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1 | ////////////////////////////////////////////////////////////////////////////// |
2 | // | |
3 | // (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost | |
4 | // Software License, Version 1.0. (See accompanying file | |
5 | // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
6 | // | |
7 | // See http://www.boost.org/libs/interprocess for documentation. | |
8 | // | |
9 | ////////////////////////////////////////////////////////////////////////////// | |
10 | // | |
11 | // Parts of the pthread code come from Boost Threads code: | |
12 | // | |
13 | ////////////////////////////////////////////////////////////////////////////// | |
14 | // | |
15 | // Copyright (C) 2001-2003 | |
16 | // William E. Kempf | |
17 | // | |
18 | // Permission to use, copy, modify, distribute and sell this software | |
19 | // and its documentation for any purpose is hereby granted without fee, | |
20 | // provided that the above copyright notice appear in all copies and | |
21 | // that both that copyright notice and this permission notice appear | |
22 | // in supporting documentation. William E. Kempf makes no representations | |
23 | // about the suitability of this software for any purpose. | |
24 | // It is provided "as is" without express or implied warranty. | |
25 | ////////////////////////////////////////////////////////////////////////////// | |
26 | ||
27 | #ifndef BOOST_INTERPROCESS_DETAIL_POSIX_RECURSIVE_MUTEX_HPP | |
28 | #define BOOST_INTERPROCESS_DETAIL_POSIX_RECURSIVE_MUTEX_HPP | |
29 | ||
30 | #ifndef BOOST_CONFIG_HPP | |
31 | # include <boost/config.hpp> | |
32 | #endif | |
33 | # | |
34 | #if defined(BOOST_HAS_PRAGMA_ONCE) | |
35 | # pragma once | |
36 | #endif | |
37 | ||
38 | #include <boost/interprocess/detail/config_begin.hpp> | |
39 | #include <boost/interprocess/detail/workaround.hpp> | |
40 | ||
41 | #include <pthread.h> | |
42 | #include <errno.h> | |
43 | #include <boost/interprocess/sync/posix/pthread_helpers.hpp> | |
44 | #include <boost/interprocess/sync/posix/ptime_to_timespec.hpp> | |
45 | #include <boost/interprocess/detail/posix_time_types_wrk.hpp> | |
46 | #include <boost/interprocess/exceptions.hpp> | |
47 | #ifndef BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
48 | # include <boost/interprocess/detail/os_thread_functions.hpp> | |
49 | # include <boost/interprocess/sync/detail/common_algorithms.hpp> | |
50 | #endif | |
51 | #include <boost/assert.hpp> | |
52 | ||
53 | namespace boost { | |
54 | namespace interprocess { | |
55 | namespace ipcdetail { | |
56 | ||
57 | class posix_recursive_mutex | |
58 | { | |
59 | posix_recursive_mutex(const posix_recursive_mutex &); | |
60 | posix_recursive_mutex &operator=(const posix_recursive_mutex &); | |
61 | public: | |
62 | ||
63 | posix_recursive_mutex(); | |
64 | ~posix_recursive_mutex(); | |
65 | ||
66 | void lock(); | |
67 | bool try_lock(); | |
68 | bool timed_lock(const boost::posix_time::ptime &abs_time); | |
69 | void unlock(); | |
70 | ||
71 | private: | |
72 | pthread_mutex_t m_mut; | |
73 | }; | |
74 | ||
75 | inline posix_recursive_mutex::posix_recursive_mutex() | |
76 | { | |
77 | mutexattr_wrapper mut_attr(true); | |
78 | mutex_initializer mut(m_mut, mut_attr); | |
79 | mut.release(); | |
80 | } | |
81 | ||
82 | inline posix_recursive_mutex::~posix_recursive_mutex() | |
83 | { | |
84 | int res = pthread_mutex_destroy(&m_mut); | |
85 | BOOST_ASSERT(res == 0);(void)res; | |
86 | } | |
87 | ||
88 | inline void posix_recursive_mutex::lock() | |
89 | { | |
90 | if (pthread_mutex_lock(&m_mut) != 0) | |
91 | throw lock_exception(); | |
92 | } | |
93 | ||
94 | inline bool posix_recursive_mutex::try_lock() | |
95 | { | |
96 | int res = pthread_mutex_trylock(&m_mut); | |
97 | if (!(res == 0 || res == EBUSY)) | |
98 | throw lock_exception(); | |
99 | return res == 0; | |
100 | } | |
101 | ||
102 | inline bool posix_recursive_mutex::timed_lock(const boost::posix_time::ptime &abs_time) | |
103 | { | |
104 | #ifdef BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
105 | //Posix does not support infinity absolute time so handle it here | |
106 | if(abs_time == boost::posix_time::pos_infin){ | |
107 | this->lock(); | |
108 | return true; | |
109 | } | |
110 | ||
111 | timespec ts = ptime_to_timespec(abs_time); | |
112 | int res = pthread_mutex_timedlock(&m_mut, &ts); | |
113 | if (res != 0 && res != ETIMEDOUT) | |
114 | throw lock_exception(); | |
115 | return res == 0; | |
116 | ||
117 | #else //BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
118 | ||
119 | return ipcdetail::try_based_timed_lock(*this, abs_time); | |
120 | ||
121 | #endif //BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
122 | } | |
123 | ||
124 | inline void posix_recursive_mutex::unlock() | |
125 | { | |
126 | int res = 0; | |
127 | res = pthread_mutex_unlock(&m_mut); | |
128 | BOOST_ASSERT(res == 0); (void)res; | |
129 | } | |
130 | ||
131 | } //namespace ipcdetail { | |
132 | } //namespace interprocess { | |
133 | } //namespace boost { | |
134 | ||
135 | #include <boost/interprocess/detail/config_end.hpp> | |
136 | ||
137 | #endif //#ifndef BOOST_INTERPROCESS_DETAIL_POSIX_RECURSIVE_MUTEX_HPP |