1// Low-level functions for atomic operations: version for CPUs providing
2// atomic builtins -*- C++ -*-
3
4// Copyright (C) 2006 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 2, 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// You should have received a copy of the GNU General Public License along
18// with this library; see the file COPYING.  If not, write to the Free
19// Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
20// USA.
21
22// As a special exception, you may use this file as part of a free software
23// library without restriction.  Specifically, if other files instantiate
24// templates or use macros or inline functions from this file, or you compile
25// this file and link it with other files to produce an executable, this
26// file does not by itself cause the resulting executable to be covered by
27// the GNU General Public License.  This exception does not however
28// invalidate any other reasons why the executable file might be covered by
29// the GNU General Public License.
30
31/** @file ext/atomicity.h
32 *  This file is a GNU extension to the Standard C++ Library.
33 */
34
35#include <bits/c++config.h>
36#include <bits/atomic_word.h>
37
38_GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
39
40  _Atomic_word
41  __attribute__ ((__unused__))
42  __exchange_and_add(volatile _Atomic_word* __mem, int __val)
43  { return __sync_fetch_and_add(__mem, __val); }
44
45  void
46  __attribute__ ((__unused__))
47  __atomic_add(volatile _Atomic_word* __mem, int __val)
48  { __sync_fetch_and_add(__mem, __val); }
49
50_GLIBCXX_END_NAMESPACE
51