115 lines
2.6 KiB
C
115 lines
2.6 KiB
C
/* Test barriers.
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Copyright (C) 2000-2018 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If
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not, see <http://www.gnu.org/licenses/>. */
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#define _GNU_SOURCE
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#include <pthread.h>
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#include <stdio.h>
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#include <error.h>
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#include <assert.h>
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#include <errno.h>
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#define THREADS 500
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#define WAITS 3
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void *
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dowait (void *arg)
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{
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pthread_barrier_t *barrier = arg;
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int ret;
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ret = pthread_barrier_wait (barrier);
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printf ("%d ", pthread_self ());
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return (void *) ret;
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}
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int
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main (int argc, char **argv)
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{
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pthread_barrierattr_t attr;
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pthread_barrier_t barrier;
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int i, j;
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error_t err;
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pthread_t tid[THREADS];
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int havesyncs;
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err = pthread_barrierattr_init (&attr);
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if (err)
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error (1, err, "pthread_barrierattr_init");
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err = pthread_barrierattr_getpshared (&attr, &i);
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if (err)
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error (1, err, "pthread_barrierattr_getpshared");
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assert (i == PTHREAD_PROCESS_PRIVATE || i == PTHREAD_PROCESS_SHARED);
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err = pthread_barrierattr_setpshared (&attr, PTHREAD_PROCESS_PRIVATE);
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if (err)
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error (1, err, "pthread_barrierattr_setpshared");
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err = pthread_barrier_init (&barrier, &attr, THREADS + 1);
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if (err)
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error (1, err, "pthread_barrier_init");
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for (j = 0; j < WAITS; j++)
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{
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for (i = 0; i < THREADS; i++)
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{
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err = pthread_create (&tid[i], 0, dowait, &barrier);
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if (err)
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error (1, err, "pthread_create (%d)", i);
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}
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printf ("Manager will now call pthread_barrier_wait.\n");
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havesyncs
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= pthread_barrier_wait (&barrier) == PTHREAD_BARRIER_SERIAL_THREAD
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? 1 : 0;
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for (i = THREADS - 1; i >= 0; i--)
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{
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void *ret;
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err = pthread_join (tid[i], &ret);
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if (err)
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error (1, err, "pthread_join");
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switch ((int) ret)
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{
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case 0:
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break;
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case PTHREAD_BARRIER_SERIAL_THREAD:
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havesyncs++;
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break;
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default:
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assert (!"Unknown value returned from pthread_barrier_wait.");
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break;
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}
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}
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printf ("\n");
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assert (havesyncs == 1);
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}
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return 0;
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}
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