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📄 algo.h(102.35 KB)
📄 algobase.h(10.88 KB)
📄 algorithm(1.35 KB)
📄 algorithmfwd.h(29.46 KB)
📄 balanced_quicksort.h(15.78 KB)
📄 base.h(12.02 KB)
📄 basic_iterator.h(1.57 KB)
📄 checkers.h(4.5 KB)
📄 compatibility.h(10.06 KB)
📄 compiletime_settings.h(2.75 KB)
📄 equally_split.h(3.12 KB)
📄 features.h(3.5 KB)
📄 find.h(13.96 KB)
📄 find_selectors.h(6.93 KB)
📄 for_each.h(3.58 KB)
📄 for_each_selectors.h(9.57 KB)
📄 iterator.h(5.15 KB)
📄 list_partition.h(5.79 KB)
📄 losertree.h(25.12 KB)
📄 merge.h(9.33 KB)
📄 multiseq_selection.h(16.31 KB)
📄 multiway_merge.h(71.04 KB)
📄 multiway_mergesort.h(15.12 KB)
📄 numeric(19.04 KB)
📄 numericfwd.h(6.77 KB)
📄 omp_loop.h(3.9 KB)
📄 omp_loop_static.h(3.94 KB)
📄 par_loop.h(4.43 KB)
📄 parallel.h(1.54 KB)
📄 partial_sum.h(6.88 KB)
📄 partition.h(14.56 KB)
📄 queue.h(4.79 KB)
📄 quicksort.h(5.78 KB)
📄 random_number.h(3.72 KB)
📄 random_shuffle.h(17.28 KB)
📄 search.h(5.47 KB)
📄 set_operations.h(14.13 KB)
📄 settings.h(10.73 KB)
📄 sort.h(7.25 KB)
📄 tags.h(5.96 KB)
📄 types.h(4.02 KB)
📄 unique_copy.h(5.67 KB)
📄 workstealing.h(9.85 KB)

Editing: omp_loop_static.h

// -*- C++ -*-

// Copyright (C) 2007, 2008, 2009 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 "process" an element with op (depends on
   *  desired functionality, e. g. for std::for_each(), ...).
   *  @param r Functor to "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 RandomAccessIterator,
	 typename Op,
	 typename Fu,
	 typename Red,
	 typename Result>
  Op
  for_each_template_random_access_omp_loop_static(RandomAccessIterator begin,
						  RandomAccessIterator end,
						  Op o, Fu& f, Red r,
						  Result base, Result& output,
						  typename std::iterator_traits
						  <RandomAccessIterator>::
						  difference_type bound)
  {
    typedef typename
      std::iterator_traits<RandomAccessIterator>::difference_type
      difference_type;

difference_type length = end - begin;
    thread_index_t num_threads =
      std::min<difference_type>(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 (thread_index_t i = 0; i < num_threads; ++i)
              thread_results[i] = Result();
          }

thread_index_t iam = omp_get_thread_num();

#       pragma omp for schedule(static, _Settings::get().workstealing_chunk_size)
        for (difference_type pos = 0; pos < length; ++pos)
          thread_results[iam] = r(thread_results[iam], f(o, begin+pos));
      } //parallel

for (thread_index_t 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 */

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