xref: /freebsd/sbin/hastd/synch.h (revision 6e5f008ac4c8cdfd9f2b08b25ef80d75d284cf2e)
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 <errno.h>
37 #include <pthread.h>
38 #include <pthread_np.h>
39 #include <stdbool.h>
40 #include <time.h>
41 
42 static __inline void
43 mtx_init(pthread_mutex_t *lock)
44 {
45 	int error;
46 
47 	error = pthread_mutex_init(lock, NULL);
48 	assert(error == 0);
49 }
50 static __inline void
51 mtx_lock(pthread_mutex_t *lock)
52 {
53 	int error;
54 
55 	error = pthread_mutex_lock(lock);
56 	assert(error == 0);
57 }
58 static __inline bool
59 mtx_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 }
67 static __inline void
68 mtx_unlock(pthread_mutex_t *lock)
69 {
70 	int error;
71 
72 	error = pthread_mutex_unlock(lock);
73 	assert(error == 0);
74 }
75 static __inline bool
76 mtx_owned(pthread_mutex_t *lock)
77 {
78 
79 	return (pthread_mutex_isowned_np(lock) != 0);
80 }
81 
82 static __inline void
83 rw_init(pthread_rwlock_t *lock)
84 {
85 	int error;
86 
87 	error = pthread_rwlock_init(lock, NULL);
88 	assert(error == 0);
89 }
90 static __inline void
91 rw_rlock(pthread_rwlock_t *lock)
92 {
93 	int error;
94 
95 	error = pthread_rwlock_rdlock(lock);
96 	assert(error == 0);
97 }
98 static __inline void
99 rw_wlock(pthread_rwlock_t *lock)
100 {
101 	int error;
102 
103 	error = pthread_rwlock_wrlock(lock);
104 	assert(error == 0);
105 }
106 static __inline void
107 rw_unlock(pthread_rwlock_t *lock)
108 {
109 	int error;
110 
111 	error = pthread_rwlock_unlock(lock);
112 	assert(error == 0);
113 }
114 
115 static __inline void
116 cv_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 }
128 static __inline void
129 cv_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 }
136 static __inline bool
137 cv_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 }
154 static __inline void
155 cv_signal(pthread_cond_t *cv)
156 {
157 	int error;
158 
159 	error = pthread_cond_signal(cv);
160 	assert(error == 0);
161 }
162 static __inline void
163 cv_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