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authorAndreas Jaeger <aj@suse.de>2000-08-22 07:35:53 +0000
committerAndreas Jaeger <aj@suse.de>2000-08-22 07:35:53 +0000
commit64f6b8f3cd1e02d26f29432bf0d077632b72f4a0 (patch)
tree979bff8f5b0f753ea75a220f3d67443238fd33ff /linuxthreads/Examples
parentdd492f9bb5495df68d442f7cabe1488e141f0620 (diff)
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* Examples/ex13.c: New test by Kurt Garloff <garloff@suse.de>.
* Makefile (tests): Add ex13. 2000-08-22 Andreas Jaeger <aj@suse.de> * Examples/ex13.c: New test by Kurt Garloff <garloff@suse.de>. * Makefile (tests): Add ex13.
Diffstat (limited to 'linuxthreads/Examples')
-rw-r--r--linuxthreads/Examples/ex13.c107
1 files changed, 107 insertions, 0 deletions
diff --git a/linuxthreads/Examples/ex13.c b/linuxthreads/Examples/ex13.c
new file mode 100644
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--- /dev/null
+++ b/linuxthreads/Examples/ex13.c
@@ -0,0 +1,107 @@
+/* Test for Pthreads/mutexes.
+ Copyright (C) 2000 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+ Contributed by Kurt Garloff <garloff@suse.de>, 2000.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#define _GNU_SOURCE 1
+
+#include <unistd.h>
+#include <stdio.h>
+#include <errno.h>
+#include <pthread.h>
+
+struct thr_ctrl
+{
+ pthread_mutex_t mutex;
+ pthread_cond_t cond;
+ int retval;
+};
+
+void
+dump_mut (pthread_mutex_t * mut)
+{
+ int i;
+
+ for (i = 0; i < sizeof (*mut); i++)
+ printf (" %02x", *((unsigned char *) mut + i));
+ printf ("\n");
+};
+
+/* Helper, the opposite of pthread_cond_wait (cond, mut). */
+void
+pthr_cond_signal_mutex (pthread_cond_t * cond, pthread_mutex_t * mut)
+{
+ int err;
+ if (err = pthread_mutex_lock (mut))
+ printf ("mutex_lock : %s\n", strerror (err));
+ if (err = pthread_cond_signal (cond))
+ printf ("cond_signal : %s\n", strerror (err));
+ if (err = pthread_mutex_unlock (mut))
+ printf ("mutex_unlock: %s\n", strerror (err));
+}
+
+
+void *
+thread_start (void *ptr)
+{
+ struct thr_ctrl *tc = ptr;
+ int err;
+ /* Do initialization. */
+ /* ... */
+ /* Signal that we are ready. */
+ pthr_cond_signal_mutex (&tc->cond, &tc->mutex);
+ sleep (2);
+ pthr_cond_signal_mutex (&tc->cond, &tc->mutex);
+ tc->retval = 0;
+ pthread_exit (&tc->retval);
+}
+
+int
+main (void)
+{
+ struct thr_ctrl threadctrl;
+ pthread_t thread;
+ int err;
+ int *res = &threadctrl.retval;
+ pthread_mutexattr_t mutattr;
+ pthread_mutexattr_init (&mutattr);
+ pthread_mutex_init (&threadctrl.mutex, &mutattr);
+ pthread_cond_init (&threadctrl.cond, NULL);
+ if (err = pthread_mutex_lock (&threadctrl.mutex))
+ printf ("mutex_lock : %s\n", strerror (err));
+ dump_mut (&threadctrl.mutex);
+ pthread_create (&thread, NULL, thread_start, &threadctrl);
+ /* Wait until it's ready. */
+ if (err = pthread_cond_wait (&threadctrl.cond, &threadctrl.mutex))
+ printf ("cond_wait : %s\n", strerror (err));
+ /* Now, we should have acquired the mutex again! */
+ dump_mut (&threadctrl.mutex);
+ sleep (1);
+ dump_mut (&threadctrl.mutex);
+ if (err = pthread_cond_wait (&threadctrl.cond, &threadctrl.mutex))
+ printf ("cond_wait : %s\n", strerror (err));
+ if (err)
+ {
+ printf ("ERROR\n");
+ abort ();
+ };
+ dump_mut (&threadctrl.mutex);
+ pthread_join (thread, (void **) &res);
+ printf ("OK\n");
+ return 0;
+}