synch.h revision 204076 
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 204076 2010-02-18 23:16:19Z pjd $
30 */
31
32#ifndef	_SYNCH_H_
33#define	_SYNCH_H_
34
35#include <assert.h>
36#include <pthread.h>
37#include <stdbool.h>
38#include <time.h>
39
40static __inline void
41mtx_init(pthread_mutex_t *lock)
42{
43	int error;
44
45	error = pthread_mutex_init(lock, NULL);
46	assert(error == 0);
47}
48static __inline void
49mtx_lock(pthread_mutex_t *lock)
50{
51	int error;
52
53	error = pthread_mutex_lock(lock);
54	assert(error == 0);
55}
56static __inline bool
57mtx_trylock(pthread_mutex_t *lock)
58{
59	int error;
60
61	error = pthread_mutex_trylock(lock);
62	assert(error == 0 || error == EBUSY);
63	return (error == 0);
64}
65static __inline void
66mtx_unlock(pthread_mutex_t *lock)
67{
68	int error;
69
70	error = pthread_mutex_unlock(lock);
71	assert(error == 0);
72}
73
74static __inline void
75rw_init(pthread_rwlock_t *lock)
76{
77	int error;
78
79	error = pthread_rwlock_init(lock, NULL);
80	assert(error == 0);
81}
82static __inline void
83rw_rlock(pthread_rwlock_t *lock)
84{
85	int error;
86
87	error = pthread_rwlock_rdlock(lock);
88	assert(error == 0);
89}
90static __inline void
91rw_wlock(pthread_rwlock_t *lock)
92{
93	int error;
94
95	error = pthread_rwlock_wrlock(lock);
96	assert(error == 0);
97}
98static __inline void
99rw_unlock(pthread_rwlock_t *lock)
100{
101	int error;
102
103	error = pthread_rwlock_unlock(lock);
104	assert(error == 0);
105}
106
107static __inline void
108cv_init(pthread_cond_t *cv)
109{
110	pthread_condattr_t attr;
111	int error;
112
113	error = pthread_condattr_init(&attr);
114	assert(error == 0);
115	error = pthread_condattr_setclock(&attr, CLOCK_MONOTONIC);
116	assert(error == 0);
117	error = pthread_cond_init(cv, &attr);
118	assert(error == 0);
119}
120static __inline void
121cv_wait(pthread_cond_t *cv, pthread_mutex_t *lock)
122{
123	int error;
124
125	error = pthread_cond_wait(cv, lock);
126	assert(error == 0);
127}
128static __inline bool
129cv_timedwait(pthread_cond_t *cv, pthread_mutex_t *lock, int timeout)
130{
131	struct timespec ts;
132	int error;
133
134	if (timeout == 0) {
135		cv_wait(cv, lock);
136		return (false);
137	}
138
139        error = clock_gettime(CLOCK_MONOTONIC, &ts);
140	assert(error == 0);
141	ts.tv_sec += timeout;
142	error = pthread_cond_timedwait(cv, lock, &ts);
143	assert(error == 0 || error == ETIMEDOUT);
144	return (error == ETIMEDOUT);
145}
146static __inline void
147cv_signal(pthread_cond_t *cv)
148{
149	int error;
150
151	error = pthread_cond_signal(cv);
152	assert(error == 0);
153}
154static __inline void
155cv_broadcast(pthread_cond_t *cv)
156{
157	int error;
158
159	error = pthread_cond_broadcast(cv);
160	assert(error == 0);
161}
162#endif	/* !_SYNCH_H_ */
163