239 lines
7.5 KiB
C++
239 lines
7.5 KiB
C++
// -*- C++ -*-
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// Copyright (C) 2007-2017 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the terms
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// of the GNU General Public License as published by the Free Software
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// Foundation; either version 3, or (at your option) any later
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// version.
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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/** @file parallel/sort.h
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* @brief Parallel sorting algorithm switch.
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* This file is a GNU parallel extension to the Standard C++ Library.
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*/
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// Written by Johannes Singler.
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#ifndef _GLIBCXX_PARALLEL_SORT_H
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#define _GLIBCXX_PARALLEL_SORT_H 1
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#include <parallel/basic_iterator.h>
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#include <parallel/features.h>
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#include <parallel/parallel.h>
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#if _GLIBCXX_PARALLEL_ASSERTIONS
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#include <parallel/checkers.h>
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#endif
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#if _GLIBCXX_MERGESORT
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#include <parallel/multiway_mergesort.h>
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#endif
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#if _GLIBCXX_QUICKSORT
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#include <parallel/quicksort.h>
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#endif
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#if _GLIBCXX_BAL_QUICKSORT
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#include <parallel/balanced_quicksort.h>
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#endif
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namespace __gnu_parallel
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{
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//prototype
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template<bool __stable, typename _RAIter,
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typename _Compare, typename _Parallelism>
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void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp, _Parallelism __parallelism);
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/**
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* @brief Choose multiway mergesort, splitting variant at run-time,
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* for parallel sorting.
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* @param __begin Begin iterator of input sequence.
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* @param __end End iterator of input sequence.
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* @param __comp Comparator.
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* @tparam __stable Sort stable.
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* @callgraph
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*/
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template<bool __stable, typename _RAIter, typename _Compare>
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inline void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp, multiway_mergesort_tag __parallelism)
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{
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_GLIBCXX_CALL(__end - __begin)
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if(_Settings::get().sort_splitting == EXACT)
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parallel_sort_mwms<__stable, true>
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(__begin, __end, __comp, __parallelism.__get_num_threads());
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else
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parallel_sort_mwms<__stable, false>
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(__begin, __end, __comp, __parallelism.__get_num_threads());
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}
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/**
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* @brief Choose multiway mergesort with exact splitting,
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* for parallel sorting.
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* @param __begin Begin iterator of input sequence.
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* @param __end End iterator of input sequence.
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* @param __comp Comparator.
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* @tparam __stable Sort stable.
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* @callgraph
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*/
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template<bool __stable, typename _RAIter, typename _Compare>
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inline void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp,
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multiway_mergesort_exact_tag __parallelism)
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{
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_GLIBCXX_CALL(__end - __begin)
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parallel_sort_mwms<__stable, true>
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(__begin, __end, __comp, __parallelism.__get_num_threads());
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}
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/**
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* @brief Choose multiway mergesort with splitting by sampling,
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* for parallel sorting.
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* @param __begin Begin iterator of input sequence.
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* @param __end End iterator of input sequence.
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* @param __comp Comparator.
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* @tparam __stable Sort stable.
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* @callgraph
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*/
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template<bool __stable, typename _RAIter, typename _Compare>
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inline void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp,
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multiway_mergesort_sampling_tag __parallelism)
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{
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_GLIBCXX_CALL(__end - __begin)
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parallel_sort_mwms<__stable, false>
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(__begin, __end, __comp, __parallelism.__get_num_threads());
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}
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/**
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* @brief Choose quicksort for parallel sorting.
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* @param __begin Begin iterator of input sequence.
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* @param __end End iterator of input sequence.
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* @param __comp Comparator.
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* @tparam __stable Sort stable.
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* @callgraph
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*/
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template<bool __stable, typename _RAIter, typename _Compare>
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inline void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp, quicksort_tag __parallelism)
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{
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_GLIBCXX_CALL(__end - __begin)
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_GLIBCXX_PARALLEL_ASSERT(__stable == false);
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__parallel_sort_qs(__begin, __end, __comp,
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__parallelism.__get_num_threads());
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}
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/**
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* @brief Choose balanced quicksort for parallel sorting.
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* @param __begin Begin iterator of input sequence.
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* @param __end End iterator of input sequence.
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* @param __comp Comparator.
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* @tparam __stable Sort stable.
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* @callgraph
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*/
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template<bool __stable, typename _RAIter, typename _Compare>
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inline void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp, balanced_quicksort_tag __parallelism)
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{
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_GLIBCXX_CALL(__end - __begin)
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_GLIBCXX_PARALLEL_ASSERT(__stable == false);
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__parallel_sort_qsb(__begin, __end, __comp,
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__parallelism.__get_num_threads());
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}
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/**
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* @brief Choose multiway mergesort with exact splitting,
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* for parallel sorting.
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* @param __begin Begin iterator of input sequence.
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* @param __end End iterator of input sequence.
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* @param __comp Comparator.
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* @tparam __stable Sort stable.
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* @callgraph
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*/
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template<bool __stable, typename _RAIter, typename _Compare>
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inline void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp, default_parallel_tag __parallelism)
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{
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_GLIBCXX_CALL(__end - __begin)
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__parallel_sort<__stable>
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(__begin, __end, __comp,
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multiway_mergesort_exact_tag(__parallelism.__get_num_threads()));
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}
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/**
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* @brief Choose a parallel sorting algorithm.
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* @param __begin Begin iterator of input sequence.
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* @param __end End iterator of input sequence.
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* @param __comp Comparator.
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* @tparam __stable Sort stable.
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* @callgraph
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*/
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template<bool __stable, typename _RAIter, typename _Compare>
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inline void
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__parallel_sort(_RAIter __begin, _RAIter __end,
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_Compare __comp, parallel_tag __parallelism)
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{
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_GLIBCXX_CALL(__end - __begin)
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typedef std::iterator_traits<_RAIter> _TraitsType;
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typedef typename _TraitsType::value_type _ValueType;
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typedef typename _TraitsType::difference_type _DifferenceType;
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if (false) ;
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#if _GLIBCXX_MERGESORT
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else if (__stable || _Settings::get().sort_algorithm == MWMS)
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{
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if(_Settings::get().sort_splitting == EXACT)
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parallel_sort_mwms<__stable, true>
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(__begin, __end, __comp, __parallelism.__get_num_threads());
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else
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parallel_sort_mwms<false, false>
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(__begin, __end, __comp, __parallelism.__get_num_threads());
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}
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#endif
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#if _GLIBCXX_QUICKSORT
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else if (_Settings::get().sort_algorithm == QS)
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__parallel_sort_qs(__begin, __end, __comp,
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__parallelism.__get_num_threads());
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#endif
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#if _GLIBCXX_BAL_QUICKSORT
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else if (_Settings::get().sort_algorithm == QS_BALANCED)
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__parallel_sort_qsb(__begin, __end, __comp,
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__parallelism.__get_num_threads());
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#endif
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else
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__gnu_sequential::sort(__begin, __end, __comp);
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}
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} // end namespace __gnu_parallel
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#endif /* _GLIBCXX_PARALLEL_SORT_H */
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