From: Eli Zaretskii <eliz@gnu.org>
To: "Elias Mårtenson" <lokedhs@gmail.com>
Cc: raeburn@raeburn.org, tino.calancha@gmail.com, 25247@debbugs.gnu.org
Subject: bug#25247: 26.0.50; Concurrency crashes with XLib
Date: Fri, 30 Dec 2016 20:54:25 +0200 [thread overview]
Message-ID: <83vau1s0wu.fsf@gnu.org> (raw)
In-Reply-To: <CADtN0WJgMaF8FWGVu60Moc0yjBXwbTySbCrZ+FcTM9b=Bg-5zQ@mail.gmail.com> (message from Elias Mårtenson on Fri, 30 Dec 2016 19:21:08 +0800)
> From: Elias Mårtenson <lokedhs@gmail.com>
> Date: Fri, 30 Dec 2016 19:21:08 +0800
> Cc: Tino Calancha <tino.calancha@gmail.com>, raeburn@raeburn.org, 25247@debbugs.gnu.org
>
> > Here, I'd expect to see the "z" buffer being updated at the corresponding
> > times. I.e. the message "Foo:4" should be displayed after 4 seconds. This
> > is not what I see. Instead the messages appear in batches (i.e. several
> > rows appearing at the same time).
>
> And what do the messages that appear together say in the %d part? Do
> they all show the same value?
>
> No. They show wildly different values. For example, during one test, after roughly 8 seconds, I got 7 or so
> messages with number ranging from 2 to 8.
I think the results are unexpected only because you think of the
threads as running in parallel. But they don't; only one thread runs
at any given time, the rest are stuck, either in 'pselect', waiting
for some input or time-out, or waiting for the global lock to become
available. And sleep-for yields to other threads (i.e. makes the
global lock available).
> One interesting fact is that if I replace ‘sleep-for’ with ‘sit-for’, then the updates come at exactly the expected
> time. In other words, the unpredictable behaviour where keypresses would randomly make the ‘sit-for’ expire
> doesn't happen anymore.
What keypresses did you have in mind?
next prev parent reply other threads:[~2016-12-30 18:54 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-12-22 10:20 bug#25247: 26.0.50; Concurrency crashes Tino Calancha
2016-12-22 17:28 ` Eli Zaretskii
2016-12-23 3:34 ` Tino Calancha
2016-12-23 8:34 ` Eli Zaretskii
2016-12-23 11:32 ` Tino Calancha
2016-12-23 14:14 ` Eli Zaretskii
2016-12-29 11:37 ` bug#25247: 26.0.50; Concurrency crashes with XLib Tino Calancha
2016-12-29 17:44 ` Eli Zaretskii
2016-12-30 3:13 ` Tino Calancha
2016-12-30 7:19 ` Ken Raeburn
2016-12-30 8:37 ` Eli Zaretskii
2016-12-30 9:41 ` Eli Zaretskii
2016-12-30 10:30 ` Elias Mårtenson
2016-12-30 11:05 ` Eli Zaretskii
2016-12-30 11:21 ` Elias Mårtenson
2016-12-30 18:54 ` Eli Zaretskii [this message]
2016-12-30 20:40 ` Eli Zaretskii
2016-12-31 11:05 ` Eli Zaretskii
2016-12-31 15:34 ` Elias Mårtenson
2016-12-31 15:51 ` Eli Zaretskii
2016-12-31 16:24 ` Elias Mårtenson
2016-12-31 17:18 ` Eli Zaretskii
2016-12-31 17:28 ` Elias Mårtenson
2016-12-31 18:06 ` Eli Zaretskii
2016-12-31 18:16 ` Elias Mårtenson
2016-12-31 18:29 ` Eli Zaretskii
2016-12-31 18:38 ` Eli Zaretskii
2016-12-30 13:45 ` Tino Calancha
2016-12-30 16:57 ` Eli Zaretskii
2017-01-06 0:03 ` npostavs
2017-01-06 7:48 ` Eli Zaretskii
2016-12-23 9:34 ` bug#25247: 26.0.50; Concurrency crashes Ken Raeburn
2016-12-23 10:04 ` Eli Zaretskii
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