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QoreThreadLock.h
1 /* -*- mode: c++; indent-tabs-mode: nil -*- */
2 /*
3 QoreThreadLock.h
4
5 Qore Programming Language
6
7 Copyright (C) 2003 - 2013 David Nichols, all rights reserved
8
9 This library is free software; you can redistribute it and/or
10 modify it under the terms of the GNU Lesser General Public
11 License as published by the Free Software Foundation; either
12 version 2.1 of the License, or (at your option) any later version.
13
14 This library is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 Lesser General Public License for more details.
18
19 You should have received a copy of the GNU Lesser General Public
20 License along with this library; if not, write to the Free Software
21 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 #ifndef _QORE_QORETHREADLOCK_H
25
26 #define _QORE_QORETHREADLOCK_H
27
28 #include <pthread.h>
29
30 #include <assert.h>
31
32 #include <string.h>
33 #include <stdio.h>
34 #include <signal.h>
35 #include <stdlib.h>
36
38
41 class QoreThreadLock {
42 friend class QoreCondition;
43
44 private:
46 pthread_mutex_t ptm_lock;
47
49 DLLLOCAL QoreThreadLock& operator=(const QoreThreadLock&);
50
52 DLLLOCAL void init(const pthread_mutexattr_t *pma = 0) {
53 #ifndef NDEBUG
54 int rc =
55 #endif
56 pthread_mutex_init(&ptm_lock, pma);
57 assert(!rc);
58 }
59
60 public:
61
63 DLLLOCAL QoreThreadLock() {
64 init();
65 }
66
68 DLLLOCAL QoreThreadLock(const pthread_mutexattr_t *ma) {
69 init(ma);
70 }
71
73 DLLLOCAL ~QoreThreadLock() {
74 pthread_mutex_destroy(&ptm_lock);
75 }
76
78 DLLLOCAL QoreThreadLock(const QoreThreadLock&) {
79 init();
80 }
81
83
85 DLLLOCAL void lock() {
86 #ifndef NDEBUG
87 int rc =
88 #endif
89 pthread_mutex_lock(&ptm_lock);
90 assert(!rc);
91 }
92
94
96 DLLLOCAL void unlock() {
97 #ifndef NDEBUG
98 int rc =
99 #endif
100 pthread_mutex_unlock(&ptm_lock);
101 assert(!rc);
102 }
103
105
108 DLLLOCAL int trylock() {
109 return pthread_mutex_trylock(&ptm_lock);
110 }
111 };
112
114
123 class AutoLocker {
124 private:
126 DLLLOCAL AutoLocker(const AutoLocker&);
127
129 DLLLOCAL AutoLocker& operator=(const AutoLocker&);
130
132 DLLLOCAL void *operator new(size_t);
133
134 protected:
136 QoreThreadLock *lck;
137
138 public:
140 DLLLOCAL AutoLocker(QoreThreadLock *l) : lck(l) {
141 lck->lock();
142 }
143
145 DLLLOCAL AutoLocker(QoreThreadLock &l) : lck(&l) {
146 lck->lock();
147 }
148
150 DLLLOCAL ~AutoLocker() {
151 lck->unlock();
152 }
153 };
154
156
164 class AutoUnlocker {
165 private:
167 DLLLOCAL AutoUnlocker(const AutoUnlocker&);
168
170 DLLLOCAL AutoUnlocker& operator=(const AutoUnlocker&);
171
173 DLLLOCAL void *operator new(size_t);
174
175 protected:
177 QoreThreadLock *lck;
178
179 public:
181 DLLLOCAL AutoUnlocker(QoreThreadLock *l) : lck(l) {
182 if (lck)
183 lck->unlock();
184 }
185
187 DLLLOCAL AutoUnlocker(QoreThreadLock &l) : lck(&l) {
188 lck->unlock();
189 }
190
192 DLLLOCAL ~AutoUnlocker() {
193 if (lck)
194 lck->lock();
195 }
196 };
197
198
200
208 class SafeLocker {
209 private:
211 DLLLOCAL SafeLocker(const SafeLocker&);
212
214 DLLLOCAL SafeLocker& operator=(const SafeLocker&);
215
217 DLLLOCAL void *operator new(size_t);
218
219 protected:
221 QoreThreadLock *lck;
222
224 bool locked;
225
226 public:
228 DLLLOCAL SafeLocker(QoreThreadLock *l) : lck(l) {
229 lck->lock();
230 locked = true;
231 }
232
234 DLLLOCAL SafeLocker(QoreThreadLock &l) : lck(&l) {
235 lck->lock();
236 locked = true;
237 }
238
240 DLLLOCAL ~SafeLocker() {
241 if (locked)
242 lck->unlock();
243 }
244
246 DLLLOCAL void lock() {
247 assert(!locked);
248 lck->lock();
249 locked = true;
250 }
251
253 DLLLOCAL void unlock() {
254 assert(locked);
255 locked = false;
256 lck->unlock();
257 }
258
260 DLLLOCAL void stay_locked() {
261 assert(locked);
262 locked = false;
263 }
264 };
265
267
271 class OptLocker {
272 private:
274 DLLLOCAL OptLocker(const OptLocker&);
275
277 DLLLOCAL OptLocker& operator=(const OptLocker&);
278
280 DLLLOCAL void *operator new(size_t);
281
282 protected:
284 QoreThreadLock *lck;
285
286 public:
288 DLLLOCAL OptLocker(QoreThreadLock *l) : lck(l) {
289 if (lck)
290 lck->lock();
291 }
292
294 DLLLOCAL ~OptLocker() {
295 if (lck)
296 lck->unlock();
297 }
298 };
299
300 #endif // _QORE_QORETHREADLOCK_H
QoreThreadLock::~QoreThreadLock
DLLLOCAL ~QoreThreadLock()
destroys the lock
Definition: QoreThreadLock.h:73
AutoUnlocker::~AutoUnlocker
DLLLOCAL ~AutoUnlocker()
grabs the lock and destroys the object
Definition: QoreThreadLock.h:192
AutoLocker::~AutoLocker
DLLLOCAL ~AutoLocker()
destroys the object and releases the lock
Definition: QoreThreadLock.h:150
AutoLocker::AutoLocker
DLLLOCAL AutoLocker(QoreThreadLock *l)
creates the object and grabs the lock
Definition: QoreThreadLock.h:140
SafeLocker::stay_locked
DLLLOCAL void stay_locked()
will not unlock the lock when the destructor is run; do not use any other functions of this class aft...
Definition: QoreThreadLock.h:260
QoreThreadLock::QoreThreadLock
DLLLOCAL QoreThreadLock(const pthread_mutexattr_t *ma)
creates the lock with the given attributes
Definition: QoreThreadLock.h:68
QoreThreadLock::QoreThreadLock
DLLLOCAL QoreThreadLock(const QoreThreadLock &)
creates a new object (not based on the original lock status)
Definition: QoreThreadLock.h:78
AutoUnlocker::AutoUnlocker
DLLLOCAL AutoUnlocker(QoreThreadLock *l)
creates the object and releases the lock
Definition: QoreThreadLock.h:181
SafeLocker::SafeLocker
DLLLOCAL SafeLocker(QoreThreadLock &l)
creates the object and grabs the lock
Definition: QoreThreadLock.h:234
QoreThreadLock::trylock
DLLLOCAL int trylock()
attempts to acquire the mutex and returns the status immediately; does not block
Definition: QoreThreadLock.h:108
AutoLocker::AutoLocker
DLLLOCAL AutoLocker(QoreThreadLock &l)
creates the object and grabs the lock
Definition: QoreThreadLock.h:145
QoreCondition
a thread condition class implementing a wrapper for pthread_cond_t
Definition: QoreCondition.h:37
SafeLocker::unlock
DLLLOCAL void unlock()
unlocks the object and updates the locked flag, assumes that the lock is held
Definition: QoreThreadLock.h:253
AutoLocker
provides a safe and exception-safe way to hold locks in Qore, only to be used on the stack...
Definition: QoreThreadLock.h:123
OptLocker
provides a safe and exception-safe way to hold optional locks in Qore, only to be used on the stack...
Definition: QoreThreadLock.h:271
QoreThreadLock::lock
DLLLOCAL void lock()
grabs the lock (assumes that the lock is unlocked)
Definition: QoreThreadLock.h:85
AutoLocker::lck
QoreThreadLock * lck
the pointer to the lock that will be managed
Definition: QoreThreadLock.h:136
QoreThreadLock::unlock
DLLLOCAL void unlock()
releases the lock (assumes that the lock is locked)
Definition: QoreThreadLock.h:96
AutoUnlocker::AutoUnlocker
DLLLOCAL AutoUnlocker(QoreThreadLock &l)
creates the object and releases the lock
Definition: QoreThreadLock.h:187
AutoUnlocker::lck
QoreThreadLock * lck
the pointer to the lock that will be managed
Definition: QoreThreadLock.h:177
OptLocker::OptLocker
DLLLOCAL OptLocker(QoreThreadLock *l)
creates the object and grabs the lock if the argument is not NULL
Definition: QoreThreadLock.h:288
SafeLocker::~SafeLocker
DLLLOCAL ~SafeLocker()
destroys the object and unlocks the lock if it&#39;s held
Definition: QoreThreadLock.h:240
SafeLocker::locked
bool locked
flag indicating if the lock is held or not
Definition: QoreThreadLock.h:224
QoreThreadLock
provides a mutually-exclusive thread lock
Definition: QoreThreadLock.h:41
SafeLocker::SafeLocker
DLLLOCAL SafeLocker(QoreThreadLock *l)
creates the object and grabs the lock
Definition: QoreThreadLock.h:228
OptLocker::lck
QoreThreadLock * lck
the pointer to the lock that will be managed
Definition: QoreThreadLock.h:284
QoreThreadLock::QoreThreadLock
DLLLOCAL QoreThreadLock()
creates the lock
Definition: QoreThreadLock.h:63
SafeLocker::lck
QoreThreadLock * lck
the pointer to the lock that will be managed
Definition: QoreThreadLock.h:221
SafeLocker::lock
DLLLOCAL void lock()
locks the object and updates the locked flag, assumes that the lock is not already held ...
Definition: QoreThreadLock.h:246
SafeLocker
provides an exception-safe way to manage locks in Qore, only to be used on the stack, cannot be dynamically allocated
Definition: QoreThreadLock.h:208
AutoUnlocker
provides a safe and exception-safe way to release and re-acquire locks in Qore, only to be used on th...
Definition: QoreThreadLock.h:164
OptLocker::~OptLocker
DLLLOCAL ~OptLocker()
releases the lock if there is a lock pointer being managed and destroys the object ...
Definition: QoreThreadLock.h:294