synch.h revision 211876 
1/*-
2 * Copyright (c) 2009-2010 The FreeBSD Foundation
3 * All rights reserved.
4 *
5 * This software was developed by Pawel Jakub Dawidek under sponsorship from
6 * the FreeBSD Foundation.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD: head/sbin/hastd/synch.h 211876 2010-08-27 13:58:38Z pjd $
30 */
31
32#ifndef	_SYNCH_H_
33#define	_SYNCH_H_
34
35#include <assert.h>
36#include <errno.h>
37#include <pthread.h>
38#include <pthread_np.h>
39#include <stdbool.h>
40#include <time.h>
41
42static __inline void
43mtx_init(pthread_mutex_t *lock)
44{
45	int error;
46
47	error = pthread_mutex_init(lock, NULL);
48	assert(error == 0);
49}
50static __inline void
51mtx_lock(pthread_mutex_t *lock)
52{
53	int error;
54
55	error = pthread_mutex_lock(lock);
56	assert(error == 0);
57}
58static __inline bool
59mtx_trylock(pthread_mutex_t *lock)
60{
61	int error;
62
63	error = pthread_mutex_trylock(lock);
64	assert(error == 0 || error == EBUSY);
65	return (error == 0);
66}
67static __inline void
68mtx_unlock(pthread_mutex_t *lock)
69{
70	int error;
71
72	error = pthread_mutex_unlock(lock);
73	assert(error == 0);
74}
75static __inline bool
76mtx_owned(pthread_mutex_t *lock)
77{
78
79	return (pthread_mutex_isowned_np(lock) != 0);
80}
81
82static __inline void
83rw_init(pthread_rwlock_t *lock)
84{
85	int error;
86
87	error = pthread_rwlock_init(lock, NULL);
88	assert(error == 0);
89}
90static __inline void
91rw_rlock(pthread_rwlock_t *lock)
92{
93	int error;
94
95	error = pthread_rwlock_rdlock(lock);
96	assert(error == 0);
97}
98static __inline void
99rw_wlock(pthread_rwlock_t *lock)
100{
101	int error;
102
103	error = pthread_rwlock_wrlock(lock);
104	assert(error == 0);
105}
106static __inline void
107rw_unlock(pthread_rwlock_t *lock)
108{
109	int error;
110
111	error = pthread_rwlock_unlock(lock);
112	assert(error == 0);
113}
114
115static __inline void
116cv_init(pthread_cond_t *cv)
117{
118	pthread_condattr_t attr;
119	int error;
120
121	error = pthread_condattr_init(&attr);
122	assert(error == 0);
123	error = pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
124	assert(error == 0);
125	error = pthread_cond_init(cv, &attr);
126	assert(error == 0);
127}
128static __inline void
129cv_wait(pthread_cond_t *cv, pthread_mutex_t *lock)
130{
131	int error;
132
133	error = pthread_cond_wait(cv, lock);
134	assert(error == 0);
135}
136static __inline bool
137cv_timedwait(pthread_cond_t *cv, pthread_mutex_t *lock, int timeout)
138{
139	struct timespec ts;
140	int error;
141
142	if (timeout == 0) {
143		cv_wait(cv, lock);
144		return (false);
145	}
146
147        error = clock_gettime(CLOCK_MONOTONIC, &ts);
148	assert(error == 0);
149	ts.tv_sec += timeout;
150	error = pthread_cond_timedwait(cv, lock, &ts);
151	assert(error == 0 || error == ETIMEDOUT);
152	return (error == ETIMEDOUT);
153}
154static __inline void
155cv_signal(pthread_cond_t *cv)
156{
157	int error;
158
159	error = pthread_cond_signal(cv);
160	assert(error == 0);
161}
162static __inline void
163cv_broadcast(pthread_cond_t *cv)
164{
165	int error;
166
167	error = pthread_cond_broadcast(cv);
168	assert(error == 0);
169}
170#endif	/* !_SYNCH_H_ */
171