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/**
* @file llerrorthread.cpp
*
* $LicenseInfo:firstyear=2004&license=viewerlgpl$
* Second Life Viewer Source Code
* Copyright (C) 2010, 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 "linden_common.h"
#include "llerrorthread.h"
#include "llapp.h"
#include "lltimer.h" // ms_sleep()
LLErrorThread::LLErrorThread()
: LLThread("Error"),
mUserDatap(NULL)
{
}
LLErrorThread::~LLErrorThread()
{
}
void LLErrorThread::setUserData(void* user_data)
{
mUserDatap = user_data;
}
void* LLErrorThread::getUserData() const
{
return mUserDatap;
}
#if !LL_WINDOWS
//
// Various signal/error handling functions that can't be put into the class
//
void get_child_status(const int waitpid_status, int &process_status, bool &exited, bool do_logging)
{
exited = false;
process_status = -1;
// The child process exited. Call its callback, and then clean it up
if (WIFEXITED(waitpid_status))
{
process_status = WEXITSTATUS(waitpid_status);
exited = true;
if (do_logging)
{
llinfos << "get_child_status - Child exited cleanly with return of " << process_status << llendl;
}
return;
}
else if (WIFSIGNALED(waitpid_status))
{
process_status = WTERMSIG(waitpid_status);
exited = true;
if (do_logging)
{
llinfos << "get_child_status - Child died because of uncaught signal " << process_status << llendl;
#ifdef WCOREDUMP
if (WCOREDUMP(waitpid_status))
{
llinfos << "get_child_status - Child dumped core" << llendl;
}
else
{
llinfos << "get_child_status - Child didn't dump core" << llendl;
}
#endif
}
return;
}
else if (do_logging)
{
// This is weird. I just dump the waitpid status into the status code,
// not that there's any way of telling what it is...
llinfos << "get_child_status - Got SIGCHILD but child didn't exit" << llendl;
process_status = waitpid_status;
}
}
#endif
void LLErrorThread::run()
{
LLApp::sErrorThreadRunning = TRUE;
// This thread sits and waits for the sole purpose
// of waiting for the signal/exception handlers to flag the
// application state as APP_STATUS_ERROR.
llinfos << "thread_error - Waiting for an error" << llendl;
S32 counter = 0;
#if !LL_WINDOWS
U32 last_sig_child_count = 0;
#endif
while (! (LLApp::isError() || LLApp::isStopped()))
{
#if !LL_WINDOWS
// Check whether or not the main thread had a sig child we haven't handled.
U32 current_sig_child_count = LLApp::getSigChildCount();
if (last_sig_child_count != current_sig_child_count)
{
int status = 0;
pid_t child_pid = 0;
last_sig_child_count = current_sig_child_count;
if (LLApp::sLogInSignal)
{
llinfos << "thread_error handling SIGCHLD #" << current_sig_child_count << llendl;
}
for (LLApp::child_map::iterator iter = LLApp::sChildMap.begin(); iter != LLApp::sChildMap.end();)
{
child_pid = iter->first;
LLChildInfo &child_info = iter->second;
// check the status of *all* children, in case we missed a signal
if (0 != waitpid(child_pid, &status, WNOHANG))
{
bool exited = false;
int exit_status = -1;
get_child_status(status, exit_status, exited, LLApp::sLogInSignal);
if (child_info.mCallback)
{
if (LLApp::sLogInSignal)
{
llinfos << "Signal handler - Running child callback" << llendl;
}
child_info.mCallback(child_pid, exited, status);
}
LLApp::sChildMap.erase(iter++);
}
else
{
// Child didn't terminate, yet we got a sigchild somewhere...
if (child_info.mGotSigChild && child_info.mCallback)
{
child_info.mCallback(child_pid, false, 0);
}
child_info.mGotSigChild = FALSE;
iter++;
}
}
// check the status of *all* children, in case we missed a signal
// Same as above, but use the default child callback
while(0 < (child_pid = waitpid( -1, &status, WNOHANG )))
{
if (0 != waitpid(child_pid, &status, WNOHANG))
{
bool exited = false;
int exit_status = -1;
get_child_status(status, exit_status, exited, LLApp::sLogInSignal);
if (LLApp::sDefaultChildCallback)
{
if (LLApp::sLogInSignal)
{
llinfos << "Signal handler - Running default child callback" << llendl;
}
LLApp::sDefaultChildCallback(child_pid, true, status);
}
}
}
}
#endif
ms_sleep(10);
counter++;
}
if (LLApp::isError())
{
// The app is in an error state, run the application's error handler.
//llinfos << "thread_error - An error has occurred, running error callback!" << llendl;
// Run the error handling callback
LLApp::runErrorHandler();
}
else
{
// Everything is okay, a clean exit.
//llinfos << "thread_error - Application exited cleanly" << llendl;
}
//llinfos << "thread_error - Exiting" << llendl;
LLApp::sErrorThreadRunning = FALSE;
}
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