1169691Skan// Low-level functions for atomic operations: Generic version -*- C++ -*- 2169691Skan 3169691Skan// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006 4169691Skan// Free Software Foundation, Inc. 5169691Skan// 6169691Skan// This file is part of the GNU ISO C++ Library. This library is free 7169691Skan// software; you can redistribute it and/or modify it under the 8169691Skan// terms of the GNU General Public License as published by the 9169691Skan// Free Software Foundation; either version 2, or (at your option) 10169691Skan// any later version. 11169691Skan 12169691Skan// This library is distributed in the hope that it will be useful, 13169691Skan// but WITHOUT ANY WARRANTY; without even the implied warranty of 14169691Skan// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15169691Skan// GNU General Public License for more details. 16169691Skan 17169691Skan// You should have received a copy of the GNU General Public License along 18169691Skan// with this library; see the file COPYING. If not, write to the Free 19169691Skan// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20169691Skan// USA. 21169691Skan 22169691Skan// As a special exception, you may use this file as part of a free software 23169691Skan// library without restriction. Specifically, if other files instantiate 24169691Skan// templates or use macros or inline functions from this file, or you compile 25169691Skan// this file and link it with other files to produce an executable, this 26169691Skan// file does not by itself cause the resulting executable to be covered by 27169691Skan// the GNU General Public License. This exception does not however 28169691Skan// invalidate any other reasons why the executable file might be covered by 29169691Skan// the GNU General Public License. 30169691Skan 31169691Skan/** @file ext/atomicity.h 32169691Skan * This file is a GNU extension to the Standard C++ Library. 33169691Skan */ 34169691Skan 35169691Skan#include <ext/atomicity.h> 36169691Skan#include <ext/concurrence.h> 37169691Skan 38169691Skannamespace 39169691Skan{ 40169691Skan __gnu_cxx::__mutex atomic_mutex; 41169691Skan} // anonymous namespace 42169691Skan 43169691Skan_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 44169691Skan 45169691Skan _Atomic_word 46169691Skan __attribute__ ((__unused__)) 47169691Skan __exchange_and_add(volatile _Atomic_word* __mem, int __val) 48169691Skan { 49169691Skan __gnu_cxx::__scoped_lock sentry(atomic_mutex); 50169691Skan _Atomic_word __result; 51169691Skan __result = *__mem; 52169691Skan *__mem += __val; 53169691Skan return __result; 54169691Skan } 55169691Skan 56169691Skan void 57169691Skan __attribute__ ((__unused__)) 58169691Skan __atomic_add(volatile _Atomic_word* __mem, int __val) 59169691Skan { __exchange_and_add(__mem, __val); } 60169691Skan 61169691Skan_GLIBCXX_END_NAMESPACE 62