1117397Skan// Low-level functions for atomic operations: x86, x >= 4 version -*- C++ -*- 2117397Skan 3169691Skan// Copyright (C) 1999, 2000, 2001, 2004, 2005 Free Software Foundation, Inc. 4117397Skan// 5117397Skan// This file is part of the GNU ISO C++ Library. This library is free 6117397Skan// software; you can redistribute it and/or modify it under the 7117397Skan// terms of the GNU General Public License as published by the 8117397Skan// Free Software Foundation; either version 2, or (at your option) 9117397Skan// any later version. 10117397Skan 11117397Skan// This library is distributed in the hope that it will be useful, 12117397Skan// but WITHOUT ANY WARRANTY; without even the implied warranty of 13117397Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14117397Skan// GNU General Public License for more details. 15117397Skan 16117397Skan// You should have received a copy of the GNU General Public License along 17117397Skan// with this library; see the file COPYING. If not, write to the Free 18169691Skan// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 19117397Skan// USA. 20117397Skan 21117397Skan// As a special exception, you may use this file as part of a free software 22117397Skan// library without restriction. Specifically, if other files instantiate 23117397Skan// templates or use macros or inline functions from this file, or you compile 24117397Skan// this file and link it with other files to produce an executable, this 25117397Skan// file does not by itself cause the resulting executable to be covered by 26117397Skan// the GNU General Public License. This exception does not however 27117397Skan// invalidate any other reasons why the executable file might be covered by 28117397Skan// the GNU General Public License. 29117397Skan 30169691Skan#include <ext/atomicity.h> 31117397Skan 32169691Skan_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 33169691Skan 34132720Skan _Atomic_word 35132720Skan __attribute__ ((__unused__)) 36132720Skan __exchange_and_add(volatile _Atomic_word* __mem, int __val) 37132720Skan { 38132720Skan register _Atomic_word __result; 39132720Skan __asm__ __volatile__ ("lock; xadd{l} {%0,%1|%1,%0}" 40132720Skan : "=r" (__result), "=m" (*__mem) 41132720Skan : "0" (__val), "m" (*__mem)); 42132720Skan return __result; 43132720Skan } 44132720Skan 45132720Skan void 46132720Skan __attribute__ ((__unused__)) 47132720Skan __atomic_add(volatile _Atomic_word* __mem, int __val) 48132720Skan { 49132720Skan __asm__ __volatile__ ("lock; add{l} {%1,%0|%0,%1}" 50132720Skan : "=m" (*__mem) : "ir" (__val), "m" (*__mem)); 51132720Skan } 52117397Skan 53169691Skan_GLIBCXX_END_NAMESPACE 54169691Skan 55