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[wxWidgets.git] / interface / wx / msgqueue.h

diff --git a/interface/wx/msgqueue.h b/interface/wx/msgqueue.h
index 35af235e019aa572cae16d7a64424b84dd1372bf..376625a3f068c9275beccb98064b6ff4abef50aa 100644 (file)
--- a/interface/wx/msgqueue.h
+++ b/interface/wx/msgqueue.h
@@ -1,32 +1,77 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        msgqueue.h
+// Name:        wx/msgqueue.h

 // Purpose:     interface of wxMessageQueue<T>
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
 // Purpose:     interface of wxMessageQueue<T>
 // Author:      wxWidgets team
 // RCS-ID:      $Id$

-// Licence:     wxWindows license
+// Licence:     wxWindows licence

 /////////////////////////////////////////////////////////////////////////////
 
 /**
 /////////////////////////////////////////////////////////////////////////////
 
 /**

+    Error codes for wxMessageQueue<> operations.

 
 

+    This enum contains the possible return value of wxMessageQueue<> methods.
+
+    @since 2.9.0
+    @category{threading}
+ */
+enum wxMessageQueueError
+{
+    /// Indicates that the operation completed successfully.
+    wxMSGQUEUE_NO_ERROR = 0,
+
+    /**
+        Indicates that no messages were received before timeout expired.
+
+        This return value is only used by wxMessageQueue<>::ReceiveTimeout().
+     */
+    wxMSGQUEUE_TIMEOUT,
+
+    /// Some unexpected (and fatal) error has occurred.
+    wxMSGQUEUE_MISC_ERROR
+};
+
+/**

     wxMessageQueue allows passing messages between threads.
 
     This class should be typically used to communicate between the main and worker
     wxMessageQueue allows passing messages between threads.
 
     This class should be typically used to communicate between the main and worker

-    threads. The main thread calls wxMessageQueue::Post and
-    the worker thread calls wxMessageQueue::Receive.
+    threads. The main thread calls wxMessageQueue::Post and the worker thread
+    calls wxMessageQueue::Receive.

 
 

-    For this class a message is an object of arbitrary type T. Notice that
-    often there is a some special message indicating that the thread
+    @tparam T
+        For this class a message is an object of arbitrary type T.
+
+    Notice that often there is a some special message indicating that the thread

     should terminate as there is no other way to gracefully shutdown a thread
     waiting on the message queue.
 
     should terminate as there is no other way to gracefully shutdown a thread
     waiting on the message queue.
 

+    @since 2.9.0
+

     @nolibrary
     @nolibrary

-    @category{FIXME}
+    @category{threading}

 
     @see wxThread
 */
 
     @see wxThread
 */

+template <typename T>

 class wxMessageQueue<T>
 {
 public:
 class wxMessageQueue<T>
 {
 public:

+    /**
+        Default and only constructor.
+        Use wxMessageQueue::IsOk to check if the object was successfully initialized.
+    */
+    wxMessageQueue();
+
+    /**
+        Remove all messages from the queue.
+
+        This method is meant to be called from the same thread(s) that call
+        Post() to discard any still pending requests if they became
+        unnecessary.
+
+        @since 2.9.1
+     */
+    wxMessageQueueError Clear();
+

     /**
         Returns @true if the object had been initialized successfully, @false
         if an error occurred.
     /**
         Returns @true if the object had been initialized successfully, @false
         if an error occurred.


@@ -37,32 +82,31 @@ public:
         Add a message to this queue and signal the threads waiting for messages
         (i.e. the threads which called wxMessageQueue::Receive or
         wxMessageQueue::ReceiveTimeout).
         Add a message to this queue and signal the threads waiting for messages
         (i.e. the threads which called wxMessageQueue::Receive or
         wxMessageQueue::ReceiveTimeout).

+

         This method is safe to call from multiple threads in parallel.
     */
     wxMessageQueueError Post(T const& msg);
 
     /**
         This method is safe to call from multiple threads in parallel.
     */
     wxMessageQueueError Post(T const& msg);
 
     /**

-        Block until a message becomes available in the queue. Waits indefinitely long
-        or until an error occurs.
-        The message is returned in @e msg.
+        Block until a message becomes available in the queue.
+        Waits indefinitely long or until an error occurs.
+
+        The message is returned in @a msg.

     */
     wxMessageQueueError Receive(T& msg);
 
     /**
         Block until a message becomes available in the queue, but no more than
         @a timeout milliseconds has elapsed.
     */
     wxMessageQueueError Receive(T& msg);
 
     /**
         Block until a message becomes available in the queue, but no more than
         @a timeout milliseconds has elapsed.

+

         If no message is available after @a timeout milliseconds then returns
         @b wxMSGQUEUE_TIMEOUT.
         If no message is available after @a timeout milliseconds then returns
         @b wxMSGQUEUE_TIMEOUT.

+

         If @a timeout is 0 then checks for any messages present in the queue
         and returns immediately without waiting.
         If @a timeout is 0 then checks for any messages present in the queue
         and returns immediately without waiting.

-        The message is returned in @e msg.
-    */
-    wxMessageQueueError ReceiveTimeout(long timeout, T& msg);

 
 

-    /**
-        Default and only constructor. Use wxMessageQueue::IsOk to check
-        if the object was successfully initialized.
+        The message is returned in @a msg.

     */
     */

-    wxMessageQueue();
+    wxMessageQueueError ReceiveTimeout(long timeout, T& msg);

 };
 
 };