[Lazarus] Lazarus application crash. Is PostMessage thread safe?

[Giuliano Colla]

Il 10/02/2016 22:12, C Western ha scritto:
> My understanding is Application.ProcessMessages has to be reentrant 
> for the clipboard to work, at least under X, as clipboard content is 
> retrieved by receiving messages. See 
> http://bugs.freepascal.org/view.php?id=26242 for a (fixed) bug that 
> showed this up. The sequence is something along the lines of (for 
> example) ProcessMessages -> Handle paste button -> clipboard -> 
> ProcessMessages.

Well, in general it appears to behave, otherwise a lot of code would fail.
I just stumbled in a special case, when Application.ProcessMessages is 
called from within the handler of a message posted by a PostMessage from 
a different thread. It would appear that, under some circumstances 
(because the error appears randomly), there's a bug which causes it to 
pass again the same message, thus causing and endless loop. It's the 
recursion in this specific case which appears to be buggy.

Giuliano