2 * Copyright (c) 2003 David Xu <davidxu@freebsd.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 #include "namespace.h"
33 #include "un-namespace.h"
34 #include "thr_private.h"
36 LT10_COMPAT_PRIVATE(_pthread_barrier_init);
37 LT10_COMPAT_DEFAULT(pthread_barrier_init);
38 LT10_COMPAT_PRIVATE(_pthread_barrier_wait);
39 LT10_COMPAT_DEFAULT(pthread_barrier_wait);
40 LT10_COMPAT_PRIVATE(_pthread_barrier_destroy);
41 LT10_COMPAT_DEFAULT(pthread_barrier_destroy);
43 __weak_reference(_pthread_barrier_init, pthread_barrier_init);
44 __weak_reference(_pthread_barrier_wait, pthread_barrier_wait);
45 __weak_reference(_pthread_barrier_destroy, pthread_barrier_destroy);
48 _pthread_barrier_destroy(pthread_barrier_t *barrier)
50 pthread_barrier_t bar;
53 if (barrier == NULL || *barrier == NULL)
57 if (bar->b_waiters > 0)
60 ret = _pthread_mutex_destroy(&bar->b_lock);
61 ret2 = _pthread_cond_destroy(&bar->b_cond);
63 return (ret ? ret : ret2);
67 _pthread_barrier_init(pthread_barrier_t *barrier,
68 const pthread_barrierattr_t *attr, unsigned count)
70 pthread_barrier_t bar;
73 if (barrier == NULL || count <= 0)
76 bar = malloc(sizeof(struct pthread_barrier));
80 if ((ret = _pthread_mutex_init(&bar->b_lock, NULL)) != 0) {
85 if ((ret = _pthread_cond_init(&bar->b_cond, NULL)) != 0) {
86 _pthread_mutex_destroy(&bar->b_lock);
93 bar->b_generation = 0;
100 _pthread_barrier_wait(pthread_barrier_t *barrier)
103 pthread_barrier_t bar;
105 if (barrier == NULL || *barrier == NULL)
109 if ((ret = _pthread_mutex_lock(&bar->b_lock)) != 0)
112 if (++bar->b_waiters == bar->b_count) {
113 /* Current thread is lastest thread */
116 ret = _pthread_cond_broadcast(&bar->b_cond);
118 ret = PTHREAD_BARRIER_SERIAL_THREAD;
120 gen = bar->b_generation;
122 ret = _pthread_cond_wait(
123 &bar->b_cond, &bar->b_lock);
124 /* test generation to avoid bogus wakeup */
125 } while (ret == 0 && gen == bar->b_generation);
127 _pthread_mutex_unlock(&bar->b_lock);