[Lazarus] Message Loop paused when no interaction with mouse?

[Henry Vermaak]

On 20/04/11 11:55, Bernd wrote:
> 2011/4/20 Henry Vermaak<henry.vermaak at gmail.com>:
>
>> See here for a related issue:
>>
>> http://bugs.freepascal.org/view.php?id=13120
>>
>> You'll have to wake up the main thread after the frame (which is what your
>> timer is doing).  For gtk you can use
>> g_main_context_wakeup(g_main_context_default), for qt there is
>> QEventLoop::wakeUp().
>
> Thank you, this is what I have read a while ago but could not find
> anymore due to the wrong serch terms.
>
> But it does not seem to help :-(

Hmm, that's strange.  This works for me.  I've written a c lib that 
notifies me of usb devices getting plugged in.  The callback from the 
lib looks like this:

procedure NotifyPlug(status: cint); cdecl;
begin
   Application.QueueAsyncCall(@Form1.NotifyAsync, status);

   {$ifdef lclgtk2}
   g_main_context_wakeup(g_main_context_default);
   {$else}
   PostMessage(Form1.Handle, LM_PAINT, 0, 0);
   {$endif}
end;

Does it make a difference if you define usecthreads?  Perhaps you can 
try postmessage, too, just to rule out a bug with the QueueAsyncCall 
implementation.  Postmessage (at least on gtk) will wake up the main 
thread (make sure you define usecthreads for this, though).

Henry