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/*
* Copyright (C) 2011 University of Szeged
* Copyright (C) 2011 Gabor Loki <loki@webkit.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#if ENABLE(PARALLEL_JOBS) && ENABLE(THREADING_GENERIC)
#include "ParallelJobs.h"
namespace WTF {
Vector< RefPtr<ParallelEnvironment::ThreadPrivate> >* ParallelEnvironment::s_threadPool = 0;
bool ParallelEnvironment::ThreadPrivate::tryLockFor(ParallelEnvironment* parent)
{
bool locked = m_mutex.tryLock();
if (!locked)
return false;
if (m_parent) {
m_mutex.unlock();
return false;
}
if (!m_threadID)
m_threadID = createThread(&ParallelEnvironment::ThreadPrivate::workerThread, this, "Parallel worker");
if (m_threadID)
m_parent = parent;
m_mutex.unlock();
return m_threadID;
}
void ParallelEnvironment::ThreadPrivate::execute(ThreadFunction threadFunction, void* parameters)
{
MutexLocker lock(m_mutex);
m_threadFunction = threadFunction;
m_parameters = parameters;
m_running = true;
m_threadCondition.signal();
}
void ParallelEnvironment::ThreadPrivate::waitForFinish()
{
MutexLocker lock(m_mutex);
while (m_running)
m_threadCondition.wait(m_mutex);
}
void* ParallelEnvironment::ThreadPrivate::workerThread(void* threadData)
{
ThreadPrivate* sharedThread = reinterpret_cast<ThreadPrivate*>(threadData);
MutexLocker lock(sharedThread->m_mutex);
while (sharedThread->m_threadID) {
if (sharedThread->m_running) {
(*sharedThread->m_threadFunction)(sharedThread->m_parameters);
sharedThread->m_running = false;
sharedThread->m_parent = 0;
sharedThread->m_threadCondition.signal();
}
sharedThread->m_threadCondition.wait(sharedThread->m_mutex);
}
return 0;
}
} // namespace WTF
#endif // ENABLE(PARALLEL_JOBS) && ENABLE(THREADING_GENERIC)
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