libstdc++
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00001 // -*- C++ -*- 00002 00003 // Copyright (C) 2007, 2008, 2009, 2010 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the terms 00007 // of the GNU General Public License as published by the Free Software 00008 // Foundation; either version 3, or (at your option) any later 00009 // version. 00010 00011 // This library is distributed in the hope that it will be useful, but 00012 // WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00014 // General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file parallel/for_each.h 00026 * @brief Main interface for embarrassingly parallel functions. 00027 * 00028 * The explicit implementation are in other header files, like 00029 * workstealing.h, par_loop.h, omp_loop.h, and omp_loop_static.h. 00030 * This file is a GNU parallel extension to the Standard C++ Library. 00031 */ 00032 00033 // Written by Felix Putze. 00034 00035 #ifndef _GLIBCXX_PARALLEL_FOR_EACH_H 00036 #define _GLIBCXX_PARALLEL_FOR_EACH_H 1 00037 00038 #include <parallel/settings.h> 00039 #include <parallel/par_loop.h> 00040 #include <parallel/omp_loop.h> 00041 #include <parallel/workstealing.h> 00042 00043 namespace __gnu_parallel 00044 { 00045 /** @brief Chose the desired algorithm by evaluating @c __parallelism_tag. 00046 * @param __begin Begin iterator of input sequence. 00047 * @param __end End iterator of input sequence. 00048 * @param __user_op A user-specified functor (comparator, predicate, 00049 * associative operator,...) 00050 * @param __functionality functor to @a process an element with 00051 * __user_op (depends on desired functionality, e. g. accumulate, 00052 * for_each,... 00053 * @param __reduction Reduction functor. 00054 * @param __reduction_start Initial value for reduction. 00055 * @param __output Output iterator. 00056 * @param __bound Maximum number of elements processed. 00057 * @param __parallelism_tag Parallelization method */ 00058 template<typename _IIter, typename _UserOp, 00059 typename _Functionality, typename _Red, typename _Result> 00060 _UserOp 00061 __for_each_template_random_access(_IIter __begin, _IIter __end, 00062 _UserOp __user_op, 00063 _Functionality& __functionality, 00064 _Red __reduction, 00065 _Result __reduction_start, 00066 _Result& __output, typename 00067 std::iterator_traits<_IIter>:: 00068 difference_type __bound, 00069 _Parallelism __parallelism_tag) 00070 { 00071 if (__parallelism_tag == parallel_unbalanced) 00072 return __for_each_template_random_access_ed 00073 (__begin, __end, __user_op, __functionality, __reduction, 00074 __reduction_start, __output, __bound); 00075 else if (__parallelism_tag == parallel_omp_loop) 00076 return __for_each_template_random_access_omp_loop 00077 (__begin, __end, __user_op, __functionality, __reduction, 00078 __reduction_start, __output, __bound); 00079 else if (__parallelism_tag == parallel_omp_loop_static) 00080 return __for_each_template_random_access_omp_loop 00081 (__begin, __end, __user_op, __functionality, __reduction, 00082 __reduction_start, __output, __bound); 00083 else //e. g. parallel_balanced 00084 return __for_each_template_random_access_workstealing 00085 (__begin, __end, __user_op, __functionality, __reduction, 00086 __reduction_start, __output, __bound); 00087 } 00088 } 00089 00090 #endif /* _GLIBCXX_PARALLEL_FOR_EACH_H */