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"
35 #include "thr_private.h"
37 __weak_reference(_pthread_barrier_init, pthread_barrier_init);
38 __weak_reference(_pthread_barrier_wait, pthread_barrier_wait);
39 __weak_reference(_pthread_barrier_destroy, pthread_barrier_destroy);
42 _pthread_barrier_destroy(pthread_barrier_t *barrier)
44 pthread_barrier_t bar;
46 if (barrier == NULL || *barrier == NULL)
50 if (bar->b_waiters > 0)
58 _pthread_barrier_init(pthread_barrier_t *barrier,
59 const pthread_barrierattr_t *attr, unsigned count)
61 pthread_barrier_t bar;
65 if (barrier == NULL || count <= 0)
68 bar = malloc(sizeof(struct pthread_barrier));
72 _thr_umutex_init(&bar->b_lock);
73 _thr_ucond_init(&bar->b_cv);
83 _pthread_barrier_wait(pthread_barrier_t *barrier)
85 struct pthread *curthread = _get_curthread();
86 pthread_barrier_t bar;
90 if (barrier == NULL || *barrier == NULL)
94 THR_UMUTEX_LOCK(curthread, &bar->b_lock);
95 if (++bar->b_waiters == bar->b_count) {
96 /* Current thread is lastest thread */
99 _thr_ucond_broadcast(&bar->b_cv);
100 THR_UMUTEX_UNLOCK(curthread, &bar->b_lock);
101 ret = PTHREAD_BARRIER_SERIAL_THREAD;
103 cycle = bar->b_cycle;
105 _thr_ucond_wait(&bar->b_cv, &bar->b_lock, NULL, 0);
106 THR_UMUTEX_LOCK(curthread, &bar->b_lock);
107 /* test cycle to avoid bogus wakeup */
108 } while (cycle == bar->b_cycle);
109 THR_UMUTEX_UNLOCK(curthread, &bar->b_lock);