[fpc-devel] Exceptions in threads

[Mattias Gärtner]

Zitat von Vincent Snijders <vsnijders at vodafonevast.nl>:

> Florian Klaempfl schreef:
> > Mattias Gärtner schrieb:
> >> Zitat von Michael Van Canneyt <michael at freepascal.org>:
> >>
> >>> [...]
> >>> This is the problem: At which point should this be done ?
> >>>
> >>> Can you point at the statement where it should be raised in the following
> >>> code:
> >>>
> >>>  try
> >>>    ...
> >>>    DoParallel(...);
> >>>    ...
> >>>  except
> >>>  end;
> >>>
> >>> There is only 1 possible location: in a waitloop which should be after
> the
> >>> DoParralel. This loop must check for the exceptions...
> >> Not after, but at the end of DoParallel.
> >
> > What happens if more threads throw an exception?

They are ignored.
If you want to handle more than the first exception then you can put a
try..except into AMethod.

Note: The thread pool should simplify some parallelizations. It does not solve
the problems of multi threading.


> A new exception is thrown, which has a List of InnerExceptions, instead
> of just a single InnerException ;-)

... and a tree is created for recursive DoParallel calls. ;)


Mattias