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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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* 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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* 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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* 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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#ifndef ParallelJobsOpenMP_h
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#define ParallelJobsOpenMP_h
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#if ENABLE(THREADING_OPENMP)
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class ParallelEnvironment {
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WTF_MAKE_NONCOPYABLE(ParallelEnvironment);
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typedef void (*ThreadFunction)(void*);
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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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int maxNumberOfThreads = omp_get_max_threads();
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if (!requestedJobNumber || requestedJobNumber > maxNumberOfThreads)
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requestedJobNumber = maxNumberOfThreads;
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ASSERT(requestedJobNumber > 0);
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m_numberOfJobs = requestedJobNumber;
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return m_numberOfJobs;
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void execute(unsigned char* parameters)
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omp_set_num_threads(m_numberOfJobs);
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#pragma omp parallel for
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for (int i = 0; i < m_numberOfJobs; ++i)
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(*m_threadFunction)(parameters + i * m_sizeOfParameter);
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ThreadFunction m_threadFunction;
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size_t m_sizeOfParameter;
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#endif // ENABLE(THREADING_OPENMP)
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#endif // ParallelJobsOpenMP_h