source:
vendors/XIOS/current/extern/boost/include/boost/smart_ptr/detail/atomic_count_pthreads.hpp
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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 |
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