omp_loop_static.h
Go to the documentation of this file.
// -*- C++ -*-
// Copyright (C) 2007-2016 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/omp_loop_static.h
* @brief Parallelization of embarrassingly parallel execution by
* means of an OpenMP for loop with static scheduling.
* This file is a GNU parallel extension to the Standard C++ Library.
*/
// Written by Felix Putze.
#ifndef _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H
#define _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H 1
#include <omp.h>
#include <parallel/settings.h>
#include <parallel/basic_iterator.h>
namespace __gnu_parallel
{
/** @brief Embarrassingly parallel algorithm for random access
* iterators, using an OpenMP for loop with static scheduling.
*
* @param __begin Begin iterator of element sequence.
* @param __end End iterator of element sequence.
* @param __o User-supplied functor (comparator, predicate, adding
* functor, ...).
* @param __f Functor to @a process an element with __op (depends on
* desired functionality, e. g. for std::for_each(), ...).
* @param __r Functor to @a add a single __result to the already processed
* __elements (depends on functionality).
* @param __base Base value for reduction.
* @param __output Pointer to position where final result is written to
* @param __bound Maximum number of elements processed (e. g. for
* std::count_n()).
* @return User-supplied functor (that may contain a part of the result).
*/
template<typename _RAIter,
typename _Op,
typename _Fu,
typename _Red,
typename _Result>
_Op
__for_each_template_random_access_omp_loop_static(_RAIter __begin,
_RAIter __end, _Op __o,
_Fu& __f, _Red __r,
_Result __base,
_Result& __output,
typename std::iterator_traits<_RAIter>::difference_type __bound)
{
typedef typename std::iterator_traits<_RAIter>::difference_type
_DifferenceType;
_DifferenceType __length = __end - __begin;
_ThreadIndex __num_threads = std::min<_DifferenceType>
(__get_max_threads(), __length);
_Result *__thread_results;
# pragma omp parallel num_threads(__num_threads)
{
# pragma omp single
{
__num_threads = omp_get_num_threads();
__thread_results = new _Result[__num_threads];
for (_ThreadIndex __i = 0; __i < __num_threads; ++__i)
__thread_results[__i] = _Result();
}
_ThreadIndex __iam = omp_get_thread_num();
#pragma omp for schedule(static, _Settings::get().workstealing_chunk_size)
for (_DifferenceType __pos = 0; __pos < __length; ++__pos)
__thread_results[__iam] = __r(__thread_results[__iam],
__f(__o, __begin+__pos));
} //parallel
for (_ThreadIndex __i = 0; __i < __num_threads; ++__i)
__output = __r(__output, __thread_results[__i]);
delete [] __thread_results;
// Points to last element processed (needed as return value for
// some algorithms like transform).
__f.finish_iterator = __begin + __length;
return __o;
}
} // end namespace
#endif /* _GLIBCXX_PARALLEL_OMP_LOOP_STATIC_H */
basic_iterator.h
Includes the original header files concerned with iterators except for stream iterators. This file is a GNU parallel extension to the Standard C++ Library.
__gnu_parallel::_ThreadIndex
uint16_t _ThreadIndex
Unsigned integer to index a thread number. The maximum thread number (for each processor) must fit in...
Definition: types.h:123
__gnu_parallel::__for_each_template_random_access_omp_loop_static
_Op __for_each_template_random_access_omp_loop_static(_RAIter __begin, _RAIter __end, _Op __o, _Fu &__f, _Red __r, _Result __base, _Result &__output, typename std::iterator_traits< _RAIter >::difference_type __bound)
Embarrassingly parallel algorithm for random access iterators, using an OpenMP for loop with static s...
Definition: omp_loop_static.h:66
settings.h
Runtime settings and tuning parameters, heuristics to decide whether to use parallelized algorithms...
__gnu_parallel
GNU parallel code for public use.
Definition: balanced_quicksort.h:61