[reactive] Re: black hole detection and concurrency

Conal Elliott conal at conal.net
Tue Jan 6 20:06:31 EST 2009

I don't know if the bug would explain <<loop>>.  My guess is that the
black-hole-detection code is incorrectly concluding there is a black hole
because a thunk was marked as in the process of being evaluated, then the
evaluating thread is killed without unmarking the thunk, and then another
thread needs the whnf.  This is a fairly naive guess.  I don't know this
machinery well enough to have confidence.

What do you think?

   - Conal

On Tue, Jan 6, 2009 at 6:27 AM, Simon Marlow <marlowsd at gmail.com> wrote:

> Conal Elliott wrote:
>> Indeed -- many thanks to Bertram, Sterling, Peter & others for the help!
>>  I think getting this bug fixed will solve Reactive's mysterious bugs and
>> unblock its progress.
> Ok, we can fix the fairly simple bug that a thread created in blocked mode
> blocks throwTos after the thread has finished.  But I'm slightly suspicious
> of the <<loop>> results you were getting - does this bug explain those too?
> Cheers,
>        Simon
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