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bug#16737: A bit of digging

From: Mike Crowe
Subject: bug#16737: A bit of digging
Date: Wed, 8 Jul 2015 21:54:13 +0100
User-agent: Mutt/1.5.23 (2014-03-12)

Thanks to Alan's reproduction recipe in message #158 I've been able to
do a bit of digging.

>From what I can determine pselect is continuously being woken up due
to activity on the X file descriptor (this can be seen in message #70)
yet pending_signals never gets set so unblock_input_to never calls
process_pending_signals so xgselect just goes round and round until
the timeout time is reached. :(

I suspected that SIGIO was left being incorrectly blocked but I
haven't been able to find any evidence for that yet.

But, I have been able to make the problem go away by recompiling
without USABLE_SIGIO defined so I'm reasonably sure that it's
something going awry in the signal area.

Perhaps this will help someone more knowledgeable than me work out
where the problem lies.


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