atomicity.h revision 169692
1251652Sgjb// Low-level functions for atomic operations: Generic version -*- C++ -*- 2251652Sgjb 3251652Sgjb// Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005, 2006 4251652Sgjb// Free Software Foundation, Inc. 5251652Sgjb// 6251652Sgjb// This file is part of the GNU ISO C++ Library. This library is free 7251652Sgjb// software; you can redistribute it and/or modify it under the 8251652Sgjb// terms of the GNU General Public License as published by the 9251652Sgjb// Free Software Foundation; either version 2, or (at your option) 10262499Sgjb// any later version. 11251652Sgjb 12251652Sgjb// This library is distributed in the hope that it will be useful, 13254293Sgjb// but WITHOUT ANY WARRANTY; without even the implied warranty of 14254293Sgjb// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15254293Sgjb// GNU General Public License for more details. 16251652Sgjb 17252846Sgjb// You should have received a copy of the GNU General Public License along 18252846Sgjb// with this library; see the file COPYING. If not, write to the Free 19252846Sgjb// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20262499Sgjb// USA. 21262499Sgjb 22262499Sgjb// As a special exception, you may use this file as part of a free software 23262499Sgjb// library without restriction. Specifically, if other files instantiate 24262499Sgjb// templates or use macros or inline functions from this file, or you compile 25262499Sgjb// this file and link it with other files to produce an executable, this 26262499Sgjb// file does not by itself cause the resulting executable to be covered by 27251652Sgjb// the GNU General Public License. This exception does not however 28251652Sgjb// invalidate any other reasons why the executable file might be covered by 29251652Sgjb// the GNU General Public License. 30251652Sgjb 31252846Sgjb/** @file ext/atomicity.h 32252846Sgjb * This file is a GNU extension to the Standard C++ Library. 33251652Sgjb */ 34251652Sgjb 35251652Sgjb#include <ext/atomicity.h> 36251652Sgjb#include <ext/concurrence.h> 37251652Sgjb 38251652Sgjbnamespace 39251652Sgjb{ 40251652Sgjb __gnu_cxx::__mutex atomic_mutex; 41251652Sgjb} // anonymous namespace 42251652Sgjb 43262513Sgjb_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 44251652Sgjb 45251652Sgjb _Atomic_word 46251652Sgjb __attribute__ ((__unused__)) 47251652Sgjb __exchange_and_add(volatile _Atomic_word* __mem, int __val) 48259079Sgjb { 49264027Sgjb __gnu_cxx::__scoped_lock sentry(atomic_mutex); 50262810Sgjb _Atomic_word __result; 51262810Sgjb __result = *__mem; 52262810Sgjb *__mem += __val; 53262810Sgjb return __result; 54262810Sgjb } 55262810Sgjb 56262810Sgjb void 57262810Sgjb __attribute__ ((__unused__)) 58262810Sgjb __atomic_add(volatile _Atomic_word* __mem, int __val) 59264343Sgjb { __exchange_and_add(__mem, __val); } 60264343Sgjb 61264343Sgjb_GLIBCXX_END_NAMESPACE 62264343Sgjb