1 files changed, 112 insertions, 0 deletions
diff --git a/linuxthreads/Examples/ex13.c b/linuxthreads/Examples/ex13.c
new file mode 100644
index 0000000000..14add6c773
--- /dev/null
+++ b/linuxthreads/Examples/ex13.c
@@ -0,0 +1,112 @@
+/* Test for Pthreads/mutexes.
+   Copyright (C) 2000, 2001, 2002, 2003 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 Lesser General Public License as
+   published by the Free Software Foundation; either version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser 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.  */
+
+#include <errno.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+static void *thread_start (void *ptr) __attribute__ ((__noreturn__));
+
+
+struct thr_ctrl
+{
+  pthread_mutex_t mutex;
+  pthread_cond_t cond;
+  int retval;
+};
+
+static void
+dump_mut (pthread_mutex_t * mut)
+{
+  size_t 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).  */
+static void
+pthr_cond_signal_mutex (pthread_cond_t * cond, pthread_mutex_t * mut)
+{
+  int err;
+  err = pthread_mutex_lock (mut);
+  if (err)
+    printf ("mutex_lock  : %s\n", strerror (err));
+  err = pthread_cond_signal (cond);
+  if (err)
+    printf ("cond_signal : %s\n", strerror (err));
+  err = pthread_mutex_unlock (mut);
+  if (err)
+    printf ("mutex_unlock: %s\n", strerror (err));
+}
+
+static void *
+thread_start (void *ptr)
+{
+  struct thr_ctrl *tc = ptr;
+  /* 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;
+  void *res = &threadctrl.retval;
+  pthread_mutexattr_t mutattr;
+  pthread_mutexattr_init (&mutattr);
+  pthread_mutex_init (&threadctrl.mutex, &mutattr);
+  pthread_cond_init (&threadctrl.cond, NULL);
+  err = pthread_mutex_lock (&threadctrl.mutex);
+  if (err)
+    printf ("mutex_lock : %s\n", strerror (err));
+  dump_mut (&threadctrl.mutex);
+  pthread_create (&thread, NULL, thread_start, &threadctrl);
+  /* Wait until it's ready.  */
+  err = pthread_cond_wait (&threadctrl.cond, &threadctrl.mutex);
+  if (err)
+    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);
+  err = pthread_cond_wait (&threadctrl.cond, &threadctrl.mutex);
+  if (err)
+    {
+      printf ("cond_wait  : %s\n", strerror (err));
+      printf ("ERROR\n");
+      abort ();
+    };
+  dump_mut (&threadctrl.mutex);
+  pthread_join (thread, &res);
+  printf ("OK\n");
+  return 0;
+}