source: NonGTP/Boost/boost/detail/atomic_count_gcc.hpp @ 857

Revision 857, 1.4 KB checked in by igarcia, 19 years ago (diff)
Line 
1#ifndef BOOST_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED
2#define BOOST_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED
3
4//
5//  boost/detail/atomic_count_gcc.hpp
6//
7//  atomic_count for GNU libstdc++ v3
8//
9//  http://gcc.gnu.org/onlinedocs/porting/Thread-safety.html
10//
11//  Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd.
12//  Copyright (c) 2002 Lars Gullik Bjønnes <larsbj@lyx.org>
13//  Copyright 2003-2005 Peter Dimov
14//
15//  Distributed under the Boost Software License, Version 1.0. (See
16//  accompanying file LICENSE_1_0.txt or copy at
17//  http://www.boost.org/LICENSE_1_0.txt)
18//
19
20#include <bits/atomicity.h>
21
22namespace boost
23{
24
25namespace detail
26{
27
28#if defined(__GLIBCXX__) // g++ 3.4+
29
30using __gnu_cxx::__atomic_add;
31using __gnu_cxx::__exchange_and_add;
32
33#endif
34
35class atomic_count
36{
37public:
38
39    explicit atomic_count(long v) : value_(v) {}
40
41    void operator++()
42    {
43        __atomic_add(&value_, 1);
44    }
45
46    long operator--()
47    {
48        return __exchange_and_add(&value_, -1) - 1;
49    }
50
51    operator long() const
52    {
53        return __exchange_and_add(&value_, 0);
54    }
55
56private:
57
58    atomic_count(atomic_count const &);
59    atomic_count & operator=(atomic_count const &);
60
61    mutable _Atomic_word value_;
62};
63
64} // namespace detail
65
66} // namespace boost
67
68#endif // #ifndef BOOST_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED
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