mirror of
https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-21 08:24:10 +01:00
114 lines
3.2 KiB
C
114 lines
3.2 KiB
C
/*-
|
|
* Copyright (c) 2003 David Xu <davidxu@freebsd.org>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#include "namespace.h"
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <pthread.h>
|
|
#include "un-namespace.h"
|
|
|
|
#include "thr_private.h"
|
|
|
|
__weak_reference(_pthread_barrier_init, pthread_barrier_init);
|
|
__weak_reference(_pthread_barrier_wait, pthread_barrier_wait);
|
|
__weak_reference(_pthread_barrier_destroy, pthread_barrier_destroy);
|
|
|
|
int
|
|
_pthread_barrier_destroy(pthread_barrier_t *barrier)
|
|
{
|
|
pthread_barrier_t bar;
|
|
|
|
if (barrier == NULL || *barrier == NULL)
|
|
return (EINVAL);
|
|
|
|
bar = *barrier;
|
|
if (bar->b_waiters > 0)
|
|
return (EBUSY);
|
|
*barrier = NULL;
|
|
free(bar);
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
_pthread_barrier_init(pthread_barrier_t *barrier,
|
|
const pthread_barrierattr_t *attr, unsigned count)
|
|
{
|
|
pthread_barrier_t bar;
|
|
|
|
(void)attr;
|
|
|
|
if (barrier == NULL || count <= 0)
|
|
return (EINVAL);
|
|
|
|
bar = malloc(sizeof(struct pthread_barrier));
|
|
if (bar == NULL)
|
|
return (ENOMEM);
|
|
|
|
_thr_umutex_init(&bar->b_lock);
|
|
_thr_ucond_init(&bar->b_cv);
|
|
bar->b_cycle = 0;
|
|
bar->b_waiters = 0;
|
|
bar->b_count = count;
|
|
*barrier = bar;
|
|
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
_pthread_barrier_wait(pthread_barrier_t *barrier)
|
|
{
|
|
struct pthread *curthread = _get_curthread();
|
|
pthread_barrier_t bar;
|
|
int64_t cycle;
|
|
int ret;
|
|
|
|
if (barrier == NULL || *barrier == NULL)
|
|
return (EINVAL);
|
|
|
|
bar = *barrier;
|
|
THR_UMUTEX_LOCK(curthread, &bar->b_lock);
|
|
if (++bar->b_waiters == bar->b_count) {
|
|
/* Current thread is lastest thread */
|
|
bar->b_waiters = 0;
|
|
bar->b_cycle++;
|
|
_thr_ucond_broadcast(&bar->b_cv);
|
|
THR_UMUTEX_UNLOCK(curthread, &bar->b_lock);
|
|
ret = PTHREAD_BARRIER_SERIAL_THREAD;
|
|
} else {
|
|
cycle = bar->b_cycle;
|
|
do {
|
|
_thr_ucond_wait(&bar->b_cv, &bar->b_lock, NULL, 0);
|
|
THR_UMUTEX_LOCK(curthread, &bar->b_lock);
|
|
/* test cycle to avoid bogus wakeup */
|
|
} while (cycle == bar->b_cycle);
|
|
THR_UMUTEX_UNLOCK(curthread, &bar->b_lock);
|
|
ret = 0;
|
|
}
|
|
return (ret);
|
|
}
|