2004-02-27 01:49:50 +01:00
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// Low-level type for atomic operations -*- C++ -*-
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// Copyright (C) 2004 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 2, or (at your option)
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// any later version.
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// You should have received a copy of the GNU General Public License along
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// with this library; see the file COPYING. If not, write to the Free
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2005-08-17 04:28:44 +02:00
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// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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2004-02-27 01:49:50 +01:00
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// USA.
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// As a special exception, you may use this file as part of a free software
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// library without restriction. Specifically, if other files instantiate
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// templates or use macros or inline functions from this file, or you compile
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// this file and link it with other files to produce an executable, this
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// file does not by itself cause the resulting executable to be covered by
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// the GNU General Public License. This exception does not however
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// invalidate any other reasons why the executable file might be covered by
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// the GNU General Public License.
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2006-12-06 00:24:07 +01:00
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/** @file atomic_word.h
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2006-11-29 21:59:22 +01:00
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* This file is a GNU extension to the Standard C++ Library.
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*/
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2004-02-27 01:49:50 +01:00
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#ifndef _GLIBCXX_ATOMIC_WORD_H
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#define _GLIBCXX_ATOMIC_WORD_H 1
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typedef int _Atomic_word;
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2004-12-28 05:36:54 +01:00
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// Define these two macros using the appropriate memory barrier for the target.
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// The commented out versions below are the defaults.
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// See ia64/atomic_word.h for an alternative approach.
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// This one prevents loads from being hoisted across the barrier;
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// in other words, this is a Load-Load acquire barrier.
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// This is necessary iff TARGET_RELAXED_ORDERING is defined in tm.h.
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// #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
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// This one prevents stores from being sunk across the barrier; in other
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// words, a Store-Store release barrier.
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// #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
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2004-02-27 01:49:50 +01:00
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#endif
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