1// Low-level functions for atomic operations: version for CPUs providing 2// atomic builtins -*- C++ -*- 3 4// Copyright (C) 2006, 2009 Free Software Foundation, Inc. 5// 6// This file is part of the GNU ISO C++ Library. This library is free 7// software; you can redistribute it and/or modify it under the 8// terms of the GNU General Public License as published by the 9// Free Software Foundation; either version 3, or (at your option) 10// any later version. 11 12// This library is distributed in the hope that it will be useful, 13// but WITHOUT ANY WARRANTY; without even the implied warranty of 14// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15// GNU General Public License for more details. 16 17// Under Section 7 of GPL version 3, you are granted additional 18// permissions described in the GCC Runtime Library Exception, version 19// 3.1, as published by the Free Software Foundation. 20 21// You should have received a copy of the GNU General Public License and 22// a copy of the GCC Runtime Library Exception along with this program; 23// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24// <http://www.gnu.org/licenses/>. 25 26/** @file ext/atomicity.h 27 * This file is a GNU extension to the Standard C++ Library. 28 */ 29 30#include <bits/c++config.h> 31#include <bits/atomic_word.h> 32 33_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 34 35 _Atomic_word 36 __attribute__ ((__unused__)) 37 __exchange_and_add(volatile _Atomic_word* __mem, int __val) throw () 38 { return __sync_fetch_and_add(__mem, __val); } 39 40 void 41 __attribute__ ((__unused__)) 42 __atomic_add(volatile _Atomic_word* __mem, int __val) throw () 43 { __sync_fetch_and_add(__mem, __val); } 44 45_GLIBCXX_END_NAMESPACE 46