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163 lines
3.6 KiB
C
163 lines
3.6 KiB
C
/* Copyright (C) 2002-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <error.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
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static pthread_barrier_t bar;
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static void *
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tf (void *a)
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{
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int i = (long int) a;
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int err;
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printf ("child %d: lock\n", i);
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err = pthread_mutex_lock (&mut);
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if (err != 0)
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error (EXIT_FAILURE, err, "locking in child failed");
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printf ("child %d: sync\n", i);
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int e = pthread_barrier_wait (&bar);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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puts ("child: barrier_wait failed");
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exit (1);
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}
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printf ("child %d: wait\n", i);
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err = pthread_cond_wait (&cond, &mut);
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if (err != 0)
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error (EXIT_FAILURE, err, "child %d: failed to wait", i);
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printf ("child %d: woken up\n", i);
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err = pthread_mutex_unlock (&mut);
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if (err != 0)
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error (EXIT_FAILURE, err, "child %d: unlock[2] failed", i);
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printf ("child %d: done\n", i);
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return NULL;
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}
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#define N 10
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static int
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do_test (void)
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{
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pthread_t th[N];
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int i;
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int err;
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printf ("&cond = %p\n&mut = %p\n", &cond, &mut);
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if (pthread_barrier_init (&bar, NULL, 2) != 0)
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{
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puts ("barrier_init failed");
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exit (1);
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}
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pthread_attr_t at;
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if (pthread_attr_init (&at) != 0)
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{
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puts ("attr_init failed");
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return 1;
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}
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if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
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{
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puts ("attr_setstacksize failed");
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return 1;
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}
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for (i = 0; i < N; ++i)
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{
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printf ("create thread %d\n", i);
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err = pthread_create (&th[i], &at, tf, (void *) (long int) i);
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if (err != 0)
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error (EXIT_FAILURE, err, "cannot create thread %d", i);
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printf ("wait for child %d\n", i);
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/* Wait for the child to start up and get the mutex for the
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conditional variable. */
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int e = pthread_barrier_wait (&bar);
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if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
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{
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puts ("barrier_wait failed");
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exit (1);
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}
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}
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if (pthread_attr_destroy (&at) != 0)
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{
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puts ("attr_destroy failed");
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return 1;
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}
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puts ("get lock outselves");
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err = pthread_mutex_lock (&mut);
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if (err != 0)
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error (EXIT_FAILURE, err, "mut locking failed");
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puts ("broadcast");
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/* Wake up all threads. */
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err = pthread_cond_broadcast (&cond);
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if (err != 0)
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error (EXIT_FAILURE, err, "parent: broadcast failed");
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err = pthread_mutex_unlock (&mut);
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if (err != 0)
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error (EXIT_FAILURE, err, "mut unlocking failed");
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/* Join all threads. */
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for (i = 0; i < N; ++i)
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{
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printf ("join thread %d\n", i);
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err = pthread_join (th[i], NULL);
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if (err != 0)
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error (EXIT_FAILURE, err, "join of child %d failed", i);
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}
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puts ("done");
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return 0;
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}
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#define TEST_FUNCTION do_test ()
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#include "../test-skeleton.c"
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