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95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
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/* Tests for pthread_barrier_* functions.
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Copyright (C) 2000 Free Software Foundation, Inc.
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Contributed by Kaz Kylheku <kaz@ashi.footprints.net>, 2000.
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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 not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <error.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <pthread.h>
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#define NUM_THREADS 10
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#define NUM_ITERS 500
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static void *thread (void *);
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static pthread_barrier_t barrier;
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int
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main (void)
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{
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pthread_t th;
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int i;
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if (pthread_barrier_init (&barrier, NULL, NUM_THREADS + 1) != 0)
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error (EXIT_FAILURE, 0, "cannot initialize barrier");
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for (i = 0; i < NUM_THREADS; i++)
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{
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if (pthread_create (&th, NULL, thread, NULL) != 0)
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error (EXIT_FAILURE, 0, "cannot create thread");
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}
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(void) thread (NULL);
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/* notreached */
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return 0;
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}
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static void *
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thread (void *arg)
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{
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int i;
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pthread_t self = pthread_self ();
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static pthread_t last_serial_thread;
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static int linecount; /* protected by flockfile(stdout) */
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for (i = 0; i < NUM_ITERS; i++)
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{
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switch (pthread_barrier_wait (&barrier))
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{
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case 0:
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flockfile (stdout);
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printf ("%04d: non-serial thread %lu\n", ++linecount,
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(unsigned long) self);
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funlockfile (stdout);
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break;
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case PTHREAD_BARRIER_SERIAL_THREAD:
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flockfile (stdout);
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printf ("%04d: serial thread %lu\n", ++linecount,
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(unsigned long) self);
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funlockfile (stdout);
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last_serial_thread = self;
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break;
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default:
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/* Huh? */
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error (EXIT_FAILURE, 0, "unexpected return value from barrier wait");
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}
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}
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if (pthread_equal (self, last_serial_thread))
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{
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flockfile (stdout);
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printf ("%04d: last serial thread %lu terminating process\n",
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++linecount, (unsigned long) self);
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funlockfile (stdout);
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exit (0);
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}
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pthread_exit(NULL);
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}
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