1 /*-
2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
3 *
4 * Copyright (c) 2011 Ed Schouten <[email protected]>
5 * All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 *
28 * $FreeBSD$
29 */
30
31 #include <sys/cdefs.h>
32 __FBSDID("$FreeBSD$");
33
34 #include <errno.h>
35 #include <pthread.h>
36
37 #include "threads.h"
38
39 void
mtx_destroy(mtx_t * mtx)40 mtx_destroy(mtx_t *mtx)
41 {
42
43 (void)pthread_mutex_destroy(mtx);
44 }
45
46 int
mtx_init(mtx_t * mtx,int type)47 mtx_init(mtx_t *mtx, int type)
48 {
49 pthread_mutexattr_t attr;
50 int mt;
51
52 switch (type) {
53 case mtx_plain:
54 case mtx_timed:
55 mt = PTHREAD_MUTEX_NORMAL;
56 break;
57 case mtx_plain | mtx_recursive:
58 case mtx_timed | mtx_recursive:
59 mt = PTHREAD_MUTEX_RECURSIVE;
60 break;
61 default:
62 return (thrd_error);
63 }
64
65 if (pthread_mutexattr_init(&attr) != 0)
66 return (thrd_error);
67 if (pthread_mutexattr_settype(&attr, mt) != 0)
68 return (thrd_error);
69 if (pthread_mutex_init(mtx, &attr) != 0)
70 return (thrd_error);
71 return (thrd_success);
72 }
73
74 int
mtx_lock(mtx_t * mtx)75 mtx_lock(mtx_t *mtx)
76 {
77
78 if (pthread_mutex_lock(mtx) != 0)
79 return (thrd_error);
80 return (thrd_success);
81 }
82
83 int
mtx_timedlock(mtx_t * restrict mtx,const struct timespec * restrict ts)84 mtx_timedlock(mtx_t *restrict mtx, const struct timespec *restrict ts)
85 {
86
87 switch (pthread_mutex_timedlock(mtx, ts)) {
88 case 0:
89 return (thrd_success);
90 case ETIMEDOUT:
91 return (thrd_timedout);
92 default:
93 return (thrd_error);
94 }
95 }
96
97 int
mtx_trylock(mtx_t * mtx)98 mtx_trylock(mtx_t *mtx)
99 {
100
101 switch (pthread_mutex_trylock(mtx)) {
102 case 0:
103 return (thrd_success);
104 case EBUSY:
105 return (thrd_busy);
106 default:
107 return (thrd_error);
108 }
109 }
110
111 int
mtx_unlock(mtx_t * mtx)112 mtx_unlock(mtx_t *mtx)
113 {
114
115 if (pthread_mutex_unlock(mtx) != 0)
116 return (thrd_error);
117 return (thrd_success);
118 }
119