xref: /freebsd/sbin/hastd/synch.h (revision 7aa383846770374466b1dcb2cefd71bde9acf463)
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  * $FreeBSD$
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 
40 static __inline void
41 mtx_init(pthread_mutex_t *lock)
42 {
43 	int error;
44 
45 	error = pthread_mutex_init(lock, NULL);
46 	assert(error == 0);
47 }
48 static __inline void
49 mtx_lock(pthread_mutex_t *lock)
50 {
51 	int error;
52 
53 	error = pthread_mutex_lock(lock);
54 	assert(error == 0);
55 }
56 static __inline bool
57 mtx_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 }
65 static __inline void
66 mtx_unlock(pthread_mutex_t *lock)
67 {
68 	int error;
69 
70 	error = pthread_mutex_unlock(lock);
71 	assert(error == 0);
72 }
73 
74 static __inline void
75 rw_init(pthread_rwlock_t *lock)
76 {
77 	int error;
78 
79 	error = pthread_rwlock_init(lock, NULL);
80 	assert(error == 0);
81 }
82 static __inline void
83 rw_rlock(pthread_rwlock_t *lock)
84 {
85 	int error;
86 
87 	error = pthread_rwlock_rdlock(lock);
88 	assert(error == 0);
89 }
90 static __inline void
91 rw_wlock(pthread_rwlock_t *lock)
92 {
93 	int error;
94 
95 	error = pthread_rwlock_wrlock(lock);
96 	assert(error == 0);
97 }
98 static __inline void
99 rw_unlock(pthread_rwlock_t *lock)
100 {
101 	int error;
102 
103 	error = pthread_rwlock_unlock(lock);
104 	assert(error == 0);
105 }
106 
107 static __inline void
108 cv_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 }
120 static __inline void
121 cv_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 }
128 static __inline bool
129 cv_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 }
146 static __inline void
147 cv_signal(pthread_cond_t *cv)
148 {
149 	int error;
150 
151 	error = pthread_cond_signal(cv);
152 	assert(error == 0);
153 }
154 static __inline void
155 cv_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