amxmodx/dlls/mysqlx/thread/ThreadWorker.cpp

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// vim: set ts=4 sw=4 tw=99 noet:
//
// AMX Mod X, based on AMX Mod by Aleksander Naszko ("OLO").
// Copyright (C) The AMX Mod X Development Team.
//
// This software is licensed under the GNU General Public License, version 3 or higher.
// Additional exceptions apply. For full license details, see LICENSE.txt or visit:
// https://alliedmods.net/amxmodx-license
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#include "ThreadWorker.h"
ThreadWorker::ThreadWorker() :
m_Threader(NULL),
m_QueueLock(NULL),
m_StateLock(NULL),
m_PauseSignal(NULL),
m_AddSignal(NULL),
me(NULL),
m_think_time(DEFAULT_THINK_TIME_MS)
{
m_state = Worker_Invalid;
}
ThreadWorker::ThreadWorker(IThreader *pThreader, unsigned int thinktime) :
m_Threader(pThreader),
m_QueueLock(NULL),
m_StateLock(NULL),
m_PauseSignal(NULL),
m_AddSignal(NULL),
me(NULL),
m_think_time(thinktime)
{
if (m_Threader)
{
m_state = Worker_Stopped;
} else {
m_state = Worker_Invalid;
}
}
ThreadWorker::~ThreadWorker()
{
if (m_state != Worker_Stopped || m_state != Worker_Invalid)
Stop(true);
if (m_ThreadQueue.length())
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Flush(true);
}
void ThreadWorker::OnTerminate(IThreadHandle *pHandle, bool cancel)
{
//we don't particularly care
return;
}
void ThreadWorker::RunThread(IThreadHandle *pHandle)
{
WorkerState this_state = Worker_Running;
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size_t num;
while (true)
{
/**
* Check number of items in the queue
*/
m_StateLock->Lock();
this_state = m_state;
m_StateLock->Unlock();
if (this_state != Worker_Stopped)
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{
m_QueueLock->Lock();
num = m_ThreadQueue.length();
if (!num)
{
/**
* if none, wait for an item
*/
m_Waiting = true;
m_QueueLock->Unlock();
/* first check if we should end again */
if (this_state == Worker_Stopped)
{
break;
}
m_AddSignal->Wait();
m_Waiting = false;
} else {
m_QueueLock->Unlock();
}
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}
m_StateLock->Lock();
this_state = m_state;
m_StateLock->Unlock();
if (this_state != Worker_Running)
{
if (this_state == Worker_Paused || this_state == Worker_Stopped)
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{
//wait until the lock is cleared.
if (this_state == Worker_Paused)
{
m_PauseSignal->Wait();
}
if (this_state == Worker_Stopped)
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{
//if we're supposed to flush cleanrly,
// run all of the remaining frames first.
if (!m_FlushType)
{
while (m_ThreadQueue.length())
RunFrame();
}
break;
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}
}
}
/**
* Run the frame.
*/
RunFrame();
/**
* wait in between threads if specified
*/
if (m_think_time)
m_Threader->ThreadSleep(m_think_time);
}
}
SWThreadHandle *ThreadWorker::PopThreadFromQueue()
{
if (m_state <= Worker_Stopped && !m_QueueLock)
return NULL;
SWThreadHandle *swt;
m_QueueLock->Lock();
swt = BaseWorker::PopThreadFromQueue();
m_QueueLock->Unlock();
return swt;
}
void ThreadWorker::AddThreadToQueue(SWThreadHandle *pHandle)
{
if (m_state <= Worker_Stopped)
return;
m_QueueLock->Lock();
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BaseWorker::AddThreadToQueue(pHandle);
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if (m_Waiting)
{
m_AddSignal->Signal();
}
m_QueueLock->Unlock();
}
WorkerState ThreadWorker::GetStatus(unsigned int *threads)
{
WorkerState state;
m_StateLock->Lock();
state = BaseWorker::GetStatus(threads);
m_StateLock->Unlock();
return state;
}
bool ThreadWorker::Start()
{
if (m_state == Worker_Invalid)
{
if (m_Threader == NULL)
return false;
} else if (m_state != Worker_Stopped) {
return false;
}
m_Waiting = false;
m_QueueLock = m_Threader->MakeMutex();
m_StateLock = m_Threader->MakeMutex();
m_PauseSignal = m_Threader->MakeEventSignal();
m_AddSignal = m_Threader->MakeEventSignal();
m_state = Worker_Running;
ThreadParams pt;
pt.flags = Thread_Default;
pt.prio = ThreadPrio_Normal;
me = m_Threader->MakeThread(this, &pt);
return true;
}
bool ThreadWorker::Stop(bool flush_cancel)
{
if (m_state == Worker_Invalid || m_state == Worker_Stopped)
return false;
WorkerState oldstate;
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//set new state
m_StateLock->Lock();
oldstate = m_state;
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m_state = Worker_Stopped;
m_FlushType = flush_cancel;
m_StateLock->Unlock();
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if (oldstate == Worker_Paused)
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{
Unpause();
} else {
m_QueueLock->Lock();
if (m_Waiting)
{
m_AddSignal->Signal();
}
m_QueueLock->Unlock();
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}
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me->WaitForThread();
//destroy it
me->DestroyThis();
//flush all remaining events
Flush(true);
//free mutex locks
m_QueueLock->DestroyThis();
m_StateLock->DestroyThis();
m_PauseSignal->DestroyThis();
m_AddSignal->DestroyThis();
//invalidizzle
m_QueueLock = NULL;
m_StateLock = NULL;
m_PauseSignal = NULL;
m_AddSignal = NULL;
me = NULL;
return true;
}
bool ThreadWorker::Pause()
{
if (m_state != Worker_Running)
return false;
m_StateLock->Lock();
m_state = Worker_Paused;
m_StateLock->Unlock();
return true;
}
bool ThreadWorker::Unpause()
{
if (m_state != Worker_Paused)
return false;
m_StateLock->Lock();
m_state = Worker_Running;
m_StateLock->Unlock();
m_PauseSignal->Signal();
if (m_Waiting)
{
m_AddSignal->Signal();
}
return true;
}