atomicity.h

00001 // Low-level functions for atomic operations: x86, x >= 4 version  -*- C++ -*-
00002 
00003 // Copyright (C) 1999, 2000, 2001, 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, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
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 _BITS_ATOMICITY_H
00031 #define _BITS_ATOMICITY_H   1
00032 
00033 typedef int _Atomic_word;
00034 
00035 static inline _Atomic_word 
00036 __attribute__ ((__unused__))
00037 __exchange_and_add (volatile _Atomic_word *__mem, int __val)
00038 {
00039   register _Atomic_word __result;
00040   __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}"
00041             : "=r" (__result), "=m" (*__mem) 
00042                         : "0" (__val), "m"(*__mem)
00043                         : "memory");
00044   return __result;
00045 }
00046 
00047 static inline void
00048 __attribute__ ((__unused__))
00049 __atomic_add (volatile _Atomic_word* __mem, int __val)
00050 {
00051   __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}"
00052             : "=m" (*__mem)
00053             : "ir" (__val), "m"(*__mem)
00054             : "memory");
00055 }
00056 
00057 #endif /* atomicity.h */
00058 
00059 

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