source:
vendors/XIOS/current/extern/boost/include/boost/smart_ptr/detail/atomic_count_pthreads.hpp
@
3408
Last change on this file since 3408 was 3408, checked in by rblod, 12 years ago | |
---|---|
|
|
File size: 1.7 KB |
Rev | Line | |
---|---|---|
[3408] | 1 | #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED |
2 | #define BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED | |
3 | ||
4 | // | |
5 | // boost/detail/atomic_count_pthreads.hpp | |
6 | // | |
7 | // Copyright (c) 2001, 2002 Peter Dimov and Multi Media Ltd. | |
8 | // | |
9 | // Distributed under the Boost Software License, Version 1.0. (See | |
10 | // accompanying file LICENSE_1_0.txt or copy at | |
11 | // http://www.boost.org/LICENSE_1_0.txt) | |
12 | // | |
13 | ||
14 | #include <pthread.h> | |
15 | ||
16 | // | |
17 | // The generic pthread_mutex-based implementation sometimes leads to | |
18 | // inefficiencies. Example: a class with two atomic_count members | |
19 | // can get away with a single mutex. | |
20 | // | |
21 | // Users can detect this situation by checking BOOST_AC_USE_PTHREADS. | |
22 | // | |
23 | ||
24 | namespace boost | |
25 | { | |
26 | ||
27 | namespace detail | |
28 | { | |
29 | ||
30 | class atomic_count | |
31 | { | |
32 | private: | |
33 | ||
34 | class scoped_lock | |
35 | { | |
36 | public: | |
37 | ||
38 | scoped_lock(pthread_mutex_t & m): m_(m) | |
39 | { | |
40 | pthread_mutex_lock(&m_); | |
41 | } | |
42 | ||
43 | ~scoped_lock() | |
44 | { | |
45 | pthread_mutex_unlock(&m_); | |
46 | } | |
47 | ||
48 | private: | |
49 | ||
50 | pthread_mutex_t & m_; | |
51 | }; | |
52 | ||
53 | public: | |
54 | ||
55 | explicit atomic_count(long v): value_(v) | |
56 | { | |
57 | pthread_mutex_init(&mutex_, 0); | |
58 | } | |
59 | ||
60 | ~atomic_count() | |
61 | { | |
62 | pthread_mutex_destroy(&mutex_); | |
63 | } | |
64 | ||
65 | long operator++() | |
66 | { | |
67 | scoped_lock lock(mutex_); | |
68 | return ++value_; | |
69 | } | |
70 | ||
71 | long operator--() | |
72 | { | |
73 | scoped_lock lock(mutex_); | |
74 | return --value_; | |
75 | } | |
76 | ||
77 | operator long() const | |
78 | { | |
79 | scoped_lock lock(mutex_); | |
80 | return value_; | |
81 | } | |
82 | ||
83 | private: | |
84 | ||
85 | atomic_count(atomic_count const &); | |
86 | atomic_count & operator=(atomic_count const &); | |
87 | ||
88 | mutable pthread_mutex_t mutex_; | |
89 | long value_; | |
90 | }; | |
91 | ||
92 | } // namespace detail | |
93 | ||
94 | } // namespace boost | |
95 | ||
96 | #endif // #ifndef BOOST_SMART_PTR_DETAIL_ATOMIC_COUNT_PTHREADS_HPP_INCLUDED |
Note: See TracBrowser
for help on using the repository browser.