1 files changed, 52 insertions, 0 deletions
diff --git a/examples/APG/Threads/Guards.cpp b/examples/APG/Threads/Guards.cpp
new file mode 100644
index 00000000000..75c40c98594
--- /dev/null
+++ b/examples/APG/Threads/Guards.cpp
@@ -0,0 +1,52 @@
+// $Id$
+
+#if 0
+
+// Listing 1 code/ch12
+int 
+HA_Device_Repository::update_device (int device_id)
+{
+  this->mutex_.acquire ();
+  ACE_DEBUG ((LM_DEBUG, ACE_TEXT ("(%t) Updating device %d\n"),
+              device_id));
+
+  // Allocate a new object.
+  ACE_NEW_RETURN (object, Object, -1);
+  // ...
+  // Use the object
+
+  this->mutex_.release ();
+}
+// Listing 1
+// Listing 2 code/ch12
+int 
+HA_Device_Repository::update_device (int device_id)
+{
+  // Construct a guard specifying the type of the mutex as 
+  // a template parameter and passing in the mutex to hold
+  // as a parameter.
+  ACE_Guard<ACE_Thread_Mutex> guard (this->mutex_);
+
+  // This can throw an exception that is not caught here.
+  ACE_NEW_RETURN (object, Object, -1);
+  // ..
+  // Use the object.
+  // ..
+  // Guard is destroyed, automatically releasing the lock.
+}
+// Listing 2
+// Listing 3 code/ch12
+int 
+HA_Device_Repository::update_device (int device_id)
+{
+  ACE_GUARD_RETURN (ACE_Thread_Mutex, mon, mutex_, -1);
+
+  ACE_NEW_RETURN (object, Object, -1);
+  // Use the object.
+  // ...
+}
+// Listing 3
+
+#endif /* 0 */
+int main (int, char *[])
+{ return 0; }