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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_MUTEX_HPP | |
28 | #define BOOST_INTERPROCESS_DETAIL_POSIX_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/exceptions.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 | #include <boost/interprocess/sync/posix/pthread_helpers.hpp> | |
48 | ||
49 | #ifndef BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
50 | # include <boost/interprocess/detail/os_thread_functions.hpp> | |
51 | # include <boost/interprocess/sync/detail/common_algorithms.hpp> | |
52 | #endif | |
53 | #include <boost/assert.hpp> | |
54 | ||
55 | namespace boost { | |
56 | namespace interprocess { | |
57 | namespace ipcdetail { | |
58 | ||
59 | class posix_condition; | |
60 | ||
61 | class posix_mutex | |
62 | { | |
63 | posix_mutex(const posix_mutex &); | |
64 | posix_mutex &operator=(const posix_mutex &); | |
65 | public: | |
66 | ||
67 | posix_mutex(); | |
68 | ~posix_mutex(); | |
69 | ||
70 | void lock(); | |
71 | bool try_lock(); | |
72 | bool timed_lock(const boost::posix_time::ptime &abs_time); | |
73 | void unlock(); | |
74 | ||
75 | friend class posix_condition; | |
76 | ||
77 | private: | |
78 | pthread_mutex_t m_mut; | |
79 | }; | |
80 | ||
81 | inline posix_mutex::posix_mutex() | |
82 | { | |
83 | mutexattr_wrapper mut_attr; | |
84 | mutex_initializer mut(m_mut, mut_attr); | |
85 | mut.release(); | |
86 | } | |
87 | ||
88 | inline posix_mutex::~posix_mutex() | |
89 | { | |
90 | int res = pthread_mutex_destroy(&m_mut); | |
91 | BOOST_ASSERT(res == 0);(void)res; | |
92 | } | |
93 | ||
94 | inline void posix_mutex::lock() | |
95 | { | |
96 | if (pthread_mutex_lock(&m_mut) != 0) | |
97 | throw lock_exception(); | |
98 | } | |
99 | ||
100 | inline bool posix_mutex::try_lock() | |
101 | { | |
102 | int res = pthread_mutex_trylock(&m_mut); | |
103 | if (!(res == 0 || res == EBUSY)) | |
104 | throw lock_exception(); | |
105 | return res == 0; | |
106 | } | |
107 | ||
108 | inline bool posix_mutex::timed_lock(const boost::posix_time::ptime &abs_time) | |
109 | { | |
110 | #ifdef BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
111 | //Posix does not support infinity absolute time so handle it here | |
112 | if(abs_time == boost::posix_time::pos_infin){ | |
113 | this->lock(); | |
114 | return true; | |
115 | } | |
116 | timespec ts = ptime_to_timespec(abs_time); | |
117 | int res = pthread_mutex_timedlock(&m_mut, &ts); | |
118 | if (res != 0 && res != ETIMEDOUT) | |
119 | throw lock_exception(); | |
120 | return res == 0; | |
121 | ||
122 | #else //BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
123 | ||
124 | return ipcdetail::try_based_timed_lock(*this, abs_time); | |
125 | ||
126 | #endif //BOOST_INTERPROCESS_POSIX_TIMEOUTS | |
127 | } | |
128 | ||
129 | inline void posix_mutex::unlock() | |
130 | { | |
131 | int res = 0; | |
132 | res = pthread_mutex_unlock(&m_mut); | |
133 | (void)res; | |
134 | BOOST_ASSERT(res == 0); | |
135 | } | |
136 | ||
137 | } //namespace ipcdetail { | |
138 | } //namespace interprocess { | |
139 | } //namespace boost { | |
140 | ||
141 | #include <boost/interprocess/detail/config_end.hpp> | |
142 | ||
143 | #endif //#ifndef BOOST_INTERPROCESS_DETAIL_POSIX_MUTEX_HPP |