Big Thanks to all. Now I understand what is happening ... probably I wil
use critical section to block access from thread when code in main
thread is performed ...
-Laco.
ShowModal() for a modal form will call it.
[...]
I did test in Delphi and Delphi seems also perform synchronize upon
ShowModal
Yes.
Nowhere is it stated or guaranteed that synchronisation cannot happen
in a GUI event
handler.
But cann't happen if nobody calls ProcessMessages or CheckSynchronize
explicitly.
So if user code is executed in event handler then this execution cann't
be interrupted by thread waiting for "synchronization"
Yes.
Unless you call something that does call HandleMessages/ProcessMessages
or CheckSynchronize.
Any code at any time can call the GUI message loop. A modal form is
just one instance.
ModalForm is IMO one example but may be alone in LCL ... as there are no
more controls which do same, does not ?
The dialogs like TOpenDialog and ShowMessage call it.
Another example is reading the Clipboard on gtk and retrieving files in
TShellTreeView.
Mattias
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