1 // -*- C++ -*- 2 3 // Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the terms 7 // of the GNU General Public License as published by the Free Software 8 // Foundation; either version 3, or (at your option) any later 9 // version. 10 11 // This library is distributed in the hope that it will be useful, but 12 // WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 // General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file parallel/for_each.h 26 * @brief Main interface for embarrassingly parallel functions. 27 * 28 * The explicit implementation are in other header files, like 29 * workstealing.h, par_loop.h, omp_loop.h, and omp_loop_static.h. 30 * This file is a GNU parallel extension to the Standard C++ Library. 31 */ 32 33 // Written by Felix Putze. 34 35 #ifndef _GLIBCXX_PARALLEL_FOR_EACH_H 36 #define _GLIBCXX_PARALLEL_FOR_EACH_H 1 37 38 #include <parallel/settings.h> 39 #include <parallel/par_loop.h> 40 #include <parallel/omp_loop.h> 41 #include <parallel/workstealing.h> 42 43 namespace __gnu_parallel 44 { 45 /** @brief Chose the desired algorithm by evaluating @c parallelism_tag. 46 * @param begin Begin iterator of input sequence. 47 * @param end End iterator of input sequence. 48 * @param user_op A user-specified functor (comparator, predicate, 49 * associative operator,...) 50 * @param functionality functor to "process" an element with 51 * user_op (depends on desired functionality, e. g. accumulate, 52 * for_each,... 53 * @param reduction Reduction functor. 54 * @param reduction_start Initial value for reduction. 55 * @param output Output iterator. 56 * @param bound Maximum number of elements processed. 57 * @param parallelism_tag Parallelization method */ 58 template<typename InputIterator, typename UserOp, 59 typename Functionality, typename Red, typename Result> 60 UserOp 61 for_each_template_random_access(InputIterator begin, InputIterator end, 62 UserOp user_op, 63 Functionality& functionality, 64 Red reduction, Result reduction_start, 65 Result& output, typename 66 std::iterator_traits<InputIterator>:: 67 difference_type bound, 68 _Parallelism parallelism_tag) 69 { 70 if (parallelism_tag == parallel_unbalanced) 71 return for_each_template_random_access_ed(begin, end, user_op, 72 functionality, reduction, 73 reduction_start, 74 output, bound); 75 else if (parallelism_tag == parallel_omp_loop) 76 return for_each_template_random_access_omp_loop(begin, end, user_op, 77 functionality, 78 reduction, 79 reduction_start, 80 output, bound); 81 else if (parallelism_tag == parallel_omp_loop_static) 82 return for_each_template_random_access_omp_loop(begin, end, user_op, 83 functionality, 84 reduction, 85 reduction_start, 86 output, bound); 87 else //e. g. parallel_balanced 88 return for_each_template_random_access_workstealing(begin, end, 89 user_op, 90 functionality, 91 reduction, 92 reduction_start, 93 output, bound); 94 } 95 } 96 97 #endif /* _GLIBCXX_PARALLEL_FOR_EACH_H */ 98
