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bug#33018: 26.1.50; thread starvation with async processes and accept-pr


From: Eli Zaretskii
Subject: bug#33018: 26.1.50; thread starvation with async processes and accept-process-output
Date: Sat, 20 Oct 2018 11:34:40 +0300

> From: "Basil L. Contovounesios" <address@hidden>
> Cc: <address@hidden>,  <address@hidden>
> Date: Wed, 17 Oct 2018 21:46:39 +0100
> 
> > I think the relevant code should be instrumented to show which thread
> > waits for what process(es).
> 
> Each thread launches a single wget process which it then waits for
> before dying, and current-thread is always eq to that thread around
> calls to accept-process-output.  Or are you talking about some other
> type of thread?

I was talking about low-level details: we set up the file-descriptor
mask passed to pselect, to tell it which descriptors to wait on.  The
call to accept-process-output is supposed to arrange for the
descriptor where the corresponding process will write to be one of
those on which the corresponding pselect will wait.  I was thinking
that perhaps we become confused and don't ask pselect called by a
thread to wait on the process which was launched by that thread.

> Either way, I'll report back when I've had a deeper look into what Emacs
> is doing, unless someone beats me to it.

Thanks.

> I'm sorry I've been talking more than doing, but university and house
> hunting will dominate my free time for the next few weeks.

No need to be sorry, we all have our lives.





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