3 // Copyright (C) 2007, 2008, 2009 Free Software Foundation, Inc.
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
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.
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.
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21 // a copy of the GCC Runtime Library Exception along with this program;
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25 /** @file parallel/for_each.h
26 * @brief Main interface for embarrassingly parallel functions.
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.
33 // Written by Felix Putze.
35 #ifndef _GLIBCXX_PARALLEL_FOR_EACH_H
36 #define _GLIBCXX_PARALLEL_FOR_EACH_H 1
38 #include <parallel/settings.h>
39 #include <parallel/par_loop.h>
40 #include <parallel/omp_loop.h>
41 #include <parallel/workstealing.h>
43 namespace __gnu_parallel
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,
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>
61 for_each_template_random_access(InputIterator begin, InputIterator end,
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)
70 if (parallelism_tag == parallel_unbalanced)
71 return for_each_template_random_access_ed(begin, end, user_op,
72 functionality, reduction,
75 else if (parallelism_tag == parallel_omp_loop)
76 return for_each_template_random_access_omp_loop(begin, end, user_op,
81 else if (parallelism_tag == parallel_omp_loop_static)
82 return for_each_template_random_access_omp_loop(begin, end, user_op,
87 else //e. g. parallel_balanced
88 return for_each_template_random_access_workstealing(begin, end,
97 #endif /* _GLIBCXX_PARALLEL_FOR_EACH_H */