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1 | #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_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. | |
b32b8144 | 12 | // Copyright (c) 2002 Lars Gullik Bjønnes <larsbj@lyx.org> |
7c673cae FG |
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 | #if __GNUC__ * 100 + __GNUC_MINOR__ >= 402 | |
21 | # include <ext/atomicity.h> | |
22 | #else | |
23 | # include <bits/atomicity.h> | |
24 | #endif | |
25 | ||
20effc67 TL |
26 | #if defined(BOOST_SP_REPORT_IMPLEMENTATION) |
27 | ||
28 | #include <boost/config/pragma_message.hpp> | |
29 | BOOST_PRAGMA_MESSAGE("Using libstdc++ atomic_count") | |
30 | ||
31 | #endif | |
32 | ||
7c673cae FG |
33 | namespace boost |
34 | { | |
35 | ||
36 | namespace detail | |
37 | { | |
38 | ||
39 | #if defined(__GLIBCXX__) // g++ 3.4+ | |
40 | ||
41 | using __gnu_cxx::__atomic_add; | |
42 | using __gnu_cxx::__exchange_and_add; | |
43 | ||
44 | #endif | |
45 | ||
46 | class atomic_count | |
47 | { | |
48 | public: | |
49 | ||
50 | explicit atomic_count( long v ) : value_( v ) {} | |
51 | ||
52 | long operator++() | |
53 | { | |
54 | return __exchange_and_add( &value_, +1 ) + 1; | |
55 | } | |
56 | ||
57 | long operator--() | |
58 | { | |
59 | return __exchange_and_add( &value_, -1 ) - 1; | |
60 | } | |
61 | ||
62 | operator long() const | |
63 | { | |
64 | return __exchange_and_add( &value_, 0 ); | |
65 | } | |
66 | ||
67 | private: | |
68 | ||
69 | atomic_count(atomic_count const &); | |
70 | atomic_count & operator=(atomic_count const &); | |
71 | ||
72 | mutable _Atomic_word value_; | |
73 | }; | |
74 | ||
75 | } // namespace detail | |
76 | ||
77 | } // namespace boost | |
78 | ||
79 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_GCC_HPP_INCLUDED |