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102 lines
2.9 KiB
C++
102 lines
2.9 KiB
C++
// -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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// vi: set et ts=4 sw=4 sts=4:
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/*
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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Consult the COPYING file in the top-level source directory of this
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module for the precise wording of the license and the list of
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copyright holders.
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*/
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/*!
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* \file
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* \copydoc Opm::ThreadedEntityIterator
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*/
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#ifndef EWOMS_THREADED_ENTITY_ITERATOR_HH
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#define EWOMS_THREADED_ENTITY_ITERATOR_HH
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#include <thread>
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#include <mutex>
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namespace Opm {
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/*!
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* \brief Provides an STL-iterator like interface to iterate over the enties of a
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* GridView in OpenMP threaded applications
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*
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* ATTENTION: This class must be instantiated in a sequential context!
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*/
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template <class GridView, int codim>
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class ThreadedEntityIterator
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{
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using Entity = typename GridView::template Codim<codim>::Entity;
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using EntityIterator = typename GridView::template Codim<codim>::Iterator;
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public:
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ThreadedEntityIterator(const GridView& gridView)
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: gridView_(gridView)
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, sequentialIt_(gridView_.template begin<codim>())
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, sequentialEnd_(gridView.template end<codim>())
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{ }
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ThreadedEntityIterator(const ThreadedEntityIterator& other) = default;
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// begin iterating over the grid in parallel
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EntityIterator beginParallel()
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{
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mutex_.lock();
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auto tmp = sequentialIt_;
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if (sequentialIt_ != sequentialEnd_)
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++sequentialIt_; // make the next thread look at the next element
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mutex_.unlock();
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return tmp;
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}
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// returns true if the last element was reached
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bool isFinished(const EntityIterator& it) const
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{ return it == sequentialEnd_; }
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// make sure that the loop over the grid is finished
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void setFinished()
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{
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mutex_.lock();
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sequentialIt_ = sequentialEnd_;
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mutex_.unlock();
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}
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// prefix increment: goes to the next element which is not yet worked on by any
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// thread
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EntityIterator increment()
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{
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mutex_.lock();
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auto tmp = sequentialIt_;
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if (sequentialIt_ != sequentialEnd_)
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++sequentialIt_;
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mutex_.unlock();
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return tmp;
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}
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private:
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GridView gridView_;
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EntityIterator sequentialIt_;
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EntityIterator sequentialEnd_;
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std::mutex mutex_;
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};
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} // namespace Opm
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#endif
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