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/**
* @file llthreadwatchdog.cpp
* @brief The LLThreadWatchdog class definitions
*
* $LicenseInfo:firstyear=2007&license=viewerlgpl$
* 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 "llviewerprecompiledheaders.h"
#include "llwatchdog.h"
#include "llthread.h"
const U32 WATCHDOG_SLEEP_TIME_USEC = 1000000;
// This class runs the watchdog timing thread.
class LLWatchdogTimerThread : public LLThread
{
public:
LLWatchdogTimerThread() :
LLThread("Watchdog"),
mSleepMsecs(0),
mStopping(false)
{
}
~LLWatchdogTimerThread() {}
void setSleepTime(long ms) { mSleepMsecs = ms; }
void stop()
{
mStopping = true;
mSleepMsecs = 1;
}
/* virtual */ void run()
{
while(!mStopping)
{
LLWatchdog::getInstance()->run();
ms_sleep(mSleepMsecs);
}
}
private:
long mSleepMsecs;
bool mStopping;
};
// LLWatchdogEntry
LLWatchdogEntry::LLWatchdogEntry()
{
}
LLWatchdogEntry::~LLWatchdogEntry()
{
stop();
}
void LLWatchdogEntry::start()
{
LLWatchdog::getInstance()->add(this);
}
void LLWatchdogEntry::stop()
{
// this can happen very late in the shutdown sequence
if (! LLWatchdog::wasDeleted())
{
LLWatchdog::getInstance()->remove(this);
}
}
// LLWatchdogTimeout
const std::string UNINIT_STRING = "uninitialized";
LLWatchdogTimeout::LLWatchdogTimeout() :
mTimeout(0.0f),
mPingState(UNINIT_STRING)
{
}
LLWatchdogTimeout::~LLWatchdogTimeout()
{
}
bool LLWatchdogTimeout::isAlive() const
{
return (mTimer.getStarted() && !mTimer.hasExpired());
}
void LLWatchdogTimeout::reset()
{
mTimer.setTimerExpirySec(mTimeout);
}
void LLWatchdogTimeout::setTimeout(F32 d)
{
mTimeout = d;
}
void LLWatchdogTimeout::start(const std::string& state)
{
if (mTimeout == 0)
{
LL_WARNS() << "Cant' start watchdog entry - no timeout set" << LL_ENDL;
return;
}
// Order of operation is very important here.
// After LLWatchdogEntry::start() is called
// LLWatchdogTimeout::isAlive() will be called asynchronously.
ping(state);
mTimer.start();
mTimer.setTimerExpirySec(mTimeout); // timer expiration set to 0 by start()
LLWatchdogEntry::start();
}
void LLWatchdogTimeout::stop()
{
LLWatchdogEntry::stop();
mTimer.stop();
}
void LLWatchdogTimeout::ping(const std::string& state)
{
if(!state.empty())
{
mPingState = state;
}
reset();
}
// LLWatchdog
LLWatchdog::LLWatchdog()
:mSuspectsAccessMutex()
,mTimer(NULL)
,mLastClockCount(0)
{
}
LLWatchdog::~LLWatchdog()
{
}
void LLWatchdog::add(LLWatchdogEntry* e)
{
lockThread();
mSuspects.insert(e);
unlockThread();
}
void LLWatchdog::remove(LLWatchdogEntry* e)
{
lockThread();
mSuspects.erase(e);
unlockThread();
}
void LLWatchdog::init()
{
if(!mSuspectsAccessMutex && !mTimer)
{
mSuspectsAccessMutex = new LLMutex();
mTimer = new LLWatchdogTimerThread();
mTimer->setSleepTime(WATCHDOG_SLEEP_TIME_USEC / 1000);
mLastClockCount = LLTimer::getTotalTime();
// mTimer->start() kicks off the thread, any code after
// start needs to use the mSuspectsAccessMutex
mTimer->start();
}
}
void LLWatchdog::cleanup()
{
if(mTimer)
{
mTimer->stop();
delete mTimer;
mTimer = NULL;
}
if(mSuspectsAccessMutex)
{
delete mSuspectsAccessMutex;
mSuspectsAccessMutex = NULL;
}
mLastClockCount = 0;
}
void LLWatchdog::run()
{
lockThread();
// Check the time since the last call to run...
// If the time elapsed is two times greater than the regualr sleep time
// reset the active timeouts.
const U32 TIME_ELAPSED_MULTIPLIER = 2;
U64 current_time = LLTimer::getTotalTime();
U64 current_run_delta = current_time - mLastClockCount;
mLastClockCount = current_time;
if(current_run_delta > (WATCHDOG_SLEEP_TIME_USEC * TIME_ELAPSED_MULTIPLIER))
{
LL_INFOS() << "Watchdog thread delayed: resetting entries." << LL_ENDL;
std::for_each(mSuspects.begin(),
mSuspects.end(),
[](SuspectsRegistry::value_type suspect){ suspect->reset(); }
);
}
else
{
SuspectsRegistry::iterator result =
std::find_if(mSuspects.begin(),
mSuspects.end(),
[](SuspectsRegistry::value_type suspect){ return ! suspect->isAlive(); }
);
if(result != mSuspects.end())
{
// error!!!
if(mTimer)
{
mTimer->stop();
}
LL_ERRS() << "Watchdog timer expired; assuming viewer is hung and crashing" << LL_ENDL;
}
}
unlockThread();
}
void LLWatchdog::lockThread()
{
if(mSuspectsAccessMutex != NULL)
{
mSuspectsAccessMutex->lock();
}
}
void LLWatchdog::unlockThread()
{
if(mSuspectsAccessMutex != NULL)
{
mSuspectsAccessMutex->unlock();
}
}
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