// -*- C++ -*- // Copyright (C) 2007-2020 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the terms // of the GNU General Public License as published by the Free Software // Foundation; either version 3, or (at your option) any later // version. // This library is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file parallel/sort.h * @brief Parallel sorting algorithm switch. * This file is a GNU parallel extension to the Standard C++ Library. */ // Written by Johannes Singler. #ifndef _GLIBCXX_PARALLEL_SORT_H #define _GLIBCXX_PARALLEL_SORT_H 1 #include <parallel/basic_iterator.h> #include <parallel/features.h> #include <parallel/parallel.h> #if _GLIBCXX_PARALLEL_ASSERTIONS #include <parallel/checkers.h> #endif #if _GLIBCXX_MERGESORT #include <parallel/multiway_mergesort.h> #endif #if _GLIBCXX_QUICKSORT #include <parallel/quicksort.h> #endif #if _GLIBCXX_BAL_QUICKSORT #include <parallel/balanced_quicksort.h> #endif namespace __gnu_parallel { //prototype template<bool __stable, typename _RAIter, typename _Compare, typename _Parallelism> void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, _Parallelism __parallelism); /** * @brief Choose multiway mergesort, splitting variant at run-time, * for parallel sorting. * @param __begin Begin iterator of input sequence. * @param __end End iterator of input sequence. * @param __comp Comparator. * @tparam __stable Sort stable. * @callgraph */ template<bool __stable, typename _RAIter, typename _Compare> inline void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, multiway_mergesort_tag __parallelism) { _GLIBCXX_CALL(__end - __begin) if(_Settings::get().sort_splitting == EXACT) parallel_sort_mwms<__stable, true> (__begin, __end, __comp, __parallelism.__get_num_threads()); else parallel_sort_mwms<__stable, false> (__begin, __end, __comp, __parallelism.__get_num_threads()); } /** * @brief Choose multiway mergesort with exact splitting, * for parallel sorting. * @param __begin Begin iterator of input sequence. * @param __end End iterator of input sequence. * @param __comp Comparator. * @tparam __stable Sort stable. * @callgraph */ template<bool __stable, typename _RAIter, typename _Compare> inline void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, multiway_mergesort_exact_tag __parallelism) { _GLIBCXX_CALL(__end - __begin) parallel_sort_mwms<__stable, true> (__begin, __end, __comp, __parallelism.__get_num_threads()); } /** * @brief Choose multiway mergesort with splitting by sampling, * for parallel sorting. * @param __begin Begin iterator of input sequence. * @param __end End iterator of input sequence. * @param __comp Comparator. * @tparam __stable Sort stable. * @callgraph */ template<bool __stable, typename _RAIter, typename _Compare> inline void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, multiway_mergesort_sampling_tag __parallelism) { _GLIBCXX_CALL(__end - __begin) parallel_sort_mwms<__stable, false> (__begin, __end, __comp, __parallelism.__get_num_threads()); } /** * @brief Choose quicksort for parallel sorting. * @param __begin Begin iterator of input sequence. * @param __end End iterator of input sequence. * @param __comp Comparator. * @tparam __stable Sort stable. * @callgraph */ template<bool __stable, typename _RAIter, typename _Compare> inline void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, quicksort_tag __parallelism) { _GLIBCXX_CALL(__end - __begin) _GLIBCXX_PARALLEL_ASSERT(__stable == false); __parallel_sort_qs(__begin, __end, __comp, __parallelism.__get_num_threads()); } /** * @brief Choose balanced quicksort for parallel sorting. * @param __begin Begin iterator of input sequence. * @param __end End iterator of input sequence. * @param __comp Comparator. * @tparam __stable Sort stable. * @callgraph */ template<bool __stable, typename _RAIter, typename _Compare> inline void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, balanced_quicksort_tag __parallelism) { _GLIBCXX_CALL(__end - __begin) _GLIBCXX_PARALLEL_ASSERT(__stable == false); __parallel_sort_qsb(__begin, __end, __comp, __parallelism.__get_num_threads()); } /** * @brief Choose multiway mergesort with exact splitting, * for parallel sorting. * @param __begin Begin iterator of input sequence. * @param __end End iterator of input sequence. * @param __comp Comparator. * @tparam __stable Sort stable. * @callgraph */ template<bool __stable, typename _RAIter, typename _Compare> inline void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, default_parallel_tag __parallelism) { _GLIBCXX_CALL(__end - __begin) __parallel_sort<__stable> (__begin, __end, __comp, multiway_mergesort_exact_tag(__parallelism.__get_num_threads())); } /** * @brief Choose a parallel sorting algorithm. * @param __begin Begin iterator of input sequence. * @param __end End iterator of input sequence. * @param __comp Comparator. * @tparam __stable Sort stable. * @callgraph */ template<bool __stable, typename _RAIter, typename _Compare> inline void __parallel_sort(_RAIter __begin, _RAIter __end, _Compare __comp, parallel_tag __parallelism) { _GLIBCXX_CALL(__end - __begin) typedef std::iterator_traits<_RAIter> _TraitsType; typedef typename _TraitsType::value_type _ValueType; typedef typename _TraitsType::difference_type _DifferenceType; if (false) ; #if _GLIBCXX_MERGESORT else if (__stable || _Settings::get().sort_algorithm == MWMS) { if(_Settings::get().sort_splitting == EXACT) parallel_sort_mwms<__stable, true> (__begin, __end, __comp, __parallelism.__get_num_threads()); else parallel_sort_mwms<false, false> (__begin, __end, __comp, __parallelism.__get_num_threads()); } #endif #if _GLIBCXX_QUICKSORT else if (_Settings::get().sort_algorithm == QS) __parallel_sort_qs(__begin, __end, __comp, __parallelism.__get_num_threads()); #endif #if _GLIBCXX_BAL_QUICKSORT else if (_Settings::get().sort_algorithm == QS_BALANCED) __parallel_sort_qsb(__begin, __end, __comp, __parallelism.__get_num_threads()); #endif else __gnu_sequential::sort(__begin, __end, __comp); } } // end namespace __gnu_parallel #endif /* _GLIBCXX_PARALLEL_SORT_H */