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c5ded9838b
* Examples/ex13.c: Include <string.h> for strerror prototype and <stdlib.h> for abort prototype.
112 lines
3.1 KiB
C
112 lines
3.1 KiB
C
/* Test for Pthreads/mutexes.
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Copyright (C) 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Kurt Garloff <garloff@suse.de>, 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 <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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struct thr_ctrl
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{
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pthread_mutex_t mutex;
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pthread_cond_t cond;
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int retval;
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};
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void
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dump_mut (pthread_mutex_t * mut)
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{
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int i;
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for (i = 0; i < sizeof (*mut); i++)
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printf (" %02x", *((unsigned char *) mut + i));
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printf ("\n");
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};
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/* Helper, the opposite of pthread_cond_wait (cond, mut). */
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void
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pthr_cond_signal_mutex (pthread_cond_t * cond, pthread_mutex_t * mut)
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{
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int err;
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err = pthread_mutex_lock (mut);
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if (err)
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printf ("mutex_lock : %s\n", strerror (err));
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err = pthread_cond_signal (cond);
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if (err)
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printf ("cond_signal : %s\n", strerror (err));
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err = pthread_mutex_unlock (mut);
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if (err)
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printf ("mutex_unlock: %s\n", strerror (err));
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}
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void *
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thread_start (void *ptr)
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{
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struct thr_ctrl *tc = ptr;
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/* Do initialization. */
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/* ... */
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/* Signal that we are ready. */
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pthr_cond_signal_mutex (&tc->cond, &tc->mutex);
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sleep (2);
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pthr_cond_signal_mutex (&tc->cond, &tc->mutex);
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tc->retval = 0;
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pthread_exit (&tc->retval);
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}
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int
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main (void)
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{
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struct thr_ctrl threadctrl;
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pthread_t thread;
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int err;
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int *res = &threadctrl.retval;
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pthread_mutexattr_t mutattr;
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pthread_mutexattr_init (&mutattr);
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pthread_mutex_init (&threadctrl.mutex, &mutattr);
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pthread_cond_init (&threadctrl.cond, NULL);
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err = pthread_mutex_lock (&threadctrl.mutex);
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if (err)
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printf ("mutex_lock : %s\n", strerror (err));
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dump_mut (&threadctrl.mutex);
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pthread_create (&thread, NULL, thread_start, &threadctrl);
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/* Wait until it's ready. */
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err = pthread_cond_wait (&threadctrl.cond, &threadctrl.mutex);
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if (err)
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printf ("cond_wait : %s\n", strerror (err));
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/* Now, we should have acquired the mutex again! */
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dump_mut (&threadctrl.mutex);
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sleep (1);
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dump_mut (&threadctrl.mutex);
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err = pthread_cond_wait (&threadctrl.cond, &threadctrl.mutex);
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if (err)
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{
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printf ("cond_wait : %s\n", strerror (err));
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printf ("ERROR\n");
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abort ();
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};
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dump_mut (&threadctrl.mutex);
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pthread_join (thread, (void **) &res);
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printf ("OK\n");
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return 0;
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}
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