comparison DEPENDENCIES/generic/include/boost/interprocess/sync/posix/recursive_mutex.hpp @ 16:2665513ce2d3

Add boost headers
author Chris Cannam
date Tue, 05 Aug 2014 11:11:38 +0100
parents
children c530137014c0
comparison
equal deleted inserted replaced
15:663ca0da4350 16:2665513ce2d3
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 #include <boost/interprocess/detail/config_begin.hpp>
31 #include <boost/interprocess/detail/workaround.hpp>
32
33 #include <pthread.h>
34 #include <errno.h>
35 #include <boost/interprocess/sync/posix/pthread_helpers.hpp>
36 #include <boost/interprocess/sync/posix/ptime_to_timespec.hpp>
37 #include <boost/interprocess/detail/posix_time_types_wrk.hpp>
38 #include <boost/interprocess/exceptions.hpp>
39 #ifndef BOOST_INTERPROCESS_POSIX_TIMEOUTS
40 # include <boost/interprocess/detail/os_thread_functions.hpp>
41 # include <boost/interprocess/sync/spin/wait.hpp>
42 #endif
43 #include <boost/assert.hpp>
44
45 namespace boost {
46 namespace interprocess {
47 namespace ipcdetail {
48
49 class posix_recursive_mutex
50 {
51 posix_recursive_mutex(const posix_recursive_mutex &);
52 posix_recursive_mutex &operator=(const posix_recursive_mutex &);
53 public:
54
55 posix_recursive_mutex();
56 ~posix_recursive_mutex();
57
58 void lock();
59 bool try_lock();
60 bool timed_lock(const boost::posix_time::ptime &abs_time);
61 void unlock();
62
63 private:
64 pthread_mutex_t m_mut;
65 };
66
67 inline posix_recursive_mutex::posix_recursive_mutex()
68 {
69 mutexattr_wrapper mut_attr(true);
70 mutex_initializer mut(m_mut, mut_attr);
71 mut.release();
72 }
73
74 inline posix_recursive_mutex::~posix_recursive_mutex()
75 {
76 int res = pthread_mutex_destroy(&m_mut);
77 BOOST_ASSERT(res == 0);(void)res;
78 }
79
80 inline void posix_recursive_mutex::lock()
81 {
82 if (pthread_mutex_lock(&m_mut) != 0)
83 throw lock_exception();
84 }
85
86 inline bool posix_recursive_mutex::try_lock()
87 {
88 int res = pthread_mutex_trylock(&m_mut);
89 if (!(res == 0 || res == EBUSY))
90 throw lock_exception();
91 return res == 0;
92 }
93
94 inline bool posix_recursive_mutex::timed_lock(const boost::posix_time::ptime &abs_time)
95 {
96 if(abs_time == boost::posix_time::pos_infin){
97 this->lock();
98 return true;
99 }
100 #ifdef BOOST_INTERPROCESS_POSIX_TIMEOUTS
101
102 timespec ts = ptime_to_timespec(abs_time);
103 int res = pthread_mutex_timedlock(&m_mut, &ts);
104 if (res != 0 && res != ETIMEDOUT)
105 throw lock_exception();
106 return res == 0;
107
108 #else //BOOST_INTERPROCESS_POSIX_TIMEOUTS
109
110 //Obtain current count and target time
111 boost::posix_time::ptime now = microsec_clock::universal_time();
112 spin_wait swait;
113 do{
114 if(this->try_lock()){
115 break;
116 }
117 now = microsec_clock::universal_time();
118
119 if(now >= abs_time){
120 return false;
121 }
122 // relinquish current time slice
123 swait.yield();
124 }while (true);
125 return true;
126
127 #endif //BOOST_INTERPROCESS_POSIX_TIMEOUTS
128 }
129
130 inline void posix_recursive_mutex::unlock()
131 {
132 int res = 0;
133 res = pthread_mutex_unlock(&m_mut);
134 BOOST_ASSERT(res == 0); (void)res;
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_RECURSIVE_MUTEX_HPP