From 38be0d13830efd2d98281c645c3a60afe05ffece Mon Sep 17 00:00:00 2001 From: Qt by Nokia Date: Wed, 27 Apr 2011 12:05:43 +0200 Subject: Initial import from the monolithic Qt. This is the beginning of revision history for this module. If you want to look at revision history older than this, please refer to the Qt Git wiki for how to use Git history grafting. At the time of writing, this wiki is located here: http://qt.gitorious.org/qt/pages/GitIntroductionWithQt If you have already performed the grafting and you don't see any history beyond this commit, try running "git log" with the "--follow" argument. Branched from the monolithic repo, Qt master branch, at commit 896db169ea224deb96c59ce8af800d019de63f12 --- src/corelib/concurrent/qtconcurrentmapkernel.h | 273 +++++++++++++++++++++++++ 1 file changed, 273 insertions(+) create mode 100644 src/corelib/concurrent/qtconcurrentmapkernel.h (limited to 'src/corelib/concurrent/qtconcurrentmapkernel.h') diff --git a/src/corelib/concurrent/qtconcurrentmapkernel.h b/src/corelib/concurrent/qtconcurrentmapkernel.h new file mode 100644 index 00000000000..20b9944b16d --- /dev/null +++ b/src/corelib/concurrent/qtconcurrentmapkernel.h @@ -0,0 +1,273 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#ifndef QTCONCURRENT_MAPKERNEL_H +#define QTCONCURRENT_MAPKERNEL_H + +#include + +#ifndef QT_NO_CONCURRENT + +#include +#include + +QT_BEGIN_HEADER +QT_BEGIN_NAMESPACE + +QT_MODULE(Core) + +#ifndef qdoc +namespace QtConcurrent { + +// map kernel, works with both parallel-for and parallel-while +template +class MapKernel : public IterateKernel +{ + MapFunctor map; +public: + typedef void ReturnType; + MapKernel(Iterator begin, Iterator end, MapFunctor _map) + : IterateKernel(begin, end), map(_map) + { } + + bool runIteration(Iterator it, int, void *) + { + map(*it); + return false; + } + + bool runIterations(Iterator sequenceBeginIterator, int beginIndex, int endIndex, void *) + { + Iterator it = sequenceBeginIterator; + advance(it, beginIndex); + for (int i = beginIndex; i < endIndex; ++i) { + runIteration(it, i, 0); + advance(it, 1); + } + + return false; + } +}; + +template > +class MappedReducedKernel : public IterateKernel +{ + ReducedResultType reducedResult; + MapFunctor map; + ReduceFunctor reduce; + Reducer reducer; +public: + typedef ReducedResultType ReturnType; + MappedReducedKernel(Iterator begin, Iterator end, MapFunctor _map, ReduceFunctor _reduce, ReduceOptions reduceOptions) + : IterateKernel(begin, end), reducedResult(), map(_map), reduce(_reduce), reducer(reduceOptions) + { } + + MappedReducedKernel(ReducedResultType initialValue, + MapFunctor _map, + ReduceFunctor _reduce) + : reducedResult(initialValue), map(_map), reduce(_reduce) + { } + + bool runIteration(Iterator it, int index, ReducedResultType *) + { + IntermediateResults results; + results.begin = index; + results.end = index + 1; + + results.vector.append(map(*it)); + reducer.runReduce(reduce, reducedResult, results); + return false; + } + + bool runIterations(Iterator sequenceBeginIterator, int begin, int end, ReducedResultType *) + { + IntermediateResults results; + results.begin = begin; + results.end = end; + results.vector.reserve(end - begin); + + Iterator it = sequenceBeginIterator; + advance(it, begin); + for (int i = begin; i < end; ++i) { + results.vector.append(map(*(it))); + advance(it, 1); + } + + reducer.runReduce(reduce, reducedResult, results); + return false; + } + + void finish() + { + reducer.finish(reduce, reducedResult); + } + + bool shouldThrottleThread() + { + return IterateKernel::shouldThrottleThread() || reducer.shouldThrottle(); + } + + bool shouldStartThread() + { + return IterateKernel::shouldStartThread() && reducer.shouldStartThread(); + } + + typedef ReducedResultType ResultType; + ReducedResultType *result() + { + return &reducedResult; + } +}; + +template +class MappedEachKernel : public IterateKernel +{ + MapFunctor map; + typedef typename MapFunctor::result_type T; +public: + typedef T ReturnType; + typedef T ResultType; + + MappedEachKernel(Iterator begin, Iterator end, MapFunctor _map) + : IterateKernel(begin, end), map(_map) { } + + bool runIteration(Iterator it, int, T *result) + { + *result = map(*it); + return true; + } + + bool runIterations(Iterator sequenceBeginIterator, int begin, int end, T *results) + { + + Iterator it = sequenceBeginIterator; + advance(it, begin); + for (int i = begin; i < end; ++i) { + runIteration(it, i, results + (i - begin)); + advance(it, 1); + } + + return true; + } +}; + +template +inline ThreadEngineStarter startMap(Iterator begin, Iterator end, Functor functor) +{ + return startThreadEngine(new MapKernel(begin, end, functor)); +} + +template +inline ThreadEngineStarter startMapped(Iterator begin, Iterator end, Functor functor) +{ + return startThreadEngine(new MappedEachKernel(begin, end, functor)); +} + +/* + The SequnceHolder class is used to hold a reference to the + sequence we are working on. +*/ +template +struct SequenceHolder1 : public Base +{ + SequenceHolder1(const Sequence &_sequence, Functor functor) + : Base(_sequence.begin(), _sequence.end(), functor), sequence(_sequence) + { } + + Sequence sequence; + + void finish() + { + Base::finish(); + // Clear the sequence to make sure all temporaries are destroyed + // before finished is signaled. + sequence = Sequence(); + } +}; + +template +inline ThreadEngineStarter startMapped(const Sequence &sequence, Functor functor) +{ + typedef SequenceHolder1, Functor> + SequenceHolderType; + + return startThreadEngine(new SequenceHolderType(sequence, functor)); +} + +template +inline ThreadEngineStarter startMappedReduced(const Sequence & sequence, + MapFunctor mapFunctor, ReduceFunctor reduceFunctor, + ReduceOptions options) +{ + typedef typename Sequence::const_iterator Iterator; + typedef ReduceKernel Reducer; + typedef MappedReducedKernel MappedReduceType; + typedef SequenceHolder2 SequenceHolderType; + return startThreadEngine(new SequenceHolderType(sequence, mapFunctor, reduceFunctor, options)); +} + +template +inline ThreadEngineStarter startMappedReduced(Iterator begin, Iterator end, + MapFunctor mapFunctor, ReduceFunctor reduceFunctor, + ReduceOptions options) +{ + typedef ReduceKernel Reducer; + typedef MappedReducedKernel MappedReduceType; + return startThreadEngine(new MappedReduceType(begin, end, mapFunctor, reduceFunctor, options)); +} + +} // namespace QtConcurrent + +#endif //qdoc + +QT_END_NAMESPACE +QT_END_HEADER + +#endif // QT_NO_CONCURRENT + +#endif -- cgit v1.2.3