Dave Whipp wrote:
Under my junctive semantics it is. It simply calls C<open> twice, with the two states, and returns a conjunction of the resulting filehandles. Though you probably really want a *dis*junction there.
The thing that's worrying me is: what happens when one of them throws an
exception?
Then the exception propagates back to the calling context and the result junction is never created.
> Can I catch half of the junction? You mean: can you catch the exception generated by half a junction. Yes.
Do the two threads ever join?
Yes. At the point of recombining the values of the parallel calls.
Does the exception get deferred until after all the threads have completed?
I would doubt it.
If both throw an exception: what happens then?
You just get one or the other, in no defined order. (No, I'm *not* going to scare Dan by suggesting that $! ends up with a junction of the two exceptions. ;-) Damian
