426 lines
9.2 KiB
C++
Executable File
426 lines
9.2 KiB
C++
Executable File
/**
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* @file llthread.cpp
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*
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* $LicenseInfo:firstyear=2004&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010-2013, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#include "linden_common.h"
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#include "llapr.h"
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#include "apr_portable.h"
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#include "llthread.h"
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#include "llmutex.h"
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#include "lltimer.h"
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#include "lltrace.h"
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#include "lltracethreadrecorder.h"
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#if LL_LINUX || LL_SOLARIS
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#include <sched.h>
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#endif
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#ifdef LL_WINDOWS
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const DWORD MS_VC_EXCEPTION=0x406D1388;
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#pragma pack(push,8)
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typedef struct tagTHREADNAME_INFO
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{
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DWORD dwType; // Must be 0x1000.
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LPCSTR szName; // Pointer to name (in user addr space).
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DWORD dwThreadID; // Thread ID (-1=caller thread).
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DWORD dwFlags; // Reserved for future use, must be zero.
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} THREADNAME_INFO;
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#pragma pack(pop)
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void set_thread_name( DWORD dwThreadID, const char* threadName)
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{
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THREADNAME_INFO info;
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info.dwType = 0x1000;
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info.szName = threadName;
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info.dwThreadID = dwThreadID;
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info.dwFlags = 0;
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__try
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{
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::RaiseException( MS_VC_EXCEPTION, 0, sizeof(info)/sizeof(DWORD), (DWORD*)&info );
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}
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__except(EXCEPTION_CONTINUE_EXECUTION)
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{
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}
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}
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#endif
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//----------------------------------------------------------------------------
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// Usage:
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// void run_func(LLThread* thread)
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// {
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// }
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// LLThread* thread = new LLThread();
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// thread->run(run_func);
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// ...
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// thread->setQuitting();
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// while(!timeout)
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// {
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// if (thread->isStopped())
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// {
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// delete thread;
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// break;
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// }
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// }
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//
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//----------------------------------------------------------------------------
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#if LL_WINDOWS
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U32 __declspec(thread) sThreadID = 0;
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#else
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U32 __thread sThreadID = 0;
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#endif
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U32 LLThread::sIDIter = 0;
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LL_COMMON_API void assert_main_thread()
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{
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static U32 s_thread_id = LLThread::currentID();
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if (LLThread::currentID() != s_thread_id)
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{
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LL_WARNS() << "Illegal execution from thread id " << (S32) LLThread::currentID()
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<< " outside main thread " << (S32) s_thread_id << LL_ENDL;
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}
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}
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void LLThread::registerThreadID()
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{
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sThreadID = ++sIDIter;
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}
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//
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// Handed to the APR thread creation function
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//
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void *APR_THREAD_FUNC LLThread::staticRun(apr_thread_t *apr_threadp, void *datap)
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{
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LLThread *threadp = (LLThread *)datap;
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#ifdef LL_WINDOWS
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set_thread_name(-1, threadp->mName.c_str());
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#endif
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// for now, hard code all LLThreads to report to single master thread recorder, which is known to be running on main thread
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threadp->mRecorder = new LLTrace::ThreadRecorder(*LLTrace::get_master_thread_recorder());
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sThreadID = threadp->mID;
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// Run the user supplied function
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threadp->run();
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//LL_INFOS() << "LLThread::staticRun() Exiting: " << threadp->mName << LL_ENDL;
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delete threadp->mRecorder;
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threadp->mRecorder = NULL;
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// We're done with the run function, this thread is done executing now.
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//NB: we are using this flag to sync across threads...we really need memory barriers here
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threadp->mStatus = STOPPED;
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return NULL;
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}
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LLThread::LLThread(const std::string& name, apr_pool_t *poolp) :
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mPaused(FALSE),
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mName(name),
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mAPRThreadp(NULL),
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mStatus(STOPPED),
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mRecorder(NULL)
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{
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mID = ++sIDIter;
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// Thread creation probably CAN be paranoid about APR being initialized, if necessary
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if (poolp)
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{
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mIsLocalPool = FALSE;
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mAPRPoolp = poolp;
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}
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else
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{
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mIsLocalPool = TRUE;
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apr_pool_create(&mAPRPoolp, NULL); // Create a subpool for this thread
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}
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mRunCondition = new LLCondition(mAPRPoolp);
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mDataLock = new LLMutex(mAPRPoolp);
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mLocalAPRFilePoolp = NULL ;
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}
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LLThread::~LLThread()
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{
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shutdown();
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if(mLocalAPRFilePoolp)
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{
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delete mLocalAPRFilePoolp ;
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mLocalAPRFilePoolp = NULL ;
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}
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}
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void LLThread::shutdown()
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{
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// Warning! If you somehow call the thread destructor from itself,
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// the thread will die in an unclean fashion!
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if (mAPRThreadp)
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{
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if (!isStopped())
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{
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// The thread isn't already stopped
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// First, set the flag that indicates that we're ready to die
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setQuitting();
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//LL_INFOS() << "LLThread::~LLThread() Killing thread " << mName << " Status: " << mStatus << LL_ENDL;
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// Now wait a bit for the thread to exit
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// It's unclear whether I should even bother doing this - this destructor
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// should never get called unless we're already stopped, really...
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S32 counter = 0;
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const S32 MAX_WAIT = 600;
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while (counter < MAX_WAIT)
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{
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if (isStopped())
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{
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break;
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}
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// Sleep for a tenth of a second
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ms_sleep(100);
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yield();
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counter++;
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}
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}
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if (!isStopped())
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{
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// This thread just wouldn't stop, even though we gave it time
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//LL_WARNS() << "LLThread::~LLThread() exiting thread before clean exit!" << LL_ENDL;
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// Put a stake in its heart.
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delete mRecorder;
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apr_thread_exit(mAPRThreadp, -1);
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return;
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}
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mAPRThreadp = NULL;
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}
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delete mRunCondition;
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mRunCondition = NULL;
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delete mDataLock;
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mDataLock = NULL;
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if (mIsLocalPool && mAPRPoolp)
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{
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apr_pool_destroy(mAPRPoolp);
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mAPRPoolp = 0;
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}
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if (mRecorder)
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{
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// missed chance to properly shut down recorder (needs to be done in thread context)
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// probably due to abnormal thread termination
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// so just leak it and remove it from parent
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LLTrace::get_master_thread_recorder()->removeChildRecorder(mRecorder);
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}
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}
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void LLThread::start()
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{
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llassert(isStopped());
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// Set thread state to running
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mStatus = RUNNING;
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apr_status_t status =
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apr_thread_create(&mAPRThreadp, NULL, staticRun, (void *)this, mAPRPoolp);
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if(status == APR_SUCCESS)
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{
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// We won't bother joining
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apr_thread_detach(mAPRThreadp);
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}
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else
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{
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mStatus = STOPPED;
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LL_WARNS() << "failed to start thread " << mName << LL_ENDL;
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ll_apr_warn_status(status);
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}
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}
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//============================================================================
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// Called from MAIN THREAD.
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// Request that the thread pause/resume.
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// The thread will pause when (and if) it calls checkPause()
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void LLThread::pause()
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{
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if (!mPaused)
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{
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// this will cause the thread to stop execution as soon as checkPause() is called
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mPaused = 1; // Does not need to be atomic since this is only set/unset from the main thread
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}
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}
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void LLThread::unpause()
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{
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if (mPaused)
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{
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mPaused = 0;
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}
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wake(); // wake up the thread if necessary
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}
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// virtual predicate function -- returns true if the thread should wake up, false if it should sleep.
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bool LLThread::runCondition(void)
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{
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// by default, always run. Handling of pause/unpause is done regardless of this function's result.
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return true;
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}
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//============================================================================
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// Called from run() (CHILD THREAD).
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// Stop thread execution if requested until unpaused.
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void LLThread::checkPause()
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{
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mDataLock->lock();
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// This is in a while loop because the pthread API allows for spurious wakeups.
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while(shouldSleep())
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{
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mDataLock->unlock();
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mRunCondition->wait(); // unlocks mRunCondition
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mDataLock->lock();
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// mRunCondition is locked when the thread wakes up
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}
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mDataLock->unlock();
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}
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//============================================================================
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void LLThread::setQuitting()
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{
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mDataLock->lock();
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if (mStatus == RUNNING)
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{
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mStatus = QUITTING;
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}
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mDataLock->unlock();
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wake();
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}
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// static
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U32 LLThread::currentID()
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{
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return sThreadID;
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}
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// static
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void LLThread::yield()
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{
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#if LL_LINUX || LL_SOLARIS
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sched_yield(); // annoyingly, apr_thread_yield is a noop on linux...
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#else
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apr_thread_yield();
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#endif
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}
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void LLThread::wake()
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{
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mDataLock->lock();
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if(!shouldSleep())
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{
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mRunCondition->signal();
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}
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mDataLock->unlock();
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}
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void LLThread::wakeLocked()
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{
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if(!shouldSleep())
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{
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mRunCondition->signal();
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}
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}
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//============================================================================
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//----------------------------------------------------------------------------
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//static
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LLMutex* LLThreadSafeRefCount::sMutex = 0;
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//static
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void LLThreadSafeRefCount::initThreadSafeRefCount()
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{
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if (!sMutex)
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{
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sMutex = new LLMutex(0);
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}
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}
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//static
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void LLThreadSafeRefCount::cleanupThreadSafeRefCount()
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{
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delete sMutex;
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sMutex = NULL;
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}
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//----------------------------------------------------------------------------
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LLThreadSafeRefCount::LLThreadSafeRefCount() :
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mRef(0)
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{
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}
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LLThreadSafeRefCount::LLThreadSafeRefCount(const LLThreadSafeRefCount& src)
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{
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mRef = 0;
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}
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LLThreadSafeRefCount::~LLThreadSafeRefCount()
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{
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if (mRef != 0)
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{
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LL_ERRS() << "deleting non-zero reference" << LL_ENDL;
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}
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}
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//============================================================================
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LLResponder::~LLResponder()
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{
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}
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//============================================================================
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