Lukas Zeller pisze:
Thanks, Jonas for the quick response (again)!
On Sep 26, 2009, at 15:31 , Jonas Maebe wrote:
On 25 Sep 2009, at 18:09, Lukas Zeller wrote:
The longjmp itself works, but after this has happened once, further
exceptions crash the program. I wonder if there is some (FPC) cleanup
routine I could or should call before the longjmp that would make the
scenario work, or if there is technical evidence that it can't work
at all.
There is no "technical evidence" that it can't work at all, but you
would have to call internal RTL routines [...]
I hope I read that correctly as: "just longjump can't work and leaves a
mess behind that might explain crashes on subsequent exceptions"
[...] which are not for public use, so
a) this is not documented or supported in any way (I can't tell you
the names by heart either)
b) if you manage to figure it out, then your code can break with any
future FPC version
Yes - if it was "my code", I'd try to avoid the situation. It
unfortunately isn't, the calling environment only provides that routine
which longjmps to handle a exception situation. So making it work with
the current FPC version and risking it'll break in a future version
would be better than nothing.
Maybe there's a better solution, but what are the official options I
have in ExceptProc other than halt? If I just return from it, how does
the call flow continue? At that time the stack must be already unwound,
but how far? While I understand ExceptProc is called when a exception
falls through all the way down to a pascal main program, I can't really
imagine at what point the same happens in a pascal shared lib.
Thanks for any explanations!
Lukas
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Don't know if that help you,but check it :
http://bugs.freepascal.org/view.php?id=13518
Boguslaw
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