1 // -*- C++ -*- 2 3 // Copyright (C) 2007-2013 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 @a 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 _IIter, typename _UserOp, 59 typename _Functionality, typename _Red, typename _Result> 60 _UserOp 61 __for_each_template_random_access(_IIter __begin, _IIter __end, 62 _UserOp __user_op, 63 _Functionality& __functionality, 64 _Red __reduction, 65 _Result __reduction_start, 66 _Result& __output, typename 67 std::iterator_traits<_IIter>:: 68 difference_type __bound, 69 _Parallelism __parallelism_tag) 70 { 71 if (__parallelism_tag == parallel_unbalanced) 72 return __for_each_template_random_access_ed 73 (__begin, __end, __user_op, __functionality, __reduction, 74 __reduction_start, __output, __bound); 75 else if (__parallelism_tag == parallel_omp_loop) 76 return __for_each_template_random_access_omp_loop 77 (__begin, __end, __user_op, __functionality, __reduction, 78 __reduction_start, __output, __bound); 79 else if (__parallelism_tag == parallel_omp_loop_static) 80 return __for_each_template_random_access_omp_loop 81 (__begin, __end, __user_op, __functionality, __reduction, 82 __reduction_start, __output, __bound); 83 else //e. g. parallel_balanced 84 return __for_each_template_random_access_workstealing 85 (__begin, __end, __user_op, __functionality, __reduction, 86 __reduction_start, __output, __bound); 87 } 88 } 89 90 #endif /* _GLIBCXX_PARALLEL_FOR_EACH_H */ 91
