1 // Low-level functions for atomic operations: Generic version -*- C++ -*-
3 // Copyright (C) 1999, 2001, 2002, 2003, 2004, 2005
4 // Free Software Foundation, Inc.
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)
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.
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,
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.
31 #include <bits/atomicity.h>
32 #include <bits/concurrence.h>
34 namespace __gnu_internal
36 __glibcxx_mutex_define_initialized(atomic_mutex);
37 } // namespace __gnu_internal
39 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx)
42 __attribute__ ((__unused__))
43 __exchange_and_add(volatile _Atomic_word* __mem, int __val)
45 __glibcxx_mutex_lock(__gnu_internal::atomic_mutex);
46 _Atomic_word __result;
49 __glibcxx_mutex_unlock(__gnu_internal::atomic_mutex);
54 __attribute__ ((__unused__))
55 __atomic_add(volatile _Atomic_word* __mem, int __val)
56 { __exchange_and_add(__mem, __val); }
58 _GLIBCXX_END_NAMESPACE