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 #ifdef __arch64__
00029   typedef long _Atomic_word;
00030 #else
00031   typedef int _Atomic_word;
00032 #endif
00033 
00034 #if defined(__sparc_v9__)
00035 // These are necessary under the V9 RMO model, though it is almost never
00036 // used in userspace.
00037 #define _GLIBCXX_READ_MEM_BARRIER \
00038   __asm __volatile ("membar #LoadLoad":::"memory")
00039 #define _GLIBCXX_WRITE_MEM_BARRIER \
00040   __asm __volatile ("membar #StoreStore":::"memory")
00041 
00042 #elif defined(__sparc_v8__)
00043 // This is necessary under the PSO model.
00044 #define _GLIBCXX_WRITE_MEM_BARRIER __asm __volatile ("stbar":::"memory")
00045 
00046 #endif
00047 
00048 #endif 

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