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