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// -*- C++ -*- // Copyright (C) 2007-2013 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/tags.h * @brief Tags for compile-time selection. * This file is a GNU parallel extension to the Standard C++ Library. */ // Written by Johannes Singler and Felix Putze. #ifndef _GLIBCXX_PARALLEL_TAGS_H #define _GLIBCXX_PARALLEL_TAGS_H 1 #include <omp.h> #include <parallel/types.h> namespace __gnu_parallel { /** @brief Forces sequential execution at compile time. */ struct sequential_tag { }; /** @brief Recommends parallel execution at compile time, * optionally using a user-specified number of threads. */ struct parallel_tag { private: _ThreadIndex _M_num_threads; public: /** @brief Default constructor. Use default number of threads. */ parallel_tag() { _M_num_threads = 0; } /** @brief Default constructor. Recommend number of threads to use. * @param __num_threads Desired number of threads. */ parallel_tag(_ThreadIndex __num_threads) { _M_num_threads = __num_threads; } /** @brief Find out desired number of threads. * @return Desired number of threads. */ _ThreadIndex __get_num_threads() { if(_M_num_threads == 0) return omp_get_max_threads(); else return _M_num_threads; } /** @brief Set the desired number of threads. * @param __num_threads Desired number of threads. */ void set_num_threads(_ThreadIndex __num_threads) { _M_num_threads = __num_threads; } }; /** @brief Recommends parallel execution using the default parallel algorithm. */ struct default_parallel_tag : public parallel_tag { default_parallel_tag() { } default_parallel_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Recommends parallel execution using dynamic load-balancing at compile time. */ struct balanced_tag : public parallel_tag { }; /** @brief Recommends parallel execution using static load-balancing at compile time. */ struct unbalanced_tag : public parallel_tag { }; /** @brief Recommends parallel execution using OpenMP dynamic load-balancing at compile time. */ struct omp_loop_tag : public parallel_tag { }; /** @brief Recommends parallel execution using OpenMP static load-balancing at compile time. */ struct omp_loop_static_tag : public parallel_tag { }; /** @brief Base class for for std::find() variants. */ struct find_tag { }; /** @brief Forces parallel merging * with exact splitting, at compile time. */ struct exact_tag : public parallel_tag { exact_tag() { } exact_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Forces parallel merging * with exact splitting, at compile time. */ struct sampling_tag : public parallel_tag { sampling_tag() { } sampling_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Forces parallel sorting using multiway mergesort * at compile time. */ struct multiway_mergesort_tag : public parallel_tag { multiway_mergesort_tag() { } multiway_mergesort_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Forces parallel sorting using multiway mergesort * with exact splitting at compile time. */ struct multiway_mergesort_exact_tag : public parallel_tag { multiway_mergesort_exact_tag() { } multiway_mergesort_exact_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Forces parallel sorting using multiway mergesort * with splitting by sampling at compile time. */ struct multiway_mergesort_sampling_tag : public parallel_tag { multiway_mergesort_sampling_tag() { } multiway_mergesort_sampling_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Forces parallel sorting using unbalanced quicksort * at compile time. */ struct quicksort_tag : public parallel_tag { quicksort_tag() { } quicksort_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Forces parallel sorting using balanced quicksort * at compile time. */ struct balanced_quicksort_tag : public parallel_tag { balanced_quicksort_tag() { } balanced_quicksort_tag(_ThreadIndex __num_threads) : parallel_tag(__num_threads) { } }; /** @brief Selects the growing block size variant for std::find(). @see _GLIBCXX_FIND_GROWING_BLOCKS */ struct growing_blocks_tag : public find_tag { }; /** @brief Selects the constant block size variant for std::find(). @see _GLIBCXX_FIND_CONSTANT_SIZE_BLOCKS */ struct constant_size_blocks_tag : public find_tag { }; /** @brief Selects the equal splitting variant for std::find(). @see _GLIBCXX_FIND_EQUAL_SPLIT */ struct equal_split_tag : public find_tag { }; } #endif /* _GLIBCXX_PARALLEL_TAGS_H */