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77 lines
2.9 KiB
C++
77 lines
2.9 KiB
C++
/*============================================================================*/
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/*
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VFLib: https://github.com/vinniefalco/VFLib
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Copyright (C) 2008 by Vinnie Falco <vinnie.falco@gmail.com>
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This library contains portions of other open source products covered by
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separate licenses. Please see the corresponding source files for specific
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terms.
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VFLib is provided under the terms of The MIT License (MIT):
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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IN THE SOFTWARE.
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*/
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/*============================================================================*/
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ParallelFor::ParallelFor (ThreadGroup& pool)
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: m_pool (pool)
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, m_finishedEvent (false) // auto-reset
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{
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}
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int ParallelFor::getNumberOfThreads () const
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{
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return m_pool.getNumberOfThreads ();
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}
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void ParallelFor::doLoop (int numberOfIterations, Iteration& iteration)
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{
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if (numberOfIterations > 1)
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{
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int const numberOfThreads = m_pool.getNumberOfThreads ();
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// The largest number of pool threads we need is one less than the number
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// of iterations, because we also run the loop body on the caller's thread.
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//
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int const maxThreads = numberOfIterations - 1;
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// Calculate the number of parallel instances as the smaller of the number
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// of threads available (including the caller's) and the number of iterations.
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//
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int const numberOfParallelInstances = std::min (
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numberOfThreads + 1, numberOfIterations);
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LoopState* loopState (new (m_pool.getAllocator ()) LoopState (
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iteration, m_finishedEvent, numberOfIterations, numberOfParallelInstances));
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m_pool.call (maxThreads, &LoopState::forLoopBody, loopState);
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// Also use the caller's thread to run the loop body.
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loopState->forLoopBody ();
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m_finishedEvent.wait ();
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}
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else if (numberOfIterations == 1)
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{
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// Just one iteration, so do it.
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iteration (0);
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}
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}
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