// Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*- // Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 2, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // You should have received a copy of the GNU General Public License along // with this library; see the file COPYING. If not, write to the Free // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, // USA. // As a special exception, you may use this file as part of a free software // library without restriction. Specifically, if other files instantiate // templates or use macros or inline functions from this file, or you compile // this file and link it with other files to produce an executable, this // file does not by itself cause the resulting executable to be covered by // the GNU General Public License. This exception does not however // invalidate any other reasons why the executable file might be covered by // the GNU General Public License. #ifndef _BITS_ATOMICITY_H #define _BITS_ATOMICITY_H 1 typedef int _Atomic_word; static inline _Atomic_word __attribute__ ((__unused__)) __exchange_and_add (volatile _Atomic_word *__mem, int __val) { register _Atomic_word __result; __asm__ __volatile__ ("lock; xaddl %0,%2" : "=r" (__result) : "0" (__val), "m" (*__mem) : "memory"); return __result; } static inline void __attribute__ ((__unused__)) __atomic_add (volatile _Atomic_word* __mem, int __val) { __asm__ __volatile__ ("lock; addl %0,%1" : : "ir" (__val), "m" (*__mem) : "memory"); } #endif /* atomicity.h */