-/* Copyright (C) 2002 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
exit (1);
}
+ if (pthread_mutex_lock (&lock[i]) != 0)
+ {
+ puts ("mutex_lock failed");
+ exit (1);
+ }
+
if (pthread_create (&th[i], NULL, tf, (void *) i) != 0)
{
puts ("create failed");
-/* Copyright (C) 2002 Free Software Foundation, Inc.
+/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
static pthread_mutex_t mut = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
+static pthread_mutex_t syncm = PTHREAD_MUTEX_INITIALIZER;
+
static void *
tf (void *a)
int i = (long int) a;
int err;
+ printf ("child %d: lock\n", i);
+
+ err = pthread_mutex_lock (&mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "locking in child failed");
+
+ printf ("child %d: unlock sync\n", i);
+
+ err = pthread_mutex_unlock (&syncm);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "child %d: unlock[1] failed", i);
+
printf ("child %d: wait\n", i);
err = pthread_cond_wait (&cond, &mut);
err = pthread_mutex_unlock (&mut);
if (err != 0)
- error (EXIT_FAILURE, err, "child %d: unlock failed", i);
+ error (EXIT_FAILURE, err, "child %d: unlock[2] failed", i);
printf ("child %d: done\n", i);
puts ("first lock");
- err = pthread_mutex_lock (&mut);
+ err = pthread_mutex_lock (&syncm);
if (err != 0)
error (EXIT_FAILURE, err, "initial locking failed");
printf ("wait for child %d\n", i);
/* Lock and thereby wait for the child to start up and get the
- conditional variable. */
- pthread_mutex_lock (&mut);
+ mutex for the conditional variable. */
+ pthread_mutex_lock (&syncm);
+ /* Unlock right away. Yes, we can use barriers but then we
+ would test more functionality here. */
+ pthread_mutex_unlock (&syncm);
}
- puts ("final unlock");
+ puts ("get lock outselves");
- /* Unlock in preparation of the broadcast. */
- err = pthread_mutex_unlock (&mut);
+ err = pthread_mutex_lock (&mut);
if (err != 0)
- error (EXIT_FAILURE, err, "parent: unlock failed");
+ error (EXIT_FAILURE, err, "mut locking failed");
puts ("broadcast");
if (err != 0)
error (EXIT_FAILURE, err, "parent: broadcast failed");
+ err = pthread_mutex_unlock (&mut);
+ if (err != 0)
+ error (EXIT_FAILURE, err, "mut unlocking failed");
+
/* Join all threads. */
for (i = 0; i < N; ++i)
{