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
29 #include "namespace.h"
33 #include "un-namespace.h"
34 #include "thr_private.h"
36 __weak_reference(_pthread_barrier_init, pthread_barrier_init);
37 __weak_reference(_pthread_barrier_wait, pthread_barrier_wait);
38 __weak_reference(_pthread_barrier_destroy, pthread_barrier_destroy);
41 _pthread_barrier_destroy(pthread_barrier_t *barrier)
43 pthread_barrier_t bar;
46 if (barrier == NULL || *barrier == NULL)
50 if (bar->b_waiters > 0)
53 ret = _pthread_mutex_destroy(&bar->b_lock);
54 ret2 = _pthread_cond_destroy(&bar->b_cond);
56 return (ret ? ret : ret2);
60 _pthread_barrier_init(pthread_barrier_t *barrier,
61 const pthread_barrierattr_t *attr __unused, unsigned count)
63 pthread_barrier_t bar;
66 if (barrier == NULL || count <= 0)
69 bar = malloc(sizeof(struct pthread_barrier));
73 if ((ret = _pthread_mutex_init(&bar->b_lock, NULL)) != 0) {
78 if ((ret = _pthread_cond_init(&bar->b_cond, NULL)) != 0) {
79 _pthread_mutex_destroy(&bar->b_lock);
86 bar->b_generation = 0;
93 _pthread_barrier_wait(pthread_barrier_t *barrier)
96 pthread_barrier_t bar;
98 if (barrier == NULL || *barrier == NULL)
102 if ((ret = _pthread_mutex_lock(&bar->b_lock)) != 0)
105 if (++bar->b_waiters == bar->b_count) {
106 /* Current thread is lastest thread */
109 ret = _pthread_cond_broadcast(&bar->b_cond);
111 ret = PTHREAD_BARRIER_SERIAL_THREAD;
113 gen = bar->b_generation;
115 ret = _pthread_cond_wait(
116 &bar->b_cond, &bar->b_lock);
117 /* test generation to avoid bogus wakeup */
118 } while (ret == 0 && gen == bar->b_generation);
120 _pthread_mutex_unlock(&bar->b_lock);