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696e556ea9
2003-02-08 Ulrich Drepper <drepper@redhat.com> * tst-cond2.c: Rearrange code to not rely on behavior undefined according to POSIX. * tst-basic2.c (do_test): Lock mutex before creating the thread.
139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/* Copyright (C) 2002, 2003 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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_mutex_t syncm = PTHREAD_MUTEX_INITIALIZER;
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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: unlock sync\n", i);
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err = pthread_mutex_unlock (&syncm);
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if (err != 0)
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error (EXIT_FAILURE, err, "child %d: unlock[1] failed", i);
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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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puts ("first lock");
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err = pthread_mutex_lock (&syncm);
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if (err != 0)
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error (EXIT_FAILURE, err, "initial locking failed");
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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], NULL, 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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/* Lock and thereby wait for the child to start up and get the
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mutex for the conditional variable. */
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pthread_mutex_lock (&syncm);
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/* Unlock right away. Yes, we can use barriers but then we
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would test more functionality here. */
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pthread_mutex_unlock (&syncm);
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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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