/* * 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. */ #ifndef ParallelJobsLibdispatch_h #define ParallelJobsLibdispatch_h #if ENABLE(THREADING_LIBDISPATCH) #include <dispatch/dispatch.h> namespace WTF { static const int maxParallelThreads = 2; class ParallelEnvironment { WTF_MAKE_FAST_ALLOCATED; public: typedef void (*ThreadFunction)(void*); ParallelEnvironment(ThreadFunction threadFunction, size_t sizeOfParameter, int requestedJobNumber) : m_threadFunction(threadFunction), m_sizeOfParameter(sizeOfParameter) { if (!requestedJobNumber || requestedJobNumber > maxParallelThreads) requestedJobNumber = maxParallelThreads; ASSERT(requestedJobNumber > 0); m_numberOfJobs = requestedJobNumber; } int numberOfJobs() { return m_numberOfJobs; } void execute(unsigned char* parameters) { // libdispatch is NOT supported inside a template dispatch_queue_t parallelJobsQueue = dispatch_queue_create("ParallelJobs", 0); for (int i = 0; i < m_numberOfJobs - 1; ++i) { dispatch_async(parallelJobsQueue, ^{(*m_threadFunction)(parameters);}); parameters += m_sizeOfParameter; } // The work for the main thread. Wait until all jobs are done. dispatch_sync(parallelJobsQueue, ^{(*m_threadFunction)(parameters);}); } private: ThreadFunction m_threadFunction; size_t m_sizeOfParameter; int m_numberOfJobs; }; } // namespace WTF #endif // ENABLE(THREADING_LIBDISPATCH) #endif // ParallelJobsLibdispatch_h