[Lazarus] Event handling example project: results for gtk2 and fpGUI

[Michael Schnell]

Some testing results with Lazarus revision 29134 and fpGUI revision as 
of 20110120:

                      GTK2               fpGUI
 From a Thread        =======            =======
   Synchronize        (*)                 OK
   PostMessage        OK                  no function
   SendMessage        (**)                no function
   Dispatch           (**)                (***)
   QueueAsyncCall     (*)                 (****)

 From a Timer
   Synchronize               impossible
   PostMessage        OK                  no function
   SendMessage        OK                  no function
   Dispatch           OK                  OK
   QueueAsyncCall     OK                  (*****)


(*) The scheduled Events only are handled in the Main Thread when GUI 
Events for the Form are handled
(**)    Forbidden but eventually works, The scheduled Events only are 
handled in the Main Thread when GUI Events for the Form are handled
(***)   Forbidden; works doe some time, then "SIGABRT"
(****)  The scheduled Events only are handled in the Main Thread when 
the worker thread is terminated
(*****)Very funny: The scheduled Events only are handled in the Main 
Thread when e.g a completely unrelated worker thread is created and then 
terminated


Hope this helps,

-Michael