1 | // |
---|
2 | // Mutex_POSIX.cpp |
---|
3 | // |
---|
4 | // $Id: //poco/1.3/Foundation/src/Mutex_POSIX.cpp#3 $ |
---|
5 | // |
---|
6 | // Library: Foundation |
---|
7 | // Package: Threading |
---|
8 | // Module: Mutex |
---|
9 | // |
---|
10 | // Copyright (c) 2004-2008, Applied Informatics Software Engineering GmbH. |
---|
11 | // and Contributors. |
---|
12 | // |
---|
13 | // Permission is hereby granted, free of charge, to any person or organization |
---|
14 | // obtaining a copy of the software and accompanying documentation covered by |
---|
15 | // this license (the "Software") to use, reproduce, display, distribute, |
---|
16 | // execute, and transmit the Software, and to prepare derivative works of the |
---|
17 | // Software, and to permit third-parties to whom the Software is furnished to |
---|
18 | // do so, all subject to the following: |
---|
19 | // |
---|
20 | // The copyright notices in the Software and this entire statement, including |
---|
21 | // the above license grant, this restriction and the following disclaimer, |
---|
22 | // must be included in all copies of the Software, in whole or in part, and |
---|
23 | // all derivative works of the Software, unless such copies or derivative |
---|
24 | // works are solely in the form of machine-executable object code generated by |
---|
25 | // a source language processor. |
---|
26 | // |
---|
27 | // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
---|
28 | // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
---|
29 | // FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT |
---|
30 | // SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE |
---|
31 | // FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE, |
---|
32 | // ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER |
---|
33 | // DEALINGS IN THE SOFTWARE. |
---|
34 | // |
---|
35 | |
---|
36 | |
---|
37 | #include <Poco/Mutex_POSIX.h> |
---|
38 | #include <Poco/Timestamp.h> |
---|
39 | #if !defined(POCO_NO_SYS_SELECT_H) |
---|
40 | #include <sys/select.h> |
---|
41 | #endif |
---|
42 | #include <unistd.h> |
---|
43 | #include <sys/time.h> |
---|
44 | |
---|
45 | |
---|
46 | #if defined(_POSIX_TIMEOUTS) && (_POSIX_TIMEOUTS - 200112L) >= 0L |
---|
47 | #if defined(_POSIX_THREADS) && (_POSIX_THREADS - 200112L) >= 0L |
---|
48 | #define POCO_HAVE_MUTEX_TIMEOUT |
---|
49 | #endif |
---|
50 | #endif |
---|
51 | |
---|
52 | |
---|
53 | namespace Poco { |
---|
54 | |
---|
55 | |
---|
56 | MutexImpl::MutexImpl() |
---|
57 | { |
---|
58 | pthread_mutexattr_t attr; |
---|
59 | pthread_mutexattr_init(&attr); |
---|
60 | #if defined(PTHREAD_MUTEX_RECURSIVE_NP) |
---|
61 | pthread_mutexattr_settype_np(&attr, PTHREAD_MUTEX_RECURSIVE_NP); |
---|
62 | #else |
---|
63 | pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); |
---|
64 | #endif |
---|
65 | if (pthread_mutex_init(&_mutex, &attr)) |
---|
66 | { |
---|
67 | pthread_mutexattr_destroy(&attr); |
---|
68 | throw SystemException("cannot create mutex"); |
---|
69 | } |
---|
70 | pthread_mutexattr_destroy(&attr); |
---|
71 | } |
---|
72 | |
---|
73 | |
---|
74 | MutexImpl::MutexImpl(bool fast) |
---|
75 | { |
---|
76 | pthread_mutexattr_t attr; |
---|
77 | pthread_mutexattr_init(&attr); |
---|
78 | #if defined(PTHREAD_MUTEX_RECURSIVE_NP) |
---|
79 | pthread_mutexattr_settype_np(&attr, fast ? PTHREAD_MUTEX_NORMAL_NP : PTHREAD_MUTEX_RECURSIVE_NP); |
---|
80 | #else |
---|
81 | pthread_mutexattr_settype(&attr, fast ? PTHREAD_MUTEX_NORMAL : PTHREAD_MUTEX_RECURSIVE); |
---|
82 | #endif |
---|
83 | if (pthread_mutex_init(&_mutex, &attr)) |
---|
84 | { |
---|
85 | pthread_mutexattr_destroy(&attr); |
---|
86 | throw SystemException("cannot create mutex"); |
---|
87 | } |
---|
88 | pthread_mutexattr_destroy(&attr); |
---|
89 | } |
---|
90 | |
---|
91 | |
---|
92 | MutexImpl::~MutexImpl() |
---|
93 | { |
---|
94 | pthread_mutex_destroy(&_mutex); |
---|
95 | } |
---|
96 | |
---|
97 | |
---|
98 | bool MutexImpl::tryLockImpl(long milliseconds) |
---|
99 | { |
---|
100 | #if defined(POCO_HAVE_MUTEX_TIMEOUT) |
---|
101 | struct timespec abstime; |
---|
102 | struct timeval tv; |
---|
103 | gettimeofday(&tv, NULL); |
---|
104 | abstime.tv_sec = tv.tv_sec + milliseconds / 1000; |
---|
105 | abstime.tv_nsec = tv.tv_usec*1000 + (milliseconds % 1000)*1000000; |
---|
106 | if (abstime.tv_nsec >= 1000000000) |
---|
107 | { |
---|
108 | abstime.tv_nsec -= 1000000000; |
---|
109 | abstime.tv_sec++; |
---|
110 | } |
---|
111 | int rc = pthread_mutex_timedlock(&_mutex, &abstime); |
---|
112 | if (rc == 0) |
---|
113 | return true; |
---|
114 | else if (rc == ETIMEDOUT) |
---|
115 | return false; |
---|
116 | else |
---|
117 | throw SystemException("cannot lock mutex"); |
---|
118 | #else |
---|
119 | const int sleepMillis = 5; |
---|
120 | Timestamp now; |
---|
121 | Timestamp::TimeDiff diff(Timestamp::TimeDiff(milliseconds)*1000); |
---|
122 | do |
---|
123 | { |
---|
124 | int rc = pthread_mutex_trylock(&_mutex); |
---|
125 | if (rc == 0) |
---|
126 | return true; |
---|
127 | else if (rc != EBUSY) |
---|
128 | throw SystemException("cannot lock mutex"); |
---|
129 | struct timeval tv; |
---|
130 | tv.tv_sec = 0; |
---|
131 | tv.tv_usec = sleepMillis * 1000; |
---|
132 | select(0, NULL, NULL, NULL, &tv); |
---|
133 | } |
---|
134 | while (!now.isElapsed(diff)); |
---|
135 | return false; |
---|
136 | #endif |
---|
137 | } |
---|
138 | |
---|
139 | |
---|
140 | FastMutexImpl::FastMutexImpl(): MutexImpl(true) |
---|
141 | { |
---|
142 | } |
---|
143 | |
---|
144 | |
---|
145 | FastMutexImpl::~FastMutexImpl() |
---|
146 | { |
---|
147 | } |
---|
148 | |
---|
149 | |
---|
150 | } // namespace Poco |
---|