00001 // Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*-
00002
00003 // Copyright (C) 1999, 2000, 2001 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; xaddl %0,%2"
00041 : "=r" (__result)
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; addl %0,%1"
00052 : : "ir" (__val), "m" (*__mem) : "memory");
00053 }
00054
00055 #endif /* atomicity.h */
00056
00057
1.2.15