mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-04 19:00:09 +00:00
115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/* Test barriers.
|
|
Copyright (C) 2000-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#include <pthread.h>
|
|
#include <stdio.h>
|
|
#include <error.h>
|
|
#include <assert.h>
|
|
#include <errno.h>
|
|
|
|
#define THREADS 500
|
|
#define WAITS 3
|
|
|
|
void *
|
|
dowait (void *arg)
|
|
{
|
|
pthread_barrier_t *barrier = arg;
|
|
int ret;
|
|
|
|
ret = pthread_barrier_wait (barrier);
|
|
printf ("%d ", pthread_self ());
|
|
return (void *) ret;
|
|
}
|
|
|
|
int
|
|
main (int argc, char **argv)
|
|
{
|
|
pthread_barrierattr_t attr;
|
|
pthread_barrier_t barrier;
|
|
|
|
int i, j;
|
|
error_t err;
|
|
pthread_t tid[THREADS];
|
|
|
|
int havesyncs;
|
|
|
|
err = pthread_barrierattr_init (&attr);
|
|
if (err)
|
|
error (1, err, "pthread_barrierattr_init");
|
|
|
|
err = pthread_barrierattr_getpshared (&attr, &i);
|
|
if (err)
|
|
error (1, err, "pthread_barrierattr_getpshared");
|
|
assert (i == PTHREAD_PROCESS_PRIVATE || i == PTHREAD_PROCESS_SHARED);
|
|
|
|
err = pthread_barrierattr_setpshared (&attr, PTHREAD_PROCESS_PRIVATE);
|
|
if (err)
|
|
error (1, err, "pthread_barrierattr_setpshared");
|
|
|
|
err = pthread_barrier_init (&barrier, &attr, THREADS + 1);
|
|
if (err)
|
|
error (1, err, "pthread_barrier_init");
|
|
|
|
for (j = 0; j < WAITS; j++)
|
|
{
|
|
|
|
for (i = 0; i < THREADS; i++)
|
|
{
|
|
err = pthread_create (&tid[i], 0, dowait, &barrier);
|
|
if (err)
|
|
error (1, err, "pthread_create (%d)", i);
|
|
}
|
|
|
|
printf ("Manager will now call pthread_barrier_wait.\n");
|
|
|
|
havesyncs
|
|
= pthread_barrier_wait (&barrier) == PTHREAD_BARRIER_SERIAL_THREAD
|
|
? 1 : 0;
|
|
|
|
for (i = THREADS - 1; i >= 0; i--)
|
|
{
|
|
void *ret;
|
|
err = pthread_join (tid[i], &ret);
|
|
if (err)
|
|
error (1, err, "pthread_join");
|
|
|
|
switch ((int) ret)
|
|
{
|
|
case 0:
|
|
break;
|
|
|
|
case PTHREAD_BARRIER_SERIAL_THREAD:
|
|
havesyncs++;
|
|
break;
|
|
|
|
default:
|
|
assert (!"Unknown value returned from pthread_barrier_wait.");
|
|
break;
|
|
}
|
|
}
|
|
|
|
printf ("\n");
|
|
|
|
assert (havesyncs == 1);
|
|
}
|
|
|
|
return 0;
|
|
}
|