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Diffstat (limited to 'gcc-4.4.3/libstdc++-v3/include/parallel/equally_split.h')
-rw-r--r-- | gcc-4.4.3/libstdc++-v3/include/parallel/equally_split.h | 87 |
1 files changed, 0 insertions, 87 deletions
diff --git a/gcc-4.4.3/libstdc++-v3/include/parallel/equally_split.h b/gcc-4.4.3/libstdc++-v3/include/parallel/equally_split.h deleted file mode 100644 index ee4bfeeeb..000000000 --- a/gcc-4.4.3/libstdc++-v3/include/parallel/equally_split.h +++ /dev/null @@ -1,87 +0,0 @@ -// -*- C++ -*- - -// Copyright (C) 2007, 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/equally_split.h - * This file is a GNU parallel extension to the Standard C++ Library. - */ - -// Written by Johannes Singler. - -#ifndef _GLIBCXX_PARALLEL_EQUALLY_SPLIT_H -#define _GLIBCXX_PARALLEL_EQUALLY_SPLIT_H 1 - -namespace __gnu_parallel -{ -/** @brief Function to split a sequence into parts of almost equal size. - * - * The resulting sequence s of length num_threads+1 contains the splitting - * positions when splitting the range [0,n) into parts of almost - * equal size (plus minus 1). The first entry is 0, the last one - * n. There may result empty parts. - * @param n Number of elements - * @param num_threads Number of parts - * @param s Splitters - * @returns End of splitter sequence, i. e. @c s+num_threads+1 */ -template<typename difference_type, typename OutputIterator> - OutputIterator - equally_split(difference_type n, thread_index_t num_threads, OutputIterator s) - { - difference_type chunk_length = n / num_threads; - difference_type num_longer_chunks = n % num_threads; - difference_type pos = 0; - for (thread_index_t i = 0; i < num_threads; ++i) - { - *s++ = pos; - pos += (i < num_longer_chunks) ? (chunk_length + 1) : chunk_length; - } - *s++ = n; - return s; - } - - -/** @brief Function to split a sequence into parts of almost equal size. - * - * Returns the position of the splitting point between - * thread number thread_no (included) and - * thread number thread_no+1 (excluded). - * @param n Number of elements - * @param num_threads Number of parts - * @returns _SplittingAlgorithm point */ -template<typename difference_type> - difference_type - equally_split_point(difference_type n, - thread_index_t num_threads, - thread_index_t thread_no) - { - difference_type chunk_length = n / num_threads; - difference_type num_longer_chunks = n % num_threads; - if (thread_no < num_longer_chunks) - return thread_no * (chunk_length + 1); - else - return num_longer_chunks * (chunk_length + 1) - + (thread_no - num_longer_chunks) * chunk_length; - } -} - -#endif /* _GLIBCXX_PARALLEL_EQUALLY_SPLIT_H */ |