getString("MBCmdLineUsg") << "\n" << clp;
        LL_INFOS()  << msg.str() << LL_ENDL;

        OSMessageBox(
            msg.str(),
            LLStringUtil::null,
            OSMB_OK);

        return false;
    }

    if(clp.hasOption("set"))
    {
        const LLCommandLineParser::token_vector_t& set_values = clp.getOption("set");
        if(0x1 & set_values.size())
        {
            LL_WARNS() << "Invalid '--set' parameter count." << LL_ENDL;
        }
        else
        {
            LLCommandLineParser::token_vector_t::const_iterator itr = set_values.begin();
            for(; itr != set_values.end(); ++itr)
            {
                const std::string& name = *itr;
                const std::string& value = *(++itr);
                if (!tempSetControl(name,value))
                {
                    LL_WARNS() << "Failed --set " << name << ": setting name unknown." << LL_ENDL;
                }
            }
        }
    }

    if  (clp.hasOption("logevents")) {
        LLViewerEventRecorder::instance().setEventLoggingOn();
    }

    std::string CmdLineChannel(gSavedSettings.getString("CmdLineChannel"));
    if(! CmdLineChannel.empty())
    {
        LLVersionInfo::instance().resetChannel(CmdLineChannel);
    }

    // If we have specified crash on startup, set the global so we'll trigger the crash at the right time
    gCrashOnStartup = gSavedSettings.getBOOL("CrashOnStartup");

    if (gSavedSettings.getBOOL("LogPerformance"))
    {
        LLTrace::BlockTimer::sLog = true;
        LLTrace::BlockTimer::sLogName = std::string("performance");
    }

    std::string test_name(gSavedSettings.getString("LogMetrics"));
    if (! test_name.empty())
    {
        LLTrace::BlockTimer::sMetricLog = TRUE;
        // '--logmetrics' is specified with a named test metric argument so the data gathering is done only on that test
        // In the absence of argument, every metric would be gathered (makes for a rather slow run and hard to decipher report...)
        LL_INFOS() << "'--logmetrics' argument : " << test_name << LL_ENDL;
        LLTrace::BlockTimer::sLogName = test_name;
    }

    if (clp.hasOption("graphicslevel"))
    {
        // User explicitly requested --graphicslevel on the command line. We
        // expect this switch has already set RenderQualityPerformance. Check
        // that value for validity later.
        // Capture the requested value separately from the settings variable
        // because, if this is the first run, LLViewerWindow's constructor
        // will call LLFeatureManager::applyRecommendedSettings(), which
        // overwrites this settings variable!
        mForceGraphicsLevel = gSavedSettings.getU32("RenderQualityPerformance");
    }

    LLFastTimerView::sAnalyzePerformance = gSavedSettings.getBOOL("AnalyzePerformance");
    gAgentPilot.setReplaySession(gSavedSettings.getBOOL("ReplaySession"));

    if (gSavedSettings.getBOOL("DebugSession"))
    {
        gDebugSession = TRUE;
        gDebugGL = TRUE;

        ll_init_fail_log(gDirUtilp->getExpandedFilename(LL_PATH_LOGS, "test_failures.log"));
    }

    if (gSavedSettings.getBOOL("RenderDebugGLSession"))
    {
        gDebugGLSession = TRUE;
        gDebugGL = TRUE;
        // gDebugGL can cause excessive logging
        // so it's limited to a single session
        gSavedSettings.setBOOL("RenderDebugGLSession", FALSE);
    }

    const LLControlVariable* skinfolder = gSavedSettings.getControl("SkinCurrent");
    if(skinfolder && LLStringUtil::null != skinfolder->getValue().asString())
    {
        // Examining "Language" may not suffice -- see LLUI::getLanguage()
        // logic. Unfortunately LLUI::getLanguage() doesn't yet do us much
        // good because we haven't yet called LLUI::initClass().
        gDirUtilp->setSkinFolder(skinfolder->getValue().asString(),
                                 gSavedSettings.getString("Language"));
    }

    if (gSavedSettings.getBOOL("SpellCheck"))
    {
        std::list<std::string> dict_list;
        std::string dict_setting = gSavedSettings.getString("SpellCheckDictionary");
        boost::split(dict_list, dict_setting, boost::is_any_of(std::string(",")));
        if (!dict_list.empty())
        {
            LLSpellChecker::setUseSpellCheck(dict_list.front());
            dict_list.pop_front();
            LLSpellChecker::instance().setSecondaryDictionaries(dict_list);
        }
    }

    if (gNonInteractive)
    {
        tempSetControl("AllowMultipleViewers", "TRUE");
        tempSetControl("SLURLPassToOtherInstance", "FALSE");
        tempSetControl("RenderWater", "FALSE");
        tempSetControl("FlyingAtExit", "FALSE");
        tempSetControl("WindowWidth", "1024");
        tempSetControl("WindowHeight", "200");
        LLError::setEnabledLogTypesMask(0);
        llassert_always(!gSavedSettings.getBOOL("SLURLPassToOtherInstance"));
    }


    // Handle slurl use. NOTE: Don't let SL-55321 reappear.
    // This initial-SLURL logic, up through the call to
    // sendURLToOtherInstance(), must precede LLSplashScreen::show() --
    // because if sendURLToOtherInstance() succeeds, we take a fast exit,
    // SKIPPING the splash screen and everything else.

    // *FIX: This init code should be made more robust to prevent
    // the issue SL-55321 from returning. One thought is to allow
    // only select options to be set from command line when a slurl
    // is specified. More work on the settings system is needed to
    // achieve this. For now...

    // *NOTE:Mani The command line parser parses tokens and is
    // setup to bail after parsing the '--url' option or the
    // first option specified without a '--option' flag (or
    // any other option that uses the 'last_option' setting -
    // see LLControlGroupCLP::configure())

    // What can happen is that someone can use IE (or potentially
    // other browsers) and do the rough equivalent of command
    // injection and steal passwords. Phoenix. SL-55321

    std::string starting_location;

    std::string cmd_line_login_location(gSavedSettings.getString("CmdLineLoginLocation"));
    if(! cmd_line_login_location.empty())
    {
        starting_location = cmd_line_login_location;
    }
    else
    {
        std::string default_login_location(gSavedSettings.getString("DefaultLoginLocation"));
        if (! default_login_location.empty())
        {
            starting_location = default_login_location;
        }
    }

    LLSLURL start_slurl;
    if (! starting_location.empty())
    {
        start_slurl = starting_location;
        LLStartUp::setStartSLURL(start_slurl);
        if(start_slurl.getType() == LLSLURL::LOCATION)
        {
            LLGridManager::getInstance()->setGridChoice(start_slurl.getGrid());
        }
    }

    // NextLoginLocation is set as a side effect of LLStartUp::setStartSLURL()
    std::string nextLoginLocation = gSavedSettings.getString( "NextLoginLocation" );
    if ( !nextLoginLocation.empty() )
    {
        LL_DEBUGS("AppInit")<<"set start from NextLoginLocation: "<<nextLoginLocation<<LL_ENDL;
        LLStartUp::setStartSLURL(LLSLURL(nextLoginLocation));
    }
    else if (   (   clp.hasOption("login") || clp.hasOption("autologin"))
             && gSavedSettings.getString("CmdLineLoginLocation").empty())
    {
        // If automatic login from command line with --login switch
        // init StartSLURL location.
        std::string start_slurl_setting = gSavedSettings.getString("LoginLocation");
        LL_DEBUGS("AppInit") << "start slurl setting '" << start_slurl_setting << "'" << LL_ENDL;
        LLStartUp::setStartSLURL(LLSLURL(start_slurl_setting));
    }
    else
    {
        // the login location will be set by the login panel (see LLPanelLogin)
    }

    //RN: if we received a URL, hand it off to the existing instance.
    // don't call anotherInstanceRunning() when doing URL handoff, as
    // it relies on checking a marker file which will not work when running
    // out of different directories

    if (start_slurl.isValid() &&
        (gSavedSettings.getBOOL("SLURLPassToOtherInstance")))
    {
        if (sendURLToOtherInstance(start_slurl.getSLURLString()))
        {
            // successfully handed off URL to existing instance, exit
            return false;
        }
    }

    // Display splash screen.  Must be after above check for previous
    // crash as this dialog is always frontmost.
    std::string splash_msg;
    LLStringUtil::format_map_t args;
    args["[APP_NAME]"] = LLTrans::getString("SECOND_LIFE");
    splash_msg = LLTrans::getString("StartupLoading", args);
    LLSplashScreen::show();
    LLSplashScreen::update(splash_msg);

    //LLVolumeMgr::initClass();
    LLVolumeMgr* volume_manager = new LLVolumeMgr();
    volume_manager->useMutex(); // LLApp and LLMutex magic must be manually enabled
    LLPrimitive::setVolumeManager(volume_manager);

    // Note: this is where we used to initialize gFeatureManagerp.

    gStartTime = totalTime();

    //
    // Set the name of the window
    //
    gWindowTitle = LLTrans::getString("APP_NAME");
#if LL_DEBUG
    gWindowTitle += std::string(" [DEBUG]");
#endif
    if (!gArgs.empty())
    {
    gWindowTitle += std::string(" ") + gArgs;
    }
    LLStringUtil::truncate(gWindowTitle, 255);

    //
    // Check for another instance of the app running
    // This happens AFTER LLSplashScreen::show(). That may or may not be
    // important.
    //
    if (mSecondInstance && !gSavedSettings.getBOOL("AllowMultipleViewers"))
    {
        OSMessageBox(
            LLTrans::getString("MBAlreadyRunning"),
            LLStringUtil::null,
            OSMB_OK);
        return false;
    }

    if (mSecondInstance)
    {
        // This is the second instance of SL. Mute voice,
        // but make sure the setting is *not* persisted.
        // Also see LLVivoxVoiceClient::voiceEnabled()
        LLControlVariable* enable_voice = gSavedSettings.getControl("EnableVoiceChat");
        if(enable_voice)
        {
            const BOOL DO_NOT_PERSIST = FALSE;
            enable_voice->setValue(LLSD(FALSE), DO_NOT_PERSIST);
        }
    }

    gLastRunVersion = gSavedSettings.getString("LastRunVersion");

    loadColorSettings();

    // Let anyone else who cares know that we've populated our settings
    // variables.
    for (const auto& key : LLControlGroup::key_snapshot())
    {
        // For each named instance of LLControlGroup, send an event saying
        // we've initialized an LLControlGroup instance by that name.
        LLEventPumps::instance().obtain("LLControlGroup").post(LLSDMap("init", key));
    }

    LLError::LLUserWarningMsg::setOutOfMemoryStrings(LLTrans::getString("MBOutOfMemoryTitle"), LLTrans::getString("MBOutOfMemoryErr"));

    return true; // Config was successful.
}

// The following logic is replicated in initConfiguration() (to be able to get
// some initial strings before we've finished initializing enough to know the
// current language) and also in init() (to initialize for real). Somehow it
// keeps growing, necessitating a method all its own.
void LLAppViewer::initStrings()
{
    std::string strings_file = "strings.xml";
    std::string strings_path_full = gDirUtilp->findSkinnedFilenameBaseLang(LLDir::XUI, strings_file);
    if (strings_path_full.empty() || !LLFile::isfile(strings_path_full))
    {
        if (strings_path_full.empty())
        {
            LL_WARNS() << "The file '" << strings_file << "' is not found" << LL_ENDL;
        }
        else
        {
            llstat st;
            int rc = LLFile::stat(strings_path_full, &st);
            if (rc != 0)
            {
                LL_WARNS() << "The file '" << strings_path_full << "' failed to get status. Error code: " << rc << LL_ENDL;
            }
            else if (S_ISDIR(st.st_mode))
            {
                LL_WARNS() << "The filename '" << strings_path_full << "' is a directory name" << LL_ENDL;
            }
            else
            {
                LL_WARNS() << "The filename '" << strings_path_full << "' doesn't seem to be a regular file name" << LL_ENDL;
            }
        }

        // initial check to make sure files are there failed
        gDirUtilp->dumpCurrentDirectories(LLError::LEVEL_WARN);
        LLError::LLUserWarningMsg::showMissingFiles();
        LL_ERRS() << "Viewer failed to find localization and UI files."
            << " Please reinstall viewer from https://secondlife.com/support/downloads"
            << " and contact https://support.secondlife.com if issue persists after reinstall." << LL_ENDL;
    }
    LLTransUtil::parseStrings(strings_file, default_trans_args);
    LLTransUtil::parseLanguageStrings("language_settings.xml");

    // parseStrings() sets up the LLTrans substitution table. Add this one item.
    LLTrans::setDefaultArg("[sourceid]", gSavedSettings.getString("sourceid"));

    // Now that we've set "[sourceid]", have to go back through
    // default_trans_args and reinitialize all those other keys because some
    // of them, in turn, reference "[sourceid]".
    for (const std::string& key : default_trans_args)
    {
        std::string brackets(key), nobrackets(key);
        // Invalid to inspect key[0] if key is empty(). But then, the entire
        // body of this loop is pointless if key is empty().
        if (key.empty())
            continue;

        if (key[0] != '[')
        {
            // key was passed without brackets. That means that 'nobrackets'
            // is correct but 'brackets' is not.
            brackets = STRINGIZE('[' << brackets << ']');
        }
        else
        {
            // key was passed with brackets. That means that 'brackets' is
            // correct but 'nobrackets' is not. Erase the left bracket.
            nobrackets.erase(0, 1);
            std::string::size_type length(nobrackets.length());
            if (length && nobrackets[length - 1] == ']')
            {
                nobrackets.erase(length - 1);
            }
        }
        // Calling LLTrans::getString() is what embeds the other default
        // translation strings into this one.
        LLTrans::setDefaultArg(brackets, LLTrans::getString(nobrackets));
    }
}

bool LLAppViewer::meetsRequirementsForMaximizedStart()
{
    bool maximizedOk = (gSysMemory.getPhysicalMemoryKB() >= U32Gigabytes(1));

    return maximizedOk;
}

bool LLAppViewer::initWindow()
{
    LL_INFOS("AppInit") << "Initializing window..." << LL_ENDL;

    // store setting in a global for easy access and modification
    gHeadlessClient = gSavedSettings.getBOOL("HeadlessClient");

    // always start windowed
    BOOL ignorePixelDepth = gSavedSettings.getBOOL("IgnorePixelDepth");

    LLViewerWindow::Params window_params;
    window_params
        .title(gWindowTitle)
        .name(VIEWER_WINDOW_CLASSNAME)
        .x(gSavedSettings.getS32("WindowX"))
        .y(gSavedSettings.getS32("WindowY"))
        .width(gSavedSettings.getU32("WindowWidth"))
        .height(gSavedSettings.getU32("WindowHeight"))
        .min_width(gSavedSettings.getU32("MinWindowWidth"))
        .min_height(gSavedSettings.getU32("MinWindowHeight"))
        .fullscreen(gSavedSettings.getBOOL("FullScreen"))
        .ignore_pixel_depth(ignorePixelDepth)
        .first_run(mIsFirstRun);

    gViewerWindow = new LLViewerWindow(window_params);

    LL_INFOS("AppInit") << "gViewerwindow created." << LL_ENDL;

    // Need to load feature table before cheking to start watchdog.
    bool use_watchdog = false;
    int watchdog_enabled_setting = gSavedSettings.getS32("WatchdogEnabled");
    if (watchdog_enabled_setting == -1)
    {
        use_watchdog = !LLFeatureManager::getInstance()->isFeatureAvailable("WatchdogDisabled");
    }
    else
    {
        // The user has explicitly set this setting; always use that value.
        use_watchdog = bool(watchdog_enabled_setting);
    }

    LL_INFOS("AppInit") << "watchdog"
                        << (use_watchdog ? " " : " NOT ")
                        << "enabled"
                        << " (setting = " << watchdog_enabled_setting << ")"
                        << LL_ENDL;

    if (use_watchdog)
    {
        LLWatchdog::getInstance()->init();
    }

    LLNotificationsUI::LLNotificationManager::getInstance();


#ifdef LL_DARWIN
    //Satisfy both MAINT-3135 (OSX 10.6 and earlier) MAINT-3288 (OSX 10.7 and later)
    LLOSInfo& os_info = LLOSInfo::instance();
    if (os_info.mMajorVer == 10 && os_info.mMinorVer < 7)
    {
        if ( os_info.mMinorVer == 6 && os_info.mBuild < 8 )
            gViewerWindow->getWindow()->setOldResize(true);
    }
#endif

    if (gSavedSettings.getBOOL("WindowMaximized"))
    {
        gViewerWindow->getWindow()->maximize();
    }

    //
    // Initialize GL stuff
    //

    if (mForceGraphicsLevel && (LLFeatureManager::instance().isValidGraphicsLevel(*mForceGraphicsLevel)))
    {
        LLFeatureManager::getInstance()->setGraphicsLevel(*mForceGraphicsLevel, false);
        gSavedSettings.setU32("RenderQualityPerformance", *mForceGraphicsLevel);
    }

    // Set this flag in case we crash while initializing GL
    gSavedSettings.setBOOL("RenderInitError", TRUE);
    gSavedSettings.saveToFile( gSavedSettings.getString("ClientSettingsFile"), TRUE );

    gPipeline.init();
    LL_INFOS("AppInit") << "gPipeline Initialized" << LL_ENDL;

    stop_glerror();
    gViewerWindow->initGLDefaults();

    gSavedSettings.setBOOL("RenderInitError", FALSE);
    gSavedSettings.saveToFile( gSavedSettings.getString("ClientSettingsFile"), TRUE );

    //If we have a startup crash, it's usually near GL initialization, so simulate that.
    if(gCrashOnStartup)
    {
        LLAppViewer::instance()->forceErrorLLError();
    }

    //
    // Determine if the window should start maximized on initial run based
    // on graphics capability
    //
    if (gSavedSettings.getBOOL("FirstLoginThisInstall") && meetsRequirementsForMaximizedStart())
    {
        LL_INFOS("AppInit") << "This client met the requirements for a maximized initial screen." << LL_ENDL;
        gSavedSettings.setBOOL("WindowMaximized", TRUE);
    }

    if (gSavedSettings.getBOOL("WindowMaximized"))
    {
        gViewerWindow->getWindow()->maximize();
    }

    LLUI::getInstance()->mWindow = gViewerWindow->getWindow();

    // Show watch cursor
    gViewerWindow->setCursor(UI_CURSOR_WAIT);

    // Finish view initialization
    gViewerWindow->initBase();

    // show viewer window
    //gViewerWindow->getWindow()->show();

    LL_INFOS("AppInit") << "Window initialization done." << LL_ENDL;

    return true;
}

bool LLAppViewer::isUpdaterMissing()
{
    return mUpdaterNotFound;
}

bool LLAppViewer::waitForUpdater()
{
    return !gSavedSettings.getBOOL("CmdLineSkipUpdater") && !mUpdaterNotFound && !gNonInteractive;
}

void LLAppViewer::writeDebugInfo(bool isStatic)
{
#if LL_WINDOWS && LL_BUGSPLAT
    // bugsplat does not create dump folder and debug logs are written directly
    // to logs folder, so it conflicts with main instance
    if (mSecondInstance)
    {
        return;
    }
#endif

    //Try to do the minimum when writing data during a crash.
    std::string* debug_filename;
    debug_filename = ( isStatic
        ? getStaticDebugFile()
        : getDynamicDebugFile() );

    LL_INFOS() << "Writing debug file " << *debug_filename << LL_ENDL;
    llofstream out_file(debug_filename->c_str());

    isStatic ?  LLSDSerialize::toPrettyXML(gDebugInfo, out_file)
             :  LLSDSerialize::toPrettyXML(gDebugInfo["Dynamic"], out_file);
}

LLSD LLAppViewer::getViewerInfo() const
{
    // The point of having one method build an LLSD info block and the other
    // construct the user-visible About string is to ensure that the same info
    // is available to a getInfo() caller as to the user opening
    // LLFloaterAbout.
    LLSD info;
    auto& versionInfo(LLVersionInfo::instance());
    // With GitHub builds, the build number is too big to fit in a 32-bit int,
    // and LLSD doesn't deal with integers wider than int. Use string.
    info["VIEWER_VERSION"] = llsd::array(versionInfo.getMajor(), versionInfo.getMinor(),
                                         versionInfo.getPatch(), stringize(versionInfo.getBuild()));
    info["VIEWER_VERSION_STR"] = versionInfo.getVersion();
    info["CHANNEL"] = versionInfo.getChannel();
    info["ADDRESS_SIZE"] = ADDRESS_SIZE;
    std::string build_config = versionInfo.getBuildConfig();
    if (build_config != "Release")
    {
        info["BUILD_CONFIG"] = build_config;
    }

    // return a URL to the release notes for this viewer, such as:
    // https://releasenotes.secondlife.com/viewer/2.1.0.123456.html
    std::string url = versionInfo.getReleaseNotes(); // VVM supplied
    if (url.empty())
    {
        url = LLTrans::getString("RELEASE_NOTES_BASE_URL");
        if (!LLStringUtil::endsWith(url, "/"))
            url += "/";
        url += "#" + LLURI::escape(versionInfo.getVersion()); // + ".html";
    }
    info["VIEWER_RELEASE_NOTES_URL"] = url;

    // Position
    LLViewerRegion* region = gAgent.getRegion();
    if (region)
    {
        LLVector3d pos = gAgent.getPositionGlobal();
        info["POSITION"] = ll_sd_from_vector3d(pos);
        info["POSITION_LOCAL"] = ll_sd_from_vector3(gAgent.getPosAgentFromGlobal(pos));
        info["REGION"] = gAgent.getRegion()->getName();

        boost::regex regex("\\.(secondlife|lindenlab)\\..*");
        info["HOSTNAME"] = boost::regex_replace(gAgent.getRegion()->getSimHostName(), regex, "");
        info["SERVER_VERSION"] = gLastVersionChannel;
        LLSLURL slurl;
        LLAgentUI::buildSLURL(slurl);
        info["SLURL"] = slurl.getSLURLString();
    }

    // CPU
    info["CPU"] = gSysCPU.getCPUString();
    info["MEMORY_MB"] = LLSD::Integer(gSysMemory.getPhysicalMemoryKB().valueInUnits<LLUnits::Megabytes>());
    // Moved hack adjustment to Windows memory size into llsys.cpp
    info["OS_VERSION"] = LLOSInfo::instance().getOSString();
    info["GRAPHICS_CARD_VENDOR"] = ll_safe_string((const char*)(glGetString(GL_VENDOR)));
    info["GRAPHICS_CARD"] = ll_safe_string((const char*)(glGetString(GL_RENDERER)));

#if LL_WINDOWS
    std::string drvinfo;

    if (gGLManager.mIsIntel)
    {
        drvinfo = gDXHardware.getDriverVersionWMI(LLDXHardware::GPU_INTEL);
    }
    else if (gGLManager.mIsNVIDIA)
    {
        drvinfo = gDXHardware.getDriverVersionWMI(LLDXHardware::GPU_NVIDIA);
    }
    else if (gGLManager.mIsAMD)
    {
        drvinfo = gDXHardware.getDriverVersionWMI(LLDXHardware::GPU_AMD);
    }

    if (drvinfo.empty())
    {
        // Generic/substitute windows driver? Unknown vendor?
        LL_WARNS("DriverVersion") << "Vendor based driver search failed, searching for any driver" << LL_ENDL;
        drvinfo = gDXHardware.getDriverVersionWMI(LLDXHardware::GPU_ANY);
    }

    if (!drvinfo.empty())
    {
        info["GRAPHICS_DRIVER_VERSION"] = drvinfo;
    }
    else
    {
        LL_WARNS("DriverVersion")<< "Cannot get driver version from getDriverVersionWMI" << LL_ENDL;
        LLSD driver_info = gDXHardware.getDisplayInfo();
        if (driver_info.has("DriverVersion"))
        {
            info["GRAPHICS_DRIVER_VERSION"] = driver_info["DriverVersion"];
        }
    }
#endif

    info["OPENGL_VERSION"] = ll_safe_string((const char*)(glGetString(GL_VERSION)));

    // Settings

    LLRect window_rect = gViewerWindow->getWindowRectRaw();
    info["WINDOW_WIDTH"] = window_rect.getWidth();
    info["WINDOW_HEIGHT"] = window_rect.getHeight();
    info["FONT_SIZE_ADJUSTMENT"] = gSavedSettings.getF32("FontScreenDPI");
    info["UI_SCALE"] = gSavedSettings.getF32("UIScaleFactor");
    info["DRAW_DISTANCE"] = gSavedSettings.getF32("RenderFarClip");
    info["NET_BANDWITH"] = gSavedSettings.getF32("ThrottleBandwidthKBPS");
    info["LOD_FACTOR"] = gSavedSettings.getF32("RenderVolumeLODFactor");
    info["RENDER_QUALITY"] = (F32)gSavedSettings.getU32("RenderQualityPerformance");
    info["TEXTURE_MEMORY"] = gGLManager.mVRAM;

#if LL_DARWIN
    info["HIDPI"] = gHiDPISupport;
#endif

    // Libraries

    info["J2C_VERSION"] = LLImageJ2C::getEngineInfo();
    bool want_fullname = true;
    info["AUDIO_DRIVER_VERSION"] = gAudiop ? LLSD(gAudiop->getDriverName(want_fullname)) : "Undefined";
    if(LLVoiceClient::getInstance()->voiceEnabled())
    {
        LLVoiceVersionInfo version = LLVoiceClient::getInstance()->getVersion();
        const std::string build_version = version.mBuildVersion;
        std::ostringstream version_string;
        if (std::equal(version.mBuildVersion.begin(), version.mBuildVersion.begin() + version.serverVersion.size(),
                       version.serverVersion.begin()))
        {  // Normal case: Show type and build version.
            version_string << version.voiceServerType << " " << version.mBuildVersion << std::endl;
        }
        else
        {  // Mismatch: Show both versions.
            version_string << version.voiceServerType << " " << version.serverVersion << "/" << version.mBuildVersion << std::endl;
        }
        info["VOICE_VERSION"] = version_string.str();
    }
    else
    {
        info["VOICE_VERSION"] = LLTrans::getString("NotConnected");
    }

#if LL_DARWIN || LL_LINUX
    std::ostringstream cef_ver_codec;
    cef_ver_codec << "Dullahan: ";
    cef_ver_codec << DULLAHAN_VERSION_MAJOR;
    cef_ver_codec << ".";
    cef_ver_codec << DULLAHAN_VERSION_MINOR;
    cef_ver_codec << ".";
    cef_ver_codec << DULLAHAN_VERSION_POINT;
    cef_ver_codec << ".";
    cef_ver_codec << DULLAHAN_VERSION_BUILD;

    cef_ver_codec << std::endl;
    cef_ver_codec << "  CEF: ";
    cef_ver_codec << CEF_VERSION;

    cef_ver_codec << std::endl;
    cef_ver_codec << "  Chromium: ";
    cef_ver_codec << CHROME_VERSION_MAJOR;
    cef_ver_codec << ".";
    cef_ver_codec << CHROME_VERSION_MINOR;
    cef_ver_codec << ".";
    cef_ver_codec << CHROME_VERSION_BUILD;
    cef_ver_codec << ".";
    cef_ver_codec << CHROME_VERSION_PATCH;

    info["LIBCEF_VERSION"] = cef_ver_codec.str();
#else
    info["LIBCEF_VERSION"] = "Undefined";
#endif

//#if !LL_LINUX
    std::ostringstream vlc_ver_codec;
    vlc_ver_codec << LIBVLC_VERSION_MAJOR;
    vlc_ver_codec << ".";
    vlc_ver_codec << LIBVLC_VERSION_MINOR;
    vlc_ver_codec << ".";
    vlc_ver_codec << LIBVLC_VERSION_REVISION;
    info["LIBVLC_VERSION"] = vlc_ver_codec.str();
/*
#else
    info["LIBVLC_VERSION"] = "Undefined";
#endif
*/

    S32 packets_in = LLViewerStats::instance().getRecording().getSum(LLStatViewer::PACKETS_IN);
    if (packets_in > 0)
    {
        info["PACKETS_LOST"] = LLViewerStats::instance().getRecording().getSum(LLStatViewer::PACKETS_LOST);
        info["PACKETS_IN"] = packets_in;
        info["PACKETS_PCT"] = 100.f*info["PACKETS_LOST"].asReal() / info["PACKETS_IN"].asReal();
    }

    if (mServerReleaseNotesURL.empty())
    {
        if (gAgent.getRegion())
        {
            info["SERVER_RELEASE_NOTES_URL"] = LLTrans::getString("RetrievingData");
        }
        else
        {
            info["SERVER_RELEASE_NOTES_URL"] = LLTrans::getString("NotConnected");
        }
    }
    else if (LLStringUtil::startsWith(mServerReleaseNotesURL, "http")) // it's an URL
    {
        info["SERVER_RELEASE_NOTES_URL"] = "[" + LLWeb::escapeURL(mServerReleaseNotesURL) + " " + LLTrans::getString("ReleaseNotes") + "]";
    }
    else
    {
        info["SERVER_RELEASE_NOTES_URL"] = mServerReleaseNotesURL;
    }

    // populate field for new local disk cache with some details
    info["DISK_CACHE_INFO"] = LLDiskCache::getInstance()->getCacheInfo();

    return info;
}

std::string LLAppViewer::getViewerInfoString(bool default_string) const
{
    std::ostringstream support;

    LLSD info(getViewerInfo());

    // Render the LLSD from getInfo() as a format_map_t
    LLStringUtil::format_map_t args;

    // allow the "Release Notes" URL label to be localized
    args["ReleaseNotes"] = LLTrans::getString("ReleaseNotes", default_string);

    for (LLSD::map_const_iterator ii(info.beginMap()), iend(info.endMap());
        ii != iend; ++ii)
    {
        if (! ii->second.isArray())
        {
            // Scalar value
            if (ii->second.isUndefined())
            {
                args[ii->first] = LLTrans::getString("none_text", default_string);
            }
            else
            {
                // don't forget to render value asString()
                args[ii->first] = ii->second.asString();
            }
        }
        else
        {
            // array value: build KEY_0, KEY_1 etc. entries
            for (LLSD::Integer n(0), size(ii->second.size()); n < size; ++n)
            {
                args[STRINGIZE(ii->first << '_' << n)] = ii->second[n].asString();
            }
        }
    }

    // Now build the various pieces
    support << LLTrans::getString("AboutHeader", args, default_string);
    if (info.has("BUILD_CONFIG"))
    {
        support << "\n" << LLTrans::getString("BuildConfig", args, default_string);
    }
    if (info.has("REGION"))
    {
        support << "\n\n" << LLTrans::getString("AboutPosition", args, default_string);
    }
    support << "\n\n" << LLTrans::getString("AboutSystem", args, default_string);
    support << "\n";
    if (info.has("GRAPHICS_DRIVER_VERSION"))
    {
        support << "\n" << LLTrans::getString("AboutDriver", args, default_string);
    }
    support << "\n" << LLTrans::getString("AboutOGL", args, default_string);
    support << "\n\n" << LLTrans::getString("AboutSettings", args, default_string);
#if LL_DARWIN
    support << "\n" << LLTrans::getString("AboutOSXHiDPI", args, default_string);
#endif
    support << "\n\n" << LLTrans::getString("AboutLibs", args, default_string);
    if (info.has("COMPILER"))
    {
        support << "\n" << LLTrans::getString("AboutCompiler", args, default_string);
    }
    if (info.has("PACKETS_IN"))
    {
        support << '\n' << LLTrans::getString("AboutTraffic", args, default_string);
    }

    // SLT timestamp
    LLSD substitution;
    substitution["datetime"] = (S32)time(NULL);//(S32)time_corrected();
    support << "\n" << LLTrans::getString("AboutTime", substitution, default_string);

    return support.str();
}

void LLAppViewer::cleanupSavedSettings()
{
    gSavedSettings.setBOOL("MouseSun", FALSE);

    gSavedSettings.setBOOL("UseEnergy", TRUE);              // force toggle to turn off, since sends message to simulator

    gSavedSettings.setBOOL("DebugWindowProc", gDebugWindowProc);

    gSavedSettings.setBOOL("ShowObjectUpdates", gShowObjectUpdates);

    if (gDebugView)
    {
        gSavedSettings.setBOOL("ShowDebugConsole", gDebugView->mDebugConsolep->getVisible());
    }

    // save window position if not maximized
    // as we don't track it in callbacks
    if(NULL != gViewerWindow)
    {
        BOOL maximized = gViewerWindow->getWindow()->getMaximized();
        if (!maximized)
        {
            LLCoordScreen window_pos;

            if (gViewerWindow->getWindow()->getPosition(&window_pos))
            {
                gSavedSettings.setS32("WindowX", window_pos.mX);
                gSavedSettings.setS32("WindowY", window_pos.mY);
            }
        }
    }

    gSavedSettings.setF32("MapScale", LLWorldMapView::getScaleSetting());

    // Some things are cached in LLAgent.
    if (gAgent.isInitialized())
    {
        gSavedSettings.setF32("RenderFarClip", gAgentCamera.mDrawDistance);
    }
}

void LLAppViewer::removeCacheFiles(const std::string& file_mask)
{
    gDirUtilp->deleteFilesInDir(gDirUtilp->getExpandedFilename(LL_PATH_CACHE, ""), file_mask);
}

void LLAppViewer::writeSystemInfo()
{

    if (! gDebugInfo.has("Dynamic") )
        gDebugInfo["Dynamic"] = LLSD::emptyMap();

#if LL_WINDOWS && !LL_BUGSPLAT
    gDebugInfo["SLLog"] = gDirUtilp->getExpandedFilename(LL_PATH_DUMP,"SecondLife.log");
#else
    //Not ideal but sufficient for good reporting.
    gDebugInfo["SLLog"] = gDirUtilp->getExpandedFilename(LL_PATH_LOGS,"SecondLife.old");  //LLError::logFileName();
#endif

    gDebugInfo["ClientInfo"]["Name"] = LLVersionInfo::instance().getChannel();
    gDebugInfo["ClientInfo"]["MajorVersion"] = LLVersionInfo::instance().getMajor();
    gDebugInfo["ClientInfo"]["MinorVersion"] = LLVersionInfo::instance().getMinor();
    gDebugInfo["ClientInfo"]["PatchVersion"] = LLVersionInfo::instance().getPatch();
    gDebugInfo["ClientInfo"]["BuildVersion"] = std::to_string(LLVersionInfo::instance().getBuild());
    gDebugInfo["ClientInfo"]["AddressSize"] = LLVersionInfo::instance().getAddressSize();

    gDebugInfo["CAFilename"] = gDirUtilp->getCAFile();

    gDebugInfo["CPUInfo"]["CPUString"] = gSysCPU.getCPUString();
    gDebugInfo["CPUInfo"]["CPUFamily"] = gSysCPU.getFamily();
    gDebugInfo["CPUInfo"]["CPUMhz"] = (S32)gSysCPU.getMHz();
    gDebugInfo["CPUInfo"]["CPUAltivec"] = gSysCPU.hasAltivec();
    gDebugInfo["CPUInfo"]["CPUSSE"] = gSysCPU.hasSSE();
    gDebugInfo["CPUInfo"]["CPUSSE2"] = gSysCPU.hasSSE2();

    gDebugInfo["RAMInfo"]["Physical"] = LLSD::Integer(gSysMemory.getPhysicalMemoryKB().value());
    gDebugInfo["RAMInfo"]["Allocated"] = LLSD::Integer(gMemoryAllocated.valueInUnits<LLUnits::Kilobytes>());
    gDebugInfo["OSInfo"] = LLOSInfo::instance().getOSStringSimple();

    // The user is not logged on yet, but record the current grid choice login url
    // which may have been the intended grid.
    gDebugInfo["GridName"] = LLGridManager::getInstance()->getGridId();

    // *FIX:Mani - move this down in llappviewerwin32
#ifdef LL_WINDOWS
    DWORD thread_id = GetCurrentThreadId();
    gDebugInfo["MainloopThreadID"] = (S32)thread_id;
#endif

#ifndef LL_BUGSPLAT
    // "CrashNotHandled" is set here, while things are running well,
    // in case of a freeze. If there is a freeze, the crash logger will be launched
    // and can read this value from the debug_info.log.
    gDebugInfo["CrashNotHandled"] = LLSD::Boolean(true);
#else // LL_BUGSPLAT
    // "CrashNotHandled" is obsolete; it used (not very successsfully)
    // to try to distinguish crashes from freezes - the intent here to to avoid calling it a freeze
    gDebugInfo["CrashNotHandled"] = LLSD::Boolean(false);
#endif // ! LL_BUGSPLAT

    // Insert crash host url (url to post crash log to) if configured. This insures
    // that the crash report will go to the proper location in the case of a
    // prior freeze.
    std::string crashHostUrl = gSavedSettings.get<std::string>("CrashHostUrl");
    if(crashHostUrl != "")
    {
        gDebugInfo["CrashHostUrl"] = crashHostUrl;
    }

    // Dump some debugging info
    LL_INFOS("SystemInfo") << "Application: " << LLTrans::getString("APP_NAME") << LL_ENDL;
    LL_INFOS("SystemInfo") << "Version: " << LLVersionInfo::instance().getChannelAndVersion() << LL_ENDL;

    // Dump the local time and time zone
    time_t now;
    time(&now);
    char tbuffer[256];      /* Flawfinder: ignore */
    strftime(tbuffer, 256, "%Y-%m-%dT%H:%M:%S %Z", localtime(&now));
    LL_INFOS("SystemInfo") << "Local time: " << tbuffer << LL_ENDL;

    // query some system information
    LL_INFOS("SystemInfo") << "CPU info:\n" << gSysCPU << LL_ENDL;
    LL_INFOS("SystemInfo") << "Memory info:\n" << gSysMemory << LL_ENDL;
    LL_INFOS("SystemInfo") << "OS: " << LLOSInfo::instance().getOSStringSimple() << LL_ENDL;
    LL_INFOS("SystemInfo") << "OS info: " << LLOSInfo::instance() << LL_ENDL;

    gDebugInfo["SettingsFilename"] = gSavedSettings.getString("ClientSettingsFile");
    gDebugInfo["ViewerExePath"] = gDirUtilp->getExecutablePathAndName();
    gDebugInfo["CurrentPath"] = gDirUtilp->getCurPath();
    gDebugInfo["FirstLogin"] = LLSD::Boolean(gAgent.isFirstLogin());
    gDebugInfo["FirstRunThisInstall"] = gSavedSettings.getBOOL("FirstRunThisInstall");
    gDebugInfo["StartupState"] = LLStartUp::getStartupStateString();

    if (gViewerWindow)
    {
    std::vector<std::string> resolutions = gViewerWindow->getWindow()->getDisplaysResolutionList();
    for (auto res_iter : resolutions)
    {
        gDebugInfo["DisplayInfo"].append(res_iter);
    }
    }

    writeDebugInfo(); // Save out debug_info.log early, in case of crash.
}

#ifdef LL_WINDOWS
//For whatever reason, in Windows when using OOP server for breakpad, the callback to get the
//name of the dump file is not getting triggered by the breakpad library.   Unfortunately they
//also didn't see fit to provide a simple query request across the pipe to get this name either.
//Since we are putting our output in a runtime generated directory and we know the header data in
//the dump format, we can however use the following hack to identify our file.
// TODO make this a member function.
void getFileList()
{
    std::stringstream filenames;

    typedef std::vector<std::string> vec;
    std::string pathname = gDirUtilp->getExpandedFilename(LL_PATH_DUMP,"");
    vec file_vec = gDirUtilp->getFilesInDir(pathname);
    for(vec::const_iterator iter=file_vec.begin(); iter!=file_vec.end(); ++iter)
    {
        filenames << *iter << " ";
        if ( ( iter->length() > 30 ) && (iter->rfind(".dmp") == (iter->length()-4) ) )
        {
            std::string fullname = pathname + *iter;
            llifstream fdat( fullname.c_str(), std::ifstream::binary);
            if (fdat)
            {
                char buf[5];
                fdat.read(buf,4);
                fdat.close();
                if (!strncmp(buf,"MDMP",4))
                {
                    gDebugInfo["Dynamic"]["MinidumpPath"] = fullname;
                    break;
                }
            }
        }
    }
    filenames << std::endl;
    gDebugInfo["Dynamic"]["DumpDirContents"] = filenames.str();
}
#endif

// static
void LLAppViewer::recordMarkerVersion(LLAPRFile& marker_file)
{
    std::string marker_version(LLVersionInfo::instance().getChannelAndVersion());
    if ( marker_version.length() > MAX_MARKER_LENGTH )
    {
        LL_WARNS_ONCE("MarkerFile") << "Version length ("<< marker_version.length()<< ")"
                                    << " greater than maximum (" << MAX_MARKER_LENGTH << ")"
                                    << ": marker matching may be incorrect"
                                    << LL_ENDL;
    }

    // record the viewer version in the marker file
    marker_file.write(marker_version.data(), marker_version.length());
}

bool LLAppViewer::markerIsSameVersion(const std::string& marker_name) const
{
    bool sameVersion = false;

    std::string my_version(LLVersionInfo::instance().getChannelAndVersion());
    char marker_version[MAX_MARKER_LENGTH];
    S32  marker_version_length;

    LLAPRFile marker_file;
    marker_file.open(marker_name, LL_APR_RB);
    if (marker_file.getFileHandle())
    {
        marker_version_length = marker_file.read(marker_version, sizeof(marker_version));
        std::string marker_string(marker_version, marker_version_length);
        if ( 0 == my_version.compare( 0, my_version.length(), marker_version, 0, marker_version_length ) )
        {
            sameVersion = true;
        }
        LL_DEBUGS("MarkerFile") << "Compare markers for '" << marker_name << "': "
                                << "\n   mine '" << my_version    << "'"
                                << "\n marker '" << marker_string << "'"
                                << "\n " << ( sameVersion ? "same" : "different" ) << " version"
                                << LL_ENDL;
        marker_file.close();
    }
    return sameVersion;
}

void LLAppViewer::processMarkerFiles()
{
    //We've got 4 things to test for here
    // - Other Process Running (SecondLife.exec_marker present, locked)
    // - Freeze (SecondLife.exec_marker present, not locked)
    // - LLError Crash (SecondLife.llerror_marker present)
    // - Other Crash (SecondLife.error_marker present)
    // These checks should also remove these files for the last 2 cases if they currently exist

    std::ostringstream marker_log_stream;
    bool marker_is_same_version = true;
    // first, look for the marker created at startup and deleted on a clean exit
    mMarkerFileName = gDirUtilp->getExpandedFilename(LL_PATH_LOGS,MARKER_FILE_NAME);
    if (LLAPRFile::isExist(mMarkerFileName, NULL, LL_APR_RB))
    {
        // File exists...
        // first, read it to see if it was created by the same version (we need this later)
        marker_is_same_version = markerIsSameVersion(mMarkerFileName);

        // now test to see if this file is locked by a running process (try to open for write)
        marker_log_stream << "Checking exec marker file for lock...";
        mMarkerFile.open(mMarkerFileName, LL_APR_WB);
        apr_file_t* fMarker = mMarkerFile.getFileHandle() ;
        if (!fMarker)
        {
            marker_log_stream << "Exec marker file open failed - assume it is locked.";
            mSecondInstance = true; // lock means that instance is running.
        }
        else
        {
            // We were able to open it, now try to lock it ourselves...
            if (apr_file_lock(fMarker, APR_FLOCK_NONBLOCK | APR_FLOCK_EXCLUSIVE) != APR_SUCCESS)
            {
                marker_log_stream << "Locking exec marker failed.";
                mSecondInstance = true; // lost a race? be conservative
            }
            else
            {
                // No other instances; we've locked this file now, so record our version; delete on quit.
                recordMarkerVersion(mMarkerFile);
                marker_log_stream << "Exec marker file existed but was not locked; rewritten.";
            }
        }
        initLoggingAndGetLastDuration();

        std::string marker_log_msg(marker_log_stream.str());
        LL_INFOS("MarkerFile") << marker_log_msg << LL_ENDL;

        if (mSecondInstance)
        {
            LL_INFOS("MarkerFile") << "Exec marker '"<< mMarkerFileName << "' owned by another instance" << LL_ENDL;
        }
        else if (marker_is_same_version)
        {
            // the file existed, is ours, and matched our version, so we can report on what it says
            LL_INFOS("MarkerFile") << "Exec marker '"<< mMarkerFileName << "' found; last exec crashed" << LL_ENDL;
            gLastExecEvent = LAST_EXEC_OTHER_CRASH;
        }
        else
        {
            LL_INFOS("MarkerFile") << "Exec marker '"<< mMarkerFileName << "' found, but versions did not match" << LL_ENDL;
        }
    }
    else // marker did not exist... last exec (if any) did not freeze
    {
        initLoggingAndGetLastDuration();
        // Create the marker file for this execution & lock it; it will be deleted on a clean exit
        apr_status_t s;
        s = mMarkerFile.open(mMarkerFileName, LL_APR_WB, TRUE);

        if (s == APR_SUCCESS && mMarkerFile.getFileHandle())
        {
            LL_DEBUGS("MarkerFile") << "Exec marker file '"<< mMarkerFileName << "' created." << LL_ENDL;
            if (APR_SUCCESS == apr_file_lock(mMarkerFile.getFileHandle(), APR_FLOCK_NONBLOCK | APR_FLOCK_EXCLUSIVE))
            {
                recordMarkerVersion(mMarkerFile);
                LL_DEBUGS("MarkerFile") << "Exec marker file locked." << LL_ENDL;
            }
            else
            {
                LL_WARNS("MarkerFile") << "Exec marker file cannot be locked." << LL_ENDL;
            }
        }
        else
        {
            LL_WARNS("MarkerFile") << "Failed to create exec marker file '"<< mMarkerFileName << "'." << LL_ENDL;
        }
    }

    // now check for cases in which the exec marker may have been cleaned up by crash handlers

    // check for any last exec event report based on whether or not it happened during logout
    // (the logout marker is created when logout begins)
    std::string logout_marker_file =  gDirUtilp->getExpandedFilename(LL_PATH_LOGS, LOGOUT_MARKER_FILE_NAME);
    if(LLAPRFile::isExist(logout_marker_file, NULL, LL_APR_RB))
    {
        if (markerIsSameVersion(logout_marker_file))
        {
            gLastExecEvent = LAST_EXEC_LOGOUT_FROZE;
            LL_INFOS("MarkerFile") << "Logout crash marker '"<< logout_marker_file << "', changing LastExecEvent to LOGOUT_FROZE" << LL_ENDL;
        }
        else
        {
            LL_INFOS("MarkerFile") << "Logout crash marker '"<< logout_marker_file << "' found, but versions did not match" << LL_ENDL;
        }
        LLAPRFile::remove(logout_marker_file);
    }
    // further refine based on whether or not a marker created during an llerr crash is found
    std::string llerror_marker_file = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, LLERROR_MARKER_FILE_NAME);
    if(LLAPRFile::isExist(llerror_marker_file, NULL, LL_APR_RB))
    {
        if (markerIsSameVersion(llerror_marker_file))
        {
            if ( gLastExecEvent == LAST_EXEC_LOGOUT_FROZE )
            {
                gLastExecEvent = LAST_EXEC_LOGOUT_CRASH;
                LL_INFOS("MarkerFile") << "LLError marker '"<< llerror_marker_file << "' crashed, setting LastExecEvent to LOGOUT_CRASH" << LL_ENDL;
            }
            else
            {
                gLastExecEvent = LAST_EXEC_LLERROR_CRASH;
                LL_INFOS("MarkerFile") << "LLError marker '"<< llerror_marker_file << "' crashed, setting LastExecEvent to LLERROR_CRASH" << LL_ENDL;
            }
        }
        else
        {
            LL_INFOS("MarkerFile") << "LLError marker '"<< llerror_marker_file << "' found, but versions did not match" << LL_ENDL;
        }
        LLAPRFile::remove(llerror_marker_file);
    }
    // and last refine based on whether or not a marker created during a non-llerr crash is found
    std::string error_marker_file = gDirUtilp->getExpandedFilename(LL_PATH_LOGS, ERROR_MARKER_FILE_NAME);
    if(LLAPRFile::isExist(error_marker_file, NULL, LL_APR_RB))
    {
        if (markerIsSameVersion(error_marker_file))
        {
            if (gLastExecEvent == LAST_EXEC_LOGOUT_FROZE)
            {
                gLastExecEvent = LAST_EXEC_LOGOUT_CRASH;
                LL_INFOS("MarkerFile") << "Error marker '"<< error_marker_file << "' crashed, setting LastExecEvent to LOGOUT_CRASH" << LL_ENDL;
            }
            else
            {
                gLastExecEvent = LAST_EXEC_OTHER_CRASH;
                LL_INFOS("MarkerFile") << "Error marker '"<< error_marker_file << "' crashed, setting LastExecEvent to " << gLastExecEvent << LL_ENDL;
            }
        }
        else
        {
            LL_INFOS("MarkerFile") << "Error marker '"<< error_marker_file << "' marker found, but versions did not match" << LL_ENDL;
        }
        LLAPRFile::remove(error_marker_file);
    }
}

void LLAppViewer::removeMarkerFiles()
{
    if (!mSecondInstance)
    {
        if (mMarkerFile.getFileHandle())
        {
            mMarkerFile.close() ;
            LLAPRFile::remove( mMarkerFileName );
            LL_DEBUGS("MarkerFile") << "removed exec marker '"<<mMarkerFileName<<"'"<< LL_ENDL;
        }
        else
        {
            LL_WARNS("MarkerFile") << "marker '"<<mMarkerFileName<<"' not open"<< LL_ENDL;
        }

        if (mLogoutMarkerFile.getFileHandle())
        {
            mLogoutMarkerFile.close();
            LLAPRFile::remove( mLogoutMarkerFileName );
            LL_DEBUGS("MarkerFile") << "removed logout marker '"<<mLogoutMarkerFileName<<"'"<< LL_ENDL;
        }
        else
        {
            LL_WARNS("MarkerFile") << "logout marker '"<<mLogoutMarkerFileName<<"' not open"<< LL_ENDL;
        }
    }
    else
    {
        LL_WARNS("MarkerFile") << "leaving markers because this is a second instance" << LL_ENDL;
    }
}

void LLAppViewer::removeDumpDir()
{
    //Call this routine only on clean exit.  Crash reporter will clean up
    //its locking table for us.
    if (gDirUtilp->dumpDirExists()) // Check if dump dir was created this run
    {
        std::string dump_dir = gDirUtilp->getExpandedFilename(LL_PATH_DUMP, "");
        gDirUtilp->deleteDirAndContents(dump_dir);
    }

    if (mSecondInstance && !isError())
    {
        std::string log_filename = LLError::logFileName();
        LLError::logToFile("");
        LLFile::remove(log_filename);
    }
}

void LLAppViewer::forceQuit()
{
    LLApp::setQuitting();
}

//TODO: remove
void LLAppViewer::fastQuit(S32 error_code)
{
    // finish pending transfers
    flushLFSIO();
    // let sim know we're logging out
    sendLogoutRequest();
    // flush network buffers by shutting down messaging system
    end_messaging_system();
    // figure out the error code
    S32 final_error_code = error_code ? error_code : (S32)isError();
    // this isn't a crash
    removeMarkerFiles();
    // get outta here
    _exit(final_error_code);
}

void LLAppViewer::requestQuit()
{
    LL_INFOS() << "requestQuit" << LL_ENDL;

    LLViewerRegion* region = gAgent.getRegion();

    if( (LLStartUp::getStartupState() < STATE_STARTED) || !region )
    {
        // If we have a region, make some attempt to send a logout request first.
        // This prevents the halfway-logged-in avatar from hanging around inworld for a couple minutes.
        if(region)
        {
            sendLogoutRequest();
        }

        // Quit immediately
        forceQuit();
        return;
    }

    // Try to send metrics back to the grid
    metricsSend(!gDisconnected);

    // Try to send last batch of avatar rez metrics.
    if (!gDisconnected && isAgentAvatarValid())
    {
        gAgentAvatarp->updateAvatarRezMetrics(true); // force a last packet to be sent.
    }

    LLHUDEffectSpiral *effectp = (LLHUDEffectSpiral*)LLHUDManager::getInstance()->createViewerEffect(LLHUDObject::LL_HUD_EFFECT_POINT, TRUE);
    effectp->setPositionGlobal(gAgent.getPositionGlobal());
    effectp->setColor(LLColor4U(gAgent.getEffectColor()));
    LLHUDManager::getInstance()->sendEffects();
    effectp->markDead() ;//remove it.

    // Attempt to close all floaters that might be
    // editing things.
    if (gFloaterView)
    {
        // application is quitting
        gFloaterView->closeAllChildren(true);
    }

    // Send preferences once, when exiting
    bool include_preferences = true;
    send_viewer_stats(include_preferences);

    gLogoutTimer.reset();
    mQuitRequested = true;
}

static bool finish_quit(const LLSD& notification, const LLSD& response)
{
    S32 option = LLNotificationsUtil::getSelectedOption(notification, response);

    if (option == 0)
    {
        LLAppViewer::instance()->requestQuit();
    }
    return false;
}
static LLNotificationFunctorRegistration finish_quit_reg("ConfirmQuit", finish_quit);

void LLAppViewer::userQuit()
{
    LL_INFOS() << "User requested quit" << LL_ENDL;
    if (gDisconnected
        || !gViewerWindow
        || !gViewerWindow->getProgressView()
        || gViewerWindow->getProgressView()->getVisible())
    {
        requestQuit();
    }
    else
    {
        LLNotificationsUtil::add("ConfirmQuit");
    }
}

static bool finish_early_exit(const LLSD& notification, const LLSD& response)
{
    LLAppViewer::instance()->forceQuit();
    return false;
}

void LLAppViewer::earlyExit(const std::string& name, const LLSD& substitutions)
{
    LL_WARNS() << "app_early_exit: " << name << LL_ENDL;
    gDoDisconnect = TRUE;
    LLNotificationsUtil::add(name, substitutions, LLSD(), finish_early_exit);
}

// case where we need the viewer to exit without any need for notifications
void LLAppViewer::earlyExitNoNotify()
{
    LL_WARNS() << "app_early_exit with no notification: " << LL_ENDL;
    gDoDisconnect = TRUE;
    finish_early_exit( LLSD(), LLSD() );
}

void LLAppViewer::abortQuit()
{
    LL_INFOS() << "abortQuit()" << LL_ENDL;
    mQuitRequested = false;
}

void LLAppViewer::migrateCacheDirectory()
{
#if LL_WINDOWS || LL_DARWIN
    // NOTE: (Nyx) as of 1.21, cache for mac is moving to /library/caches/SecondLife from
    // /library/application support/SecondLife/cache This should clear/delete the old dir.

    // As of 1.23 the Windows cache moved from
    //   C:\Documents and Settings\James\Application Support\SecondLife\cache
    // to
    //   C:\Documents and Settings\James\Local Settings\Application Support\SecondLife
    //
    // The Windows Vista equivalent is from
    //   C:\Users\James\AppData\Roaming\SecondLife\cache
    // to
    //   C:\Users\James\AppData\Local\SecondLife
    //
    // Note the absence of \cache on the second path.  James.

    // Only do this once per fresh install of this version.
    if (gSavedSettings.getBOOL("MigrateCacheDirectory"))
    {
        gSavedSettings.setBOOL("MigrateCacheDirectory", FALSE);

        std::string old_cache_dir = gDirUtilp->add(gDirUtilp->getOSUserAppDir(), "cache");
        std::string new_cache_dir = gDirUtilp->getCacheDir(true);

        if (gDirUtilp->fileExists(old_cache_dir))
        {
            LL_INFOS() << "Migrating cache from " << old_cache_dir << " to " << new_cache_dir << LL_ENDL;

            // Migrate inventory cache to avoid pain to inventory database after mass update
            S32 file_count = 0;
            std::string file_name;
            std::string mask = "*.*";

            LLDirIterator iter(old_cache_dir, mask);
            while (iter.next(file_name))
            {
                if (file_name == "." || file_name == "..") continue;
                std::string source_path = gDirUtilp->add(old_cache_dir, file_name);
                std::string dest_path = gDirUtilp->add(new_cache_dir, file_name);
                if (!LLFile::rename(source_path, dest_path))
                {
                    file_count++;
                }
            }
            LL_INFOS() << "Moved " << file_count << " files" << LL_ENDL;

            // Nuke the old cache
            gDirUtilp->setCacheDir(old_cache_dir);
            purgeCache();
            gDirUtilp->setCacheDir(new_cache_dir);

#if LL_DARWIN
            // Clean up Mac files not deleted by removing *.*
            std::string ds_store = old_cache_dir + "/.DS_Store";
            if (gDirUtilp->fileExists(ds_store))
            {
                LLFile::remove(ds_store);
            }
#endif
            if (LLFile::rmdir(old_cache_dir) != 0)
            {
                LL_WARNS() << "could not delete old cache directory " << old_cache_dir << LL_ENDL;
            }
        }
    }
#endif // LL_WINDOWS || LL_DARWIN
}

//static
U32 LLAppViewer::getTextureCacheVersion()
{
    // Viewer texture cache version, change if the texture cache format changes.
    // 2021-03-10 Bumping up by one to help obviate texture cache issues with
    //            Simple Cache Viewer - see SL-14985 for more information
    //const U32 TEXTURE_CACHE_VERSION = 8;
    const U32 TEXTURE_CACHE_VERSION = 9;

    return TEXTURE_CACHE_VERSION ;
}

//static
U32 LLAppViewer::getDiskCacheVersion()
{
    // Viewer disk cache version intorduced in Simple Cache Viewer, change if the cache format changes.
    const U32 DISK_CACHE_VERSION = 1;

    return DISK_CACHE_VERSION ;
}

//static
U32 LLAppViewer::getObjectCacheVersion()
{
    // Viewer object cache version, change if object update
    // format changes. JC
    const U32 INDRA_OBJECT_CACHE_VERSION = 17;

    return INDRA_OBJECT_CACHE_VERSION;
}

bool LLAppViewer::initCache()
{
    mPurgeCache = false;
    BOOL read_only = mSecondInstance ? TRUE : FALSE;
    LLAppViewer::getTextureCache()->setReadOnly(read_only) ;
    LLVOCache::initParamSingleton(read_only);

    // initialize the new disk cache using saved settings
    const std::string cache_dir_name = gSavedSettings.getString("DiskCacheDirName");

    const U32 MB = 1024 * 1024;
    const uintmax_t MIN_CACHE_SIZE = 256 * MB;
    const uintmax_t MAX_CACHE_SIZE = 9984ll * MB;
    const uintmax_t setting_cache_total_size = uintmax_t(gSavedSettings.getU32("CacheSize")) * MB;
    const uintmax_t cache_total_size = llclamp(setting_cache_total_size, MIN_CACHE_SIZE, MAX_CACHE_SIZE);
    const F64 disk_cache_percent = gSavedSettings.getF32("DiskCachePercentOfTotal");
    const F64 texture_cache_percent = 100.0 - disk_cache_percent;

    // note that the maximum size of this cache is defined as a percentage of the
    // total cache size - the 'CacheSize' pref - for all caches.
    const uintmax_t disk_cache_size = uintmax_t(cache_total_size * disk_cache_percent / 100);
    const bool enable_cache_debug_info = gSavedSettings.getBOOL("EnableDiskCacheDebugInfo");

    bool texture_cache_mismatch = false;
    bool remove_vfs_files = false;
    if (gSavedSettings.getS32("LocalCacheVersion") != LLAppViewer::getTextureCacheVersion())
    {
        texture_cache_mismatch = true;
        if(!read_only)
        {
            gSavedSettings.setS32("LocalCacheVersion", LLAppViewer::getTextureCacheVersion());

            //texture cache version was bumped up in Simple Cache Viewer, and at this point old vfs files are not needed
            remove_vfs_files = true;
        }
    }

    if(!read_only)
    {
        // Purge cache if user requested it
        if (gSavedSettings.getBOOL("PurgeCacheOnStartup") ||
            gSavedSettings.getBOOL("PurgeCacheOnNextStartup"))
        {
            LL_INFOS("AppCache") << "Startup cache purge requested: " << (gSavedSettings.getBOOL("PurgeCacheOnStartup") ? "ALWAYS" : "ONCE") << LL_ENDL;
            gSavedSettings.setBOOL("PurgeCacheOnNextStartup", false);
            mPurgeCache = true;
            // STORM-1141 force purgeAllTextures to get called to prevent a crash here. -brad
            texture_cache_mismatch = true;
        }

        // We have moved the location of the cache directory over time.
        migrateCacheDirectory();

        // Setup and verify the cache location
        std::string cache_location = gSavedSettings.getString("CacheLocation");
        std::string new_cache_location = gSavedSettings.getString("NewCacheLocation");
        if (new_cache_location != cache_location)
        {
            LL_INFOS("AppCache") << "Cache location changed, cache needs purging" << LL_ENDL;
            gDirUtilp->setCacheDir(gSavedSettings.getString("CacheLocation"));
            purgeCache(); // purge old cache
            gDirUtilp->deleteDirAndContents(gDirUtilp->getExpandedFilename(LL_PATH_CACHE, cache_dir_name));
            gSavedSettings.setString("CacheLocation", new_cache_location);
            gSavedSettings.setString("CacheLocationTopFolder", gDirUtilp->getBaseFileName(new_cache_location));
        }
    }

    if (!gDirUtilp->setCacheDir(gSavedSettings.getString("CacheLocation")))
    {
        LL_WARNS("AppCache") << "Unable to set cache location" << LL_ENDL;
        gSavedSettings.setString("CacheLocation", "");
        gSavedSettings.setString("CacheLocationTopFolder", "");
    }

    const std::string cache_dir = gDirUtilp->getExpandedFilename(LL_PATH_CACHE, cache_dir_name);
    LLDiskCache::initParamSingleton(cache_dir, disk_cache_size, enable_cache_debug_info);

    if (!read_only)
    {
        if (gSavedSettings.getS32("DiskCacheVersion") != LLAppViewer::getDiskCacheVersion())
        {
            LLDiskCache::getInstance()->clearCache();
            remove_vfs_files = true;
            gSavedSettings.setS32("DiskCacheVersion", LLAppViewer::getDiskCacheVersion());
        }

        if (remove_vfs_files)
        {
            LLDiskCache::getInstance()->removeOldVFSFiles();
        }

        if (mPurgeCache)
        {
        LLSplashScreen::update(LLTrans::getString("StartupClearingCache"));
        purgeCache();

            // clear the new C++ file system based cache
            LLDiskCache::getInstance()->clearCache();
    }
        else
        {
            // purge excessive files from the new file system based cache
            LLDiskCache::getInstance()->purge();
        }
    }
    LLAppViewer::getPurgeDiskCacheThread()->start();

    LLSplashScreen::update(LLTrans::getString("StartupInitializingTextureCache"));

    // Init the texture cache
    // Allocate the remaining percent which is not allocated to the disk cache
    const S64 texture_cache_size = S64(cache_total_size * texture_cache_percent / 100);

    LLAppViewer::getTextureCache()->initCache(LL_PATH_CACHE, texture_cache_size, texture_cache_mismatch);

    const U32 CACHE_NUMBER_OF_REGIONS_FOR_OBJECTS = 128;
    LLVOCache::getInstance()->initCache(LL_PATH_CACHE, CACHE_NUMBER_OF_REGIONS_FOR_OBJECTS, getObjectCacheVersion());

    return true;
}

void LLAppViewer::addOnIdleCallback(const boost::function<void()>& cb)
{
    gMainloopWork.post(cb);
}

void LLAppViewer::loadKeyBindings()
{
    std::string key_bindings_file = gDirUtilp->getExpandedFilename(LL_PATH_USER_SETTINGS, "key_bindings.xml");
    if (!gDirUtilp->fileExists(key_bindings_file) || !gViewerInput.loadBindingsXML(key_bindings_file))
    {
        // Failed to load custom bindings, try default ones
        key_bindings_file = gDirUtilp->getExpandedFilename(LL_PATH_APP_SETTINGS, "key_bindings.xml");
        if (!gViewerInput.loadBindingsXML(key_bindings_file))
        {
            LLError::LLUserWarningMsg::showMissingFiles();
            LL_ERRS("InitInfo") << "Unable to open default key bindings from " << key_bindings_file << LL_ENDL;
        }
    }
    LLUrlRegistry::instance().setKeybindingHandler(&gViewerInput);
}

void LLAppViewer::purgeCache()
{
    LL_INFOS("AppCache") << "Purging Cache and Texture Cache..." << LL_ENDL;
    LLAppViewer::getTextureCache()->purgeCache(LL_PATH_CACHE);
    LLVOCache::getInstance()->removeCache(LL_PATH_CACHE);
    LLViewerShaderMgr::instance()->clearShaderCache();
    std::string browser_cache = gDirUtilp->getExpandedFilename(LL_PATH_CACHE, "cef_cache");
    if (LLFile::isdir(browser_cache))
    {
        // cef does not support clear_cache and clear_cookies, so clear what we can manually.
        gDirUtilp->deleteDirAndContents(browser_cache);
    }
    gDirUtilp->deleteFilesInDir(gDirUtilp->getExpandedFilename(LL_PATH_CACHE, ""), "*");
}

//purge cache immediately, do not wait until the next login.
void LLAppViewer::purgeCacheImmediate()
{
    LL_INFOS("AppCache") << "Purging Object Cache and Texture Cache immediately..." << LL_ENDL;
    LLAppViewer::getTextureCache()->purgeCache(LL_PATH_CACHE, false);
    LLVOCache::getInstance()->removeCache(LL_PATH_CACHE, true);
}

std::string LLAppViewer::getSecondLifeTitle() const
{
    return LLTrans::getString("APP_NAME");
}

std::string LLAppViewer::getWindowTitle() const
{
    return gWindowTitle;
}

// Callback from a dialog indicating user was logged out.
bool finish_disconnect(const LLSD& notification, const LLSD& response)
{
    S32 option = LLNotificationsUtil::getSelectedOption(notification, response);

    if (1 == option)
    {
        LLAppViewer::instance()->forceQuit();
    }
    return false;
}

// Callback from an early disconnect dialog, force an exit
bool finish_forced_disconnect(const LLSD& notification, const LLSD& response)
{
    LLAppViewer::instance()->forceQuit();
    return false;
}


void LLAppViewer::forceDisconnect(const std::string& mesg)
{
    if (gDoDisconnect)
    {
        // Already popped up one of these dialogs, don't
        // do this again.
        return;
    }

    // *TODO: Translate the message if possible
    std::string big_reason = LLAgent::sTeleportErrorMessages[mesg];
    if ( big_reason.size() == 0 )
    {
        big_reason = mesg;
    }

    LLSD args;
    gDoDisconnect = TRUE;

    if (LLStartUp::getStartupState() < STATE_STARTED)
    {
        // Tell users what happened
        args["ERROR_MESSAGE"] = big_reason;
        LLNotificationsUtil::add("ErrorMessage", args, LLSD(), &finish_forced_disconnect);
    }
    else
    {
        args["MESSAGE"] = big_reason;
        LLNotificationsUtil::add("YouHaveBeenLoggedOut", args, LLSD(), &finish_disconnect );
    }
}

void LLAppViewer::badNetworkHandler()
{
    // Dump the packet
    gMessageSystem->dumpPacketToLog();

    // Flush all of our caches on exit in the case of disconnect due to
    // invalid packets.

    mPurgeCacheOnExit = TRUE;

    std::ostringstream message;
    message <<
        "The viewer has detected mangled network data indicative\n"
        "of a bad upstream network connection or an incomplete\n"
        "local installation of " << LLAppViewer::instance()->getSecondLifeTitle() << ". \n"
        " \n"
        "Try uninstalling and reinstalling to see if this resolves \n"
        "the issue. \n"
        " \n"
        "If the problem continues, see the Tech Support FAQ at: \n"
        "www.secondlife.com/support";
    forceDisconnect(message.str());

    LLApp::instance()->writeMiniDump();
}

// This routine may get called more than once during the shutdown process.
// This can happen because we need to get the screenshot before the window
// is destroyed.
void LLAppViewer::saveFinalSnapshot()
{
    if (!mSavedFinalSnapshot)
    {
        gSavedSettings.setVector3d("FocusPosOnLogout", gAgentCamera.calcFocusPositionTargetGlobal());
        gSavedSettings.setVector3d("CameraPosOnLogout", gAgentCamera.calcCameraPositionTargetGlobal());
        gViewerWindow->setCursor(UI_CURSOR_WAIT);
        gAgentCamera.changeCameraToThirdPerson( FALSE );    // don't animate, need immediate switch
        gSavedSettings.setBOOL("ShowParcelOwners", FALSE);
        idle();

        std::string snap_filename = gDirUtilp->getLindenUserDir();
        snap_filename += gDirUtilp->getDirDelimiter();
        snap_filename += LLStartUp::getScreenLastFilename();
        // use full pixel dimensions of viewer window (not post-scale dimensions)
        gViewerWindow->saveSnapshot(snap_filename,
                                    gViewerWindow->getWindowWidthRaw(),
                                    gViewerWindow->getWindowHeightRaw(),
                                    FALSE,
                                    gSavedSettings.getBOOL("RenderHUDInSnapshot"),
                                    TRUE,
                                    LLSnapshotModel::SNAPSHOT_TYPE_COLOR,
                                    LLSnapshotModel::SNAPSHOT_FORMAT_PNG);
        mSavedFinalSnapshot = TRUE;

        if (gAgent.isInHomeRegion())
        {
            LLVector3d home;
            if (gAgent.getHomePosGlobal(&home) && dist_vec(home, gAgent.getPositionGlobal()) < 10)
            {
                // We are at home position or close to it, see if we need to create home screenshot
                // Notes:
                // 1. It might be beneficial to also replace home if file is too old
                // 2. This is far from best way/place to update screenshot since location might be not fully loaded,
                // but we don't have many options
                std::string snap_home = gDirUtilp->getLindenUserDir();
                snap_home += gDirUtilp->getDirDelimiter();
                snap_home += LLStartUp::getScreenHomeFilename();
                if (!gDirUtilp->fileExists(snap_home))
                {
                    // We are at home position yet no home image exist, fix it
                    LLFile::copy(snap_filename, snap_home);
                }
            }
        }
    }
}

void LLAppViewer::loadNameCache()
{
    // display names cache
    std::string filename =
        gDirUtilp->getExpandedFilename(LL_PATH_CACHE, "avatar_name_cache.xml");
    LL_INFOS("AvNameCache") << filename << LL_ENDL;
    llifstream name_cache_stream(filename.c_str());
    if(name_cache_stream.is_open())
    {
        if ( ! LLAvatarNameCache::getInstance()->importFile(name_cache_stream))
        {
            LL_WARNS("AppInit") << "removing invalid '" << filename << "'" << LL_ENDL;
            name_cache_stream.close();
            LLFile::remove(filename);
        }
    }

    if (!gCacheName) return;

    std::string name_cache;
    name_cache = gDirUtilp->getExpandedFilename(LL_PATH_CACHE, "name.cache");
    llifstream cache_file(name_cache.c_str());
    if(cache_file.is_open())
    {
        if(gCacheName->importFile(cache_file)) return;
    }
}

void LLAppViewer::saveNameCache()
{
    // display names cache
    std::string filename =
        gDirUtilp->getExpandedFilename(LL_PATH_CACHE, "avatar_name_cache.xml");
    llofstream name_cache_stream(filename.c_str());
    if(name_cache_stream.is_open())
    {
        LLAvatarNameCache::getInstance()->exportFile(name_cache_stream);
    }

    // real names cache
    if (gCacheName)
    {
        std::string name_cache;
        name_cache = gDirUtilp->getExpandedFilename(LL_PATH_CACHE, "name.cache");
        llofstream cache_file(name_cache.c_str());
        if(cache_file.is_open())
        {
            gCacheName->exportFile(cache_file);
        }
    }
}


/*! @brief      This class is an LLFrameTimer that can be created with
                an elapsed time that starts counting up from the given value
                rather than 0.0.

                Otherwise it behaves the same way as LLFrameTimer.
*/
class LLFrameStatsTimer : public LLFrameTimer
{
public:
    LLFrameStatsTimer(F64 elapsed_already = 0.0)
        : LLFrameTimer()
        {
            mStartTime -= elapsed_already;
        }
};

static LLTrace::BlockTimerStatHandle FTM_AUDIO_UPDATE("Update Audio");
static LLTrace::BlockTimerStatHandle FTM_CLEANUP("Cleanup");
static LLTrace::BlockTimerStatHandle FTM_CLEANUP_DRAWABLES("Drawables");
static LLTrace::BlockTimerStatHandle FTM_IDLE_CB("Idle Callbacks");
static LLTrace::BlockTimerStatHandle FTM_LOD_UPDATE("Update LOD");
static LLTrace::BlockTimerStatHandle FTM_OBJECTLIST_UPDATE("Update Objectlist");
static LLTrace::BlockTimerStatHandle FTM_REGION_UPDATE("Update Region");
static LLTrace::BlockTimerStatHandle FTM_WORLD_UPDATE("Update World");
static LLTrace::BlockTimerStatHandle FTM_NETWORK("Network");
static LLTrace::BlockTimerStatHandle FTM_AGENT_NETWORK("Agent Network");
static LLTrace::BlockTimerStatHandle FTM_VLMANAGER("VL Manager");
static LLTrace::BlockTimerStatHandle FTM_AGENT_POSITION("Agent Position");
static LLTrace::BlockTimerStatHandle FTM_HUD_EFFECTS("HUD Effects");

///////////////////////////////////////////////////////
// idle()
//
// Called every time the window is not doing anything.
// Receive packets, update statistics, and schedule a redisplay.
///////////////////////////////////////////////////////
void LLAppViewer::idle()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_APP;
    pingMainloopTimeout("Main:Idle");

    // Update frame timers
    static LLTimer idle_timer;

    LLFrameTimer::updateFrameTime();
    LLFrameTimer::updateFrameCount();
    LLEventTimer::updateClass();
    LLPerfStats::updateClass();

    // LLApp::stepFrame() performs the above three calls plus mRunner.run().
    // Not sure why we don't call stepFrame() here, except that LLRunner seems
    // completely redundant with LLEventTimer.
    LLNotificationsUI::LLToast::updateClass();
    LLSmoothInterpolation::updateInterpolants();
    LLMortician::updateClass();
    LLFilePickerThread::clearDead();  //calls LLFilePickerThread::notify()
    LLDirPickerThread::clearDead();
    F32 dt_raw = idle_timer.getElapsedTimeAndResetF32();

    LLGLTFMaterialList::flushUpdates();

    // Service the WorkQueue we use for replies from worker threads.
    // Use function statics for the timeslice setting so we only have to fetch
    // and convert MainWorkTime once.
    static F32 MainWorkTimeRaw = gSavedSettings.getF32("MainWorkTime");
    static F32Milliseconds MainWorkTimeMs(MainWorkTimeRaw);
    // MainWorkTime is specified in fractional milliseconds, but std::chrono
    // uses integer representations. What if we want less than a microsecond?
    // Use nanoseconds. We're very sure we will never need to specify a
    // MainWorkTime that would be larger than we could express in
    // std::chrono::nanoseconds.
    static std::chrono::nanoseconds MainWorkTimeNanoSec{
        std::chrono::nanoseconds::rep(MainWorkTimeMs.value() * 1000000)};
    gMainloopWork.runFor(MainWorkTimeNanoSec);

    // Cap out-of-control frame times
    // Too low because in menus, swapping, debugger, etc.
    // Too high because idle called with no objects in view, etc.
    const F32 MIN_FRAME_RATE = 1.f;
    const F32 MAX_FRAME_RATE = 200.f;

    F32 frame_rate_clamped = 1.f / dt_raw;
    frame_rate_clamped = llclamp(frame_rate_clamped, MIN_FRAME_RATE, MAX_FRAME_RATE);
    gFrameDTClamped = 1.f / frame_rate_clamped;

    // Global frame timer
    // Smoothly weight toward current frame
    gFPSClamped = (frame_rate_clamped + (4.f * gFPSClamped)) / 5.f;

    F32 qas = gSavedSettings.getF32("QuitAfterSeconds");
    if (qas > 0.f)
    {
        if (gRenderStartTime.getElapsedTimeF32() > qas)
        {
            LL_INFOS() << "Quitting after " << qas << " seconds. See setting \"QuitAfterSeconds\"." << LL_ENDL;
            LLAppViewer::instance()->forceQuit();
        }
    }

    // Must wait until both have avatar object and mute list, so poll
    // here.
    LLIMProcessing::requestOfflineMessages();

    ///////////////////////////////////
    //
    // Special case idle if still starting up
    //
    if (LLStartUp::getStartupState() < STATE_STARTED)
    {
        // Skip rest if idle startup returns false (essentially, no world yet)
        gGLActive = TRUE;
        if (!idle_startup())
        {
            gGLActive = FALSE;
            return;
        }
        gGLActive = FALSE;
    }


    F32 yaw = 0.f;              // radians

    if (!gDisconnected)
    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_NETWORK("network"); //LL_RECORD_BLOCK_TIME(FTM_NETWORK);
        // Update spaceserver timeinfo
        LLWorld::getInstance()->setSpaceTimeUSec(LLWorld::getInstance()->getSpaceTimeUSec() + LLUnits::Seconds::fromValue(dt_raw));


        //////////////////////////////////////
        //
        // Update simulator agent state
        //

        if (gSavedSettings.getBOOL("RotateRight"))
        {
            gAgent.moveYaw(-1.f);
        }

        {
            LL_PROFILE_ZONE_NAMED_CATEGORY_APP("Autopilot");
            // Handle automatic walking towards points
            gAgentPilot.updateTarget();
            gAgent.autoPilot(&yaw);
        }

        static LLFrameTimer agent_update_timer;

        // When appropriate, update agent location to the simulator.
        F32 agent_update_time = agent_update_timer.getElapsedTimeF32();
        F32 agent_force_update_time = mLastAgentForceUpdate + agent_update_time;
        bool timed_out = agent_update_time > (1.0f / (F32)AGENT_UPDATES_PER_SECOND);
        BOOL force_send =
            // if there is something to send
            (gAgent.controlFlagsDirty() && timed_out)
            // if something changed
            || (mLastAgentControlFlags != gAgent.getControlFlags())
            // keep alive
            || (agent_force_update_time > (1.0f / (F32) AGENT_FORCE_UPDATES_PER_SECOND));
        // timing out doesn't warranty that an update will be sent,
        // just that it will be checked.
        if (force_send || timed_out)
        {
            LL_PROFILE_ZONE_SCOPED_CATEGORY_NETWORK;
            // Send avatar and camera info
            mLastAgentControlFlags = gAgent.getControlFlags();
            mLastAgentForceUpdate = force_send ? 0 : agent_force_update_time;
            send_agent_update(force_send);
            agent_update_timer.reset();
        }
    }

    //////////////////////////////////////
    //
    // Manage statistics
    //
    //
    {
        // Initialize the viewer_stats_timer with an already elapsed time
        // of SEND_STATS_PERIOD so that the initial stats report will
        // be sent immediately.
        static LLFrameStatsTimer viewer_stats_timer(SEND_STATS_PERIOD);

        // Update session stats every large chunk of time
        // *FIX: (?) SAMANTHA
        if (viewer_stats_timer.getElapsedTimeF32() >= SEND_STATS_PERIOD && !gDisconnected)
        {
            LL_INFOS() << "Transmitting sessions stats" << LL_ENDL;
            bool include_preferences = false;
            send_viewer_stats(include_preferences);
            viewer_stats_timer.reset();
        }

        // Print the object debugging stats
        static LLFrameTimer object_debug_timer;
        if (object_debug_timer.getElapsedTimeF32() > 5.f)
        {
            object_debug_timer.reset();
            if (gObjectList.mNumDeadObjectUpdates)
            {
                LL_INFOS() << "Dead object updates: " << gObjectList.mNumDeadObjectUpdates << LL_ENDL;
                gObjectList.mNumDeadObjectUpdates = 0;
            }
            if (gObjectList.mNumUnknownUpdates)
            {
                LL_INFOS() << "Unknown object updates: " << gObjectList.mNumUnknownUpdates << LL_ENDL;
                gObjectList.mNumUnknownUpdates = 0;
            }

        }
    }

    if (!gDisconnected)
    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_DISPLAY("Network");

        ////////////////////////////////////////////////
        //
        // Network processing
        //
        // NOTE: Starting at this point, we may still have pointers to "dead" objects
        // floating throughout the various object lists.
        //
        idleNameCache();
        idleNetwork();


        // Check for away from keyboard, kick idle agents.
        idle_afk_check();

        //  Update statistics for this frame
        update_statistics();
    }

    ////////////////////////////////////////
    //
    // Handle the regular UI idle callbacks as well as
    // hover callbacks
    //

#ifdef LL_DARWIN
    if (!mQuitRequested)  //MAINT-4243
#endif
    {
//      LL_RECORD_BLOCK_TIME(FTM_IDLE_CB);

        // Do event notifications if necessary.  Yes, we may want to move this elsewhere.
        gEventNotifier.update();

        gIdleCallbacks.callFunctions();
        gInventory.idleNotifyObservers();
        LLAvatarTracker::instance().idleNotifyObservers();
    }

    // Metrics logging (LLViewerAssetStats, etc.)
    {
        static LLTimer report_interval;

        // *TODO:  Add configuration controls for this
        F32 seconds = report_interval.getElapsedTimeF32();
        if (seconds >= app_metrics_interval)
        {
            metricsSend(! gDisconnected);
            report_interval.reset();
        }
    }


    // Update layonts, handle mouse events, tooltips, e t c
    // updateUI() needs to be called even in case viewer disconected
    // since related notification still needs handling and allows
    // opening chat.
    gViewerWindow->updateUI();

    if (gDisconnected)
    {
        return;
    }

    if (gTeleportDisplay)
    {
        return;
    }

    ///////////////////////////////////////
    // Agent and camera movement
    //
    LLCoordGL current_mouse = gViewerWindow->getCurrentMouse();

    {
        // After agent and camera moved, figure out if we need to
        // deselect objects.
        LLSelectMgr::getInstance()->deselectAllIfTooFar();

    }

    {
        // Handle pending gesture processing
        LL_RECORD_BLOCK_TIME(FTM_AGENT_POSITION);
        LLGestureMgr::instance().update();

        gAgent.updateAgentPosition(gFrameDTClamped, yaw, current_mouse.mX, current_mouse.mY);
    }

    {
        LL_RECORD_BLOCK_TIME(FTM_OBJECTLIST_UPDATE);

        if (!(logoutRequestSent() && hasSavedFinalSnapshot()))
        {
            gObjectList.update(gAgent);
            LL::GLTFSceneManager::instance().update();
        }
    }

    //////////////////////////////////////
    //
    // Deletes objects...
    // Has to be done after doing idleUpdates (which can kill objects)
    //

    {
        LL_RECORD_BLOCK_TIME(FTM_CLEANUP);
        {
            gObjectList.cleanDeadObjects();
        }
        {
            LL_RECORD_BLOCK_TIME(FTM_CLEANUP_DRAWABLES);
            LLDrawable::cleanupDeadDrawables();
        }
    }

    //
    // After this point, in theory we should never see a dead object
    // in the various object/drawable lists.
    //

    //////////////////////////////////////
    //
    // Update/send HUD effects
    //
    // At this point, HUD effects may clean up some references to
    // dead objects.
    //

    {
        LL_RECORD_BLOCK_TIME(FTM_HUD_EFFECTS);
        LLSelectMgr::getInstance()->updateEffects();
        LLHUDManager::getInstance()->cleanupEffects();
        LLHUDManager::getInstance()->sendEffects();
    }

    ////////////////////////////////////////
    //
    // Unpack layer data that we've received
    //

    {
        LL_RECORD_BLOCK_TIME(FTM_NETWORK);
        gVLManager.unpackData();
    }

    /////////////////////////
    //
    // Update surfaces, and surface textures as well.
    //

    LLWorld::getInstance()->updateVisibilities();
    {
        const F32 max_region_update_time = .001f; // 1ms
        LL_RECORD_BLOCK_TIME(FTM_REGION_UPDATE);
        LLWorld::getInstance()->updateRegions(max_region_update_time);
    }

    /////////////////////////
    //
    // Update weather effects
    //

    // Update wind vector
    LLVector3 wind_position_region;
    static LLVector3 average_wind;

    LLViewerRegion *regionp;
    regionp = LLWorld::getInstance()->resolveRegionGlobal(wind_position_region, gAgent.getPositionGlobal());    // puts agent's local coords into wind_position
    if (regionp)
    {
        gWindVec = regionp->mWind.getVelocity(wind_position_region);

        // Compute average wind and use to drive motion of water

        average_wind = regionp->mWind.getAverage();
        gSky.setWind(average_wind);
        //LLVOWater::setWind(average_wind);
    }
    else
    {
        gWindVec.setVec(0.0f, 0.0f, 0.0f);
    }

    //////////////////////////////////////
    //
    // Sort and cull in the new renderer are moved to pipeline.cpp
    // Here, particles are updated and drawables are moved.
    //

    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_APP("world update"); //LL_RECORD_BLOCK_TIME(FTM_WORLD_UPDATE);
        gPipeline.updateMove();
    }

    LLWorld::getInstance()->updateParticles();

    if (gAgentPilot.isPlaying() && gAgentPilot.getOverrideCamera())
    {
        gAgentPilot.moveCamera();
    }
    else if (LLViewerJoystick::getInstance()->getOverrideCamera())
    {
        LLViewerJoystick::getInstance()->moveFlycam();
    }
    else
    {
        if (LLToolMgr::getInstance()->inBuildMode())
        {
            LLViewerJoystick::getInstance()->moveObjects();
        }

        gAgentCamera.updateCamera();
    }

    // update media focus
    LLViewerMediaFocus::getInstance()->update();

    // Update marketplace
    LLMarketplaceInventoryImporter::update();
    LLMarketplaceInventoryNotifications::update();

    // objects and camera should be in sync, do LOD calculations now
    {
        LL_RECORD_BLOCK_TIME(FTM_LOD_UPDATE);
        gObjectList.updateApparentAngles(gAgent);
    }

    // Update AV render info
    LLAvatarRenderInfoAccountant::getInstance()->idle();

    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_APP("audio update"); //LL_RECORD_BLOCK_TIME(FTM_AUDIO_UPDATE);

        if (gAudiop)
        {
            audio_update_volume(false);
            audio_update_listener();
            audio_update_wind(false);

            // this line actually commits the changes we've made to source positions, etc.
            gAudiop->idle();
        }
    }

    // Handle shutdown process, for example,
    // wait for floaters to close, send quit message,
    // forcibly quit if it has taken too long
    if (mQuitRequested)
    {
        gGLActive = TRUE;
        idleShutdown();
    }
}

void LLAppViewer::idleShutdown()
{
    // Wait for all modal alerts to get resolved
    if (LLModalDialog::activeCount() > 0)
    {
        return;
    }

    // close IM interface
    if(gIMMgr)
    {
        gIMMgr->disconnectAllSessions();
    }

    // Wait for all floaters to get resolved
    if (gFloaterView
        && !gFloaterView->allChildrenClosed())
    {
        return;
    }




    // ProductEngine: Try moving this code to where we shut down sTextureCache in cleanup()
    // *TODO: ugly
    static bool saved_teleport_history = false;
    if (!saved_teleport_history)
    {
        saved_teleport_history = true;
        LLTeleportHistory::getInstance()->dump();
        LLLocationHistory::getInstance()->save(); // *TODO: find a better place for doing this
        return;
    }

    static bool saved_snapshot = false;
    if (!saved_snapshot)
    {
        saved_snapshot = true;
        saveFinalSnapshot();
        return;
    }

    const F32 SHUTDOWN_UPLOAD_SAVE_TIME = 5.f;

    S32 pending_uploads = gAssetStorage->getNumPendingUploads();
    if (pending_uploads > 0
        && gLogoutTimer.getElapsedTimeF32() < SHUTDOWN_UPLOAD_SAVE_TIME
        && !logoutRequestSent())
    {
        static S32 total_uploads = 0;
        // Sometimes total upload count can change during logout.
        total_uploads = llmax(total_uploads, pending_uploads);
        gViewerWindow->setShowProgress(TRUE);
        S32 finished_uploads = total_uploads - pending_uploads;
        F32 percent = 100.f * finished_uploads / total_uploads;
        gViewerWindow->setProgressPercent(percent);
        gViewerWindow->setProgressString(LLTrans::getString("SavingSettings"));
        return;
    }

    if (gPendingMetricsUploads > 0
        && gLogoutTimer.getElapsedTimeF32() < SHUTDOWN_UPLOAD_SAVE_TIME
        && !logoutRequestSent())
    {
        gViewerWindow->setShowProgress(TRUE);
        gViewerWindow->setProgressPercent(100.f);
        gViewerWindow->setProgressString(LLTrans::getString("LoggingOut"));
        return;
    }

    // All floaters are closed.  Tell server we want to quit.
    if( !logoutRequestSent() )
    {
        sendLogoutRequest();

        // Wait for a LogoutReply message
        gViewerWindow->setShowProgress(TRUE);
        gViewerWindow->setProgressPercent(100.f);
        gViewerWindow->setProgressString(LLTrans::getString("LoggingOut"));
        return;
    }

    // Make sure that we quit if we haven't received a reply from the server.
    if( logoutRequestSent()
        && gLogoutTimer.getElapsedTimeF32() > gLogoutMaxTime )
    {
        forceQuit();
        return;
    }
}

void LLAppViewer::sendLogoutRequest()
{
    if(!mLogoutRequestSent && gMessageSystem)
    {
        //Set internal status variables and marker files before actually starting the logout process
        gLogoutInProgress = TRUE;
        if (!mSecondInstance)
        {
            mLogoutMarkerFileName = gDirUtilp->getExpandedFilename(LL_PATH_LOGS,LOGOUT_MARKER_FILE_NAME);

            mLogoutMarkerFile.open(mLogoutMarkerFileName, LL_APR_WB);
            if (mLogoutMarkerFile.getFileHandle())
            {
                LL_INFOS("MarkerFile") << "Created logout marker file '"<< mLogoutMarkerFileName << "' " << LL_ENDL;
                recordMarkerVersion(mLogoutMarkerFile);
            }
            else
            {
                LL_WARNS("MarkerFile") << "Cannot create logout marker file " << mLogoutMarkerFileName << LL_ENDL;
            }
        }
        else
        {
            LL_INFOS("MarkerFile") << "Did not logout marker file because this is a second instance" << LL_ENDL;
        }

        LLMessageSystem* msg = gMessageSystem;
        msg->newMessageFast(_PREHASH_LogoutRequest);
        msg->nextBlockFast(_PREHASH_AgentData);
        msg->addUUIDFast(_PREHASH_AgentID, gAgent.getID() );
        msg->addUUIDFast(_PREHASH_SessionID, gAgent.getSessionID());
        gAgent.sendReliableMessage();

        gLogoutTimer.reset();
        gLogoutMaxTime = LOGOUT_REQUEST_TIME;
        mLogoutRequestSent = TRUE;

        if(LLVoiceClient::instanceExists())
        {
            LLVoiceClient::getInstance()->setVoiceEnabled(false);
        }
    }
}

void LLAppViewer::updateNameLookupUrl(const LLViewerRegion * regionp)
{
    if (!regionp || !regionp->capabilitiesReceived())
    {
        return;
    }

    LLAvatarNameCache *name_cache = LLAvatarNameCache::getInstance();
    bool had_capability = LLAvatarNameCache::getInstance()->hasNameLookupURL();
    std::string name_lookup_url;
    name_lookup_url.reserve(128); // avoid a memory allocation below
    name_lookup_url = regionp->getCapability("GetDisplayNames");
    bool have_capability = !name_lookup_url.empty();
    if (have_capability)
    {
        // we have support for display names, use it
        U32 url_size = name_lookup_url.size();
        // capabilities require URLs with slashes before query params:
        // https://<host>:<port>/cap/<uuid>/?ids=<blah>
        // but the caps are granted like:
        // https://<host>:<port>/cap/<uuid>
        if (url_size > 0 && name_lookup_url[url_size - 1] != '/')
        {
            name_lookup_url += '/';
        }
        name_cache->setNameLookupURL(name_lookup_url);
    }
    else
    {
        // Display names not available on this region
        name_cache->setNameLookupURL(std::string());
    }

    // Error recovery - did we change state?
    if (had_capability != have_capability)
    {
        // name tags are persistant on screen, so make sure they refresh
        LLVOAvatar::invalidateNameTags();
    }
}

void LLAppViewer::idleNameCache()
{
    // Neither old nor new name cache can function before agent has a region
    LLViewerRegion* region = gAgent.getRegion();
    if (!region)
    {
        return;
    }

    // deal with any queued name requests and replies.
    gCacheName->processPending();

    // Can't run the new cache until we have the list of capabilities
    // for the agent region, and can therefore decide whether to use
    // display names or fall back to the old name system.
    if (!region->capabilitiesReceived())
    {
        return;
    }

    LLAvatarNameCache::getInstance()->idle();
}

//
// Handle messages, and all message related stuff
//

#define TIME_THROTTLE_MESSAGES

#ifdef TIME_THROTTLE_MESSAGES
#define CHECK_MESSAGES_DEFAULT_MAX_TIME .020f // 50 ms = 50 fps (just for messages!)
static F32 CheckMessagesMaxTime = CHECK_MESSAGES_DEFAULT_MAX_TIME;
#endif

static LLTrace::BlockTimerStatHandle FTM_IDLE_NETWORK("Idle Network");
static LLTrace::BlockTimerStatHandle FTM_MESSAGE_ACKS("Message Acks");
static LLTrace::BlockTimerStatHandle FTM_RETRANSMIT("Retransmit");
static LLTrace::BlockTimerStatHandle FTM_TIMEOUT_CHECK("Timeout Check");
static LLTrace::BlockTimerStatHandle FTM_DYNAMIC_THROTTLE("Dynamic Throttle");
static LLTrace::BlockTimerStatHandle FTM_CHECK_REGION_CIRCUIT("Check Region Circuit");

void LLAppViewer::idleNetwork()
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_NETWORK;
    pingMainloopTimeout("idleNetwork");

    gObjectList.mNumNewObjects = 0;
    S32 total_decoded = 0;

    if (!gSavedSettings.getBOOL("SpeedTest"))
    {
        LL_PROFILE_ZONE_NAMED_CATEGORY_NETWORK("idle network"); //LL_RECORD_BLOCK_TIME(FTM_IDLE_NETWORK); // decode

        LLTimer check_message_timer;
        //  Read all available packets from network
        const S64 frame_count = gFrameCount;  // U32->S64
        F32 total_time = 0.0f;

        {
            LockMessageChecker lmc(gMessageSystem);
            while (lmc.checkAllMessages(frame_count, gServicePump))
            {
                if (gDoDisconnect)
                {
                    // We're disconnecting, don't process any more messages from the server
                    // We're usually disconnecting due to either network corruption or a
                    // server going down, so this is OK.
                    break;
                }

                total_decoded++;
                gPacketsIn++;

                if (total_decoded > MESSAGE_MAX_PER_FRAME)
                {
                    break;
                }

#ifdef TIME_THROTTLE_MESSAGES
                // Prevent slow packets from completely destroying the frame rate.
                // This usually happens due to clumps of avatars taking huge amount
                // of network processing time (which needs to be fixed, but this is
                // a good limit anyway).
                total_time = check_message_timer.getElapsedTimeF32();
                if (total_time >= CheckMessagesMaxTime)
                    break;
#endif
            }

            // Handle per-frame message system processing.
            lmc.processAcks(gSavedSettings.getF32("AckCollectTime"));
        }

#ifdef TIME_THROTTLE_MESSAGES
        if (total_time >= CheckMessagesMaxTime)
        {
            // Increase CheckMessagesMaxTime so that we will eventually catch up
            CheckMessagesMaxTime *= 1.035f; // 3.5% ~= x2 in 20 frames, ~8x in 60 frames
        }
        else
        {
            // Reset CheckMessagesMaxTime to default value
            CheckMessagesMaxTime = CHECK_MESSAGES_DEFAULT_MAX_TIME;
        }
#endif



        // we want to clear the control after sending out all necessary agent updates
        gAgent.resetControlFlags();

        // Decode enqueued messages...
        S32 remaining_possible_decodes = MESSAGE_MAX_PER_FRAME - total_decoded;

        if( remaining_possible_decodes <= 0 )
        {
            LL_INFOS() << "Maxed out number of messages per frame at " << MESSAGE_MAX_PER_FRAME << LL_ENDL;
        }

        if (gPrintMessagesThisFrame)
        {
            LL_INFOS() << "Decoded " << total_decoded << " msgs this frame!" << LL_ENDL;
            gPrintMessagesThisFrame = FALSE;
        }
    }
    add(LLStatViewer::NUM_NEW_OBJECTS, gObjectList.mNumNewObjects);

    // Retransmit unacknowledged packets.
    gXferManager->retransmitUnackedPackets();
    gAssetStorage->checkForTimeouts();
    gViewerThrottle.updateDynamicThrottle();

    // Check that the circuit between the viewer and the agent's current
    // region is still alive
    LLViewerRegion *agent_region = gAgent.getRegion();
    if (agent_region && (LLStartUp::getStartupState()==STATE_STARTED))
    {
        LLUUID this_region_id = agent_region->getRegionID();
        bool this_region_alive = agent_region->isAlive();
        if ((mAgentRegionLastAlive && !this_region_alive) // newly dead
            && (mAgentRegionLastID == this_region_id)) // same region
        {
            forceDisconnect(LLTrans::getString("AgentLostConnection"));
        }
        mAgentRegionLastID = this_region_id;
        mAgentRegionLastAlive = this_region_alive;
    }
}

void LLAppViewer::disconnectViewer()
{
    if (gDisconnected)
    {
        return;
    }
    //
    // Cleanup after quitting.
    //
    // Save snapshot for next time, if we made it through initialization

    LL_INFOS() << "Disconnecting viewer!" << LL_ENDL;

    // Dump our frame statistics

    // Remember if we were flying
    gSavedSettings.setBOOL("FlyingAtExit", gAgent.getFlying() );

    // Un-minimize all windows so they don't get saved minimized
    if (gFloaterView)
    {
        gFloaterView->restoreAll();
    }

    if (LLSelectMgr::instanceExists())
    {
        LLSelectMgr::getInstance()->deselectAll();
    }

    // save inventory if appropriate
    if (gInventory.isInventoryUsable()
        && gAgent.getID().notNull()) // Shouldn't be null at this stage
    {
        gInventory.cache(gInventory.getRootFolderID(), gAgent.getID());
        if (gInventory.getLibraryRootFolderID().notNull()
            && gInventory.getLibraryOwnerID().notNull()
            && !mSecondInstance) // agent is unique, library isn't
        {
            gInventory.cache(
                gInventory.getLibraryRootFolderID(),
                gInventory.getLibraryOwnerID());
        }
    }

    saveNameCache();
    if (LLExperienceCache::instanceExists())
    {
        // TODO: LLExperienceCache::cleanup() logic should be moved to
        // cleanupSingleton().
        LLExperienceCache::instance().cleanup();
    }

    // close inventory interface, close all windows
    LLSidepanelInventory::cleanup();

    gAgentWearables.cleanup();
    gAgentCamera.cleanup();
    // Also writes cached agent settings to gSavedSettings
    gAgent.cleanup();

    // This is where we used to call gObjectList.destroy() and then delete gWorldp.
    // Now we just ask the LLWorld singleton to cleanly shut down.
    if(LLWorld::instanceExists())
    {
        LLWorld::getInstance()->resetClass();
    }
    LLVOCache::deleteSingleton();

    // call all self-registered classes
    LLDestroyClassList::instance().fireCallbacks();

    cleanup_xfer_manager();
    gDisconnected = TRUE;

    // Pass the connection state to LLUrlEntryParcel not to attempt
    // parcel info requests while disconnected.
    LLUrlEntryParcel::setDisconnected(gDisconnected);
}

void LLAppViewer::forceErrorLLError()
{
    LL_ERRS() << "This is a deliberate llerror" << LL_ENDL;
}

void LLAppViewer::forceErrorLLErrorMsg()
{
    LLError::LLUserWarningMsg::show("Deliberate error");
    // Note: under debug this will show a message as well,
    // but release won't show anything and will quit silently
    LL_ERRS() << "This is a deliberate llerror with a message" << LL_ENDL;
}

void LLAppViewer::forceErrorBreakpoint()
{
    LL_WARNS() << "Forcing a deliberate breakpoint" << LL_ENDL;
#ifdef LL_WINDOWS
    DebugBreak();
#elif __i386__ || __x86_64__
    asm ("int $3");
#endif
    return;
}

void LLAppViewer::forceErrorBadMemoryAccess()
{
    LL_WARNS() << "Forcing a deliberate bad memory access" << LL_ENDL;
    S32* crash = NULL;
    *crash = 0xDEADBEEF;
    return;
}

void LLAppViewer::forceErrorInfiniteLoop()
{
    LL_WARNS() << "Forcing a deliberate infinite loop" << LL_ENDL;
    // Loop is intentionally complicated to fool basic loop detection
    LLTimer timer_total;
    LLTimer timer_expiry;
    const S32 report_frequency = 10;
    timer_expiry.setTimerExpirySec(report_frequency);
    while(true)
    {
        if (timer_expiry.hasExpired())
        {
            LL_INFOS() << "Infinite loop time : " << timer_total.getElapsedSeconds() << LL_ENDL;
            timer_expiry.setTimerExpirySec(report_frequency);
        }
    }
    return;
}

void LLAppViewer::forceErrorSoftwareException()
{
    LL_WARNS() << "Forcing a deliberate exception" << LL_ENDL;
    LLTHROW(LLException("User selected Force Software Exception"));
}

void LLAppViewer::forceErrorOSSpecificException()
{
    // Virtual, MacOS only
    const std::string exception_text = "User selected Force OS Exception, Not implemented on this OS";
    throw std::runtime_error(exception_text);
}

void LLAppViewer::forceErrorDriverCrash()
{
    LL_WARNS() << "Forcing a deliberate driver crash" << LL_ENDL;
    glDeleteTextures(1, NULL);
}

void LLAppViewer::forceErrorCoroutineCrash()
{
    LL_WARNS() << "Forcing a crash in LLCoros" << LL_ENDL;
    LLCoros::instance().launch("LLAppViewer::crashyCoro", [] {throw LLException("A deliberate crash from LLCoros"); });
}

void LLAppViewer::forceErrorThreadCrash()
{
    class LLCrashTestThread : public LLThread
    {
    public:

        LLCrashTestThread() : LLThread("Crash logging test thread")
        {
        }

        void run()
        {
            LL_ERRS() << "This is a deliberate llerror in thread" << LL_ENDL;
        }
    };

    LL_WARNS() << "This is a deliberate crash in a thread" << LL_ENDL;
    LLCrashTestThread *thread = new LLCrashTestThread();
    thread->start();
}

void LLAppViewer::initMainloopTimeout(const std::string& state, F32 secs)
{
    if(!mMainloopTimeout)
    {
        mMainloopTimeout = new LLWatchdogTimeout();
        resumeMainloopTimeout(state, secs);
    }
}

void LLAppViewer::destroyMainloopTimeout()
{
    if(mMainloopTimeout)
    {
        delete mMainloopTimeout;
        mMainloopTimeout = NULL;
    }
}

void LLAppViewer::resumeMainloopTimeout(const std::string& state, F32 secs)
{
    if(mMainloopTimeout)
    {
        if(secs < 0.0f)
        {
            static LLCachedControl<F32> mainloop_timeout(gSavedSettings, "MainloopTimeoutDefault", 60);
            secs = mainloop_timeout;
        }

        mMainloopTimeout->setTimeout(secs);
        mMainloopTimeout->start(state);
    }
}

void LLAppViewer::pauseMainloopTimeout()
{
    if(mMainloopTimeout)
    {
        mMainloopTimeout->stop();
    }
}

void LLAppViewer::pingMainloopTimeout(const std::string& state, F32 secs)
{
    LL_PROFILE_ZONE_SCOPED_CATEGORY_APP;

    if(mMainloopTimeout)
    {
        if(secs < 0.0f)
        {
            static LLCachedControl<F32> mainloop_timeout(gSavedSettings, "MainloopTimeoutDefault", 60);
            secs = mainloop_timeout;
        }

        mMainloopTimeout->setTimeout(secs);
        mMainloopTimeout->ping(state);
    }
}

void LLAppViewer::handleLoginComplete()
{
    gLoggedInTime.start();
    initMainloopTimeout("Mainloop Init");

    // Store some data to DebugInfo in case of a freeze.
    gDebugInfo["ClientInfo"]["Name"] = LLVersionInfo::instance().getChannel();

    gDebugInfo["ClientInfo"]["MajorVersion"] = LLVersionInfo::instance().getMajor();
    gDebugInfo["ClientInfo"]["MinorVersion"] = LLVersionInfo::instance().getMinor();
    gDebugInfo["ClientInfo"]["PatchVersion"] = LLVersionInfo::instance().getPatch();
    gDebugInfo["ClientInfo"]["BuildVersion"] = std::to_string(LLVersionInfo::instance().getBuild());

    LLParcel* parcel = LLViewerParcelMgr::getInstance()->getAgentParcel();
    if ( parcel && parcel->getMusicURL()[0])
    {
        gDebugInfo["ParcelMusicURL"] = parcel->getMusicURL();
    }
    if ( parcel && parcel->getMediaURL()[0])
    {
        gDebugInfo["ParcelMediaURL"] = parcel->getMediaURL();
    }

    gDebugInfo["SettingsFilename"] = gSavedSettings.getString("ClientSettingsFile");
    gDebugInfo["CAFilename"] = gDirUtilp->getCAFile();
    gDebugInfo["ViewerExePath"] = gDirUtilp->getExecutablePathAndName();
    gDebugInfo["CurrentPath"] = gDirUtilp->getCurPath();

    if(gAgent.getRegion())
    {
        gDebugInfo["CurrentSimHost"] = gAgent.getRegion()->getSimHostName();
        gDebugInfo["CurrentRegion"] = gAgent.getRegion()->getName();
    }

    if(LLAppViewer::instance()->mMainloopTimeout)
    {
        gDebugInfo["MainloopTimeoutState"] = LLAppViewer::instance()->mMainloopTimeout->getState();
    }

    mOnLoginCompleted();

    writeDebugInfo();

    // we logged in successfully, so save settings on logout
    LL_INFOS() << "Login successful, per account settings will be saved on log out." << LL_ENDL;
    mSavePerAccountSettings=true;
}

//virtual
void LLAppViewer::setMasterSystemAudioMute(bool mute)
{
    gSavedSettings.setBOOL("MuteAudio", mute);
}

//virtual
bool LLAppViewer::getMasterSystemAudioMute()
{
    return gSavedSettings.getBOOL("MuteAudio");
}

//----------------------------------------------------------------------------
// Metrics-related methods (static and otherwise)
//----------------------------------------------------------------------------

/**
 * LLViewerAssetStats collects data on a per-region (as defined by the agent's
 * location) so we need to tell it about region changes which become a kind of
 * hidden variable/global state in the collectors.  For collectors not running
 * on the main thread, we need to send a message to move the data over safely
 * and cheaply (amortized over a run).
 */
void LLAppViewer::metricsUpdateRegion(U64 region_handle)
{
    if (0 != region_handle)
    {
        LLViewerAssetStatsFF::set_region(region_handle);
    }
}

/**
 * Attempts to start a multi-threaded metrics report to be sent back to
 * the grid for consumption.
 */
void LLAppViewer::metricsSend(bool enable_reporting)
{
    if (! gViewerAssetStats)
        return;

    if (LLAppViewer::sTextureFetch)
    {
        LLViewerRegion * regionp = gAgent.getRegion();

        if (enable_reporting && regionp)
        {
            std::string caps_url = regionp->getCapability("ViewerMetrics");

            LLSD sd = gViewerAssetStats->asLLSD(true);

            // Send a report request into 'thread1' to get the rest of the data
            // and provide some additional parameters while here.
            LLAppViewer::sTextureFetch->commandSendMetrics(caps_url,
                                                           gAgentSessionID,
                                                           gAgentID,
                                                           sd);
        }
        else
        {
            LLAppViewer::sTextureFetch->commandDataBreak();
        }
    }

    // Reset even if we can't report.  Rather than gather up a huge chunk of
    // data, we'll keep to our sampling interval and retain the data
    // resolution in time.
    gViewerAssetStats->restart();
}