atomic_word.h

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00001 // Low-level type for atomic operations -*- C++ -*-
00002 
00003 // Copyright (C) 2004 Free Software Foundation, Inc.
00004 //
00005 // This file is part of the GNU ISO C++ Library.  This library is free
00006 // software; you can redistribute it and/or modify it under the
00007 // terms of the GNU General Public License as published by the
00008 // Free Software Foundation; either version 2, or (at your option)
00009 // any later version.
00010 
00011 // This library is distributed in the hope that it will be useful,
00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00014 // GNU General Public License for more details.
00015 
00016 // You should have received a copy of the GNU General Public License along
00017 // with this library; see the file COPYING.  If not, write to the Free
00018 // Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
00019 // USA.
00020 
00021 // As a special exception, you may use this file as part of a free software
00022 // library without restriction.  Specifically, if other files instantiate
00023 // templates or use macros or inline functions from this file, or you compile
00024 // this file and link it with other files to produce an executable, this
00025 // file does not by itself cause the resulting executable to be covered by
00026 // the GNU General Public License.  This exception does not however
00027 // invalidate any other reasons why the executable file might be covered by
00028 // the GNU General Public License.
00029 
00030 #ifndef _GLIBCXX_ATOMIC_WORD_H
00031 #define _GLIBCXX_ATOMIC_WORD_H  1
00032 
00033 typedef int _Atomic_word;
00034 
00035 // Define these two macros using the appropriate memory barrier for the target.
00036 // The commented out versions below are the defaults.
00037 // See ia64/atomic_word.h for an alternative approach.
00038 
00039 // This one prevents loads from being hoisted across the barrier;
00040 // in other words, this is a Load-Load acquire barrier.
00041 // This is necessary iff TARGET_RELAXED_ORDERING is defined in tm.h.  
00042 // #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("":::"memory")
00043 
00044 // This one prevents stores from being sunk across the barrier; in other
00045 // words, a Store-Store release barrier.
00046 // #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("":::"memory")
00047 
00048 #endif 

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