atomic_word.h

00001 // Low-level type for atomic operations -*- C++ -*-
00002 
00003 // Copyright (C) 2004, 2009 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional
00017 // permissions described in the GCC Runtime Library Exception, version
00018 // 3.1, as published by the Free Software Foundation.
00019 
00020 // You should have received a copy of the GNU General Public License and
00021 // a copy of the GCC Runtime Library Exception along with this program;
00022 // see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
00023 // <http://www.gnu.org/licenses/>.
00024 
00025 #ifndef _GLIBCXX_ATOMIC_WORD_H
00026 #define _GLIBCXX_ATOMIC_WORD_H  1
00027 
00028 typedef int _Atomic_word;
00029 
00030 #define _GLIBCXX_READ_MEM_BARRIER __asm __volatile ("isync":::"memory")
00031 #ifdef __NO_LWSYNC__
00032 #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("sync":::"memory")
00033 #else
00034 #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("lwsync":::"memory")
00035 #endif
00036 
00037 #endif 

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