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