mirror of
https://github.com/darlinghq/darling-WTF.git
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140 lines
4.4 KiB
C++
140 lines
4.4 KiB
C++
/*
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* Copyright (C) 2011 University of Szeged
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* Copyright (C) 2011 Gabor Loki <loki@webkit.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY UNIVERSITY OF SZEGED ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UNIVERSITY OF SZEGED OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "config.h"
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#if ENABLE(THREADING_GENERIC)
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#include "ParallelJobs.h"
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#include <wtf/NumberOfCores.h>
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namespace WTF {
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Vector< RefPtr<ParallelEnvironment::ThreadPrivate> >* ParallelEnvironment::s_threadPool = 0;
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ParallelEnvironment::ParallelEnvironment(ThreadFunction threadFunction, size_t sizeOfParameter, int requestedJobNumber) :
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m_threadFunction(threadFunction),
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m_sizeOfParameter(sizeOfParameter)
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{
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ASSERT_ARG(requestedJobNumber, requestedJobNumber >= 1);
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int maxNumberOfCores = numberOfProcessorCores();
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if (!requestedJobNumber || requestedJobNumber > maxNumberOfCores)
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requestedJobNumber = static_cast<unsigned>(maxNumberOfCores);
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if (!s_threadPool)
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s_threadPool = new Vector< RefPtr<ThreadPrivate> >();
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// The main thread should be also a worker.
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int maxNumberOfNewThreads = requestedJobNumber - 1;
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for (int i = 0; i < maxNumberOfCores && m_threads.size() < static_cast<unsigned>(maxNumberOfNewThreads); ++i) {
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if (s_threadPool->size() < static_cast<unsigned>(i) + 1U)
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s_threadPool->append(ThreadPrivate::create());
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if ((*s_threadPool)[i]->tryLockFor(this))
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m_threads.append((*s_threadPool)[i]);
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}
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m_numberOfJobs = m_threads.size() + 1;
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}
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void ParallelEnvironment::execute(void* parameters)
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{
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unsigned char* currentParameter = static_cast<unsigned char*>(parameters);
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size_t i;
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for (i = 0; i < m_threads.size(); ++i) {
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m_threads[i]->execute(m_threadFunction, currentParameter);
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currentParameter += m_sizeOfParameter;
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}
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// The work for the main thread.
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(*m_threadFunction)(currentParameter);
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// Wait until all jobs are done.
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for (i = 0; i < m_threads.size(); ++i)
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m_threads[i]->waitForFinish();
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}
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bool ParallelEnvironment::ThreadPrivate::tryLockFor(ParallelEnvironment* parent)
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{
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bool locked = m_mutex.tryLock();
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if (!locked)
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return false;
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if (m_parent) {
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m_mutex.unlock();
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return false;
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}
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if (!m_thread) {
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m_thread = Thread::create("Parallel worker", [this] {
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LockHolder lock(m_mutex);
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while (m_thread) {
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if (m_running) {
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(*m_threadFunction)(m_parameters);
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m_running = false;
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m_parent = 0;
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m_threadCondition.notifyOne();
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}
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m_threadCondition.wait(m_mutex);
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}
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});
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}
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if (m_thread)
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m_parent = parent;
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m_mutex.unlock();
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return m_thread;
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}
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void ParallelEnvironment::ThreadPrivate::execute(ThreadFunction threadFunction, void* parameters)
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{
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LockHolder lock(m_mutex);
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m_threadFunction = threadFunction;
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m_parameters = parameters;
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m_running = true;
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m_threadCondition.notifyOne();
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}
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void ParallelEnvironment::ThreadPrivate::waitForFinish()
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{
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LockHolder lock(m_mutex);
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while (m_running)
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m_threadCondition.wait(m_mutex);
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}
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} // namespace WTF
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#endif // ENABLE(THREADING_GENERIC)
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