GNU bug report logs - #36609
27.0.50; Possible race-condition in threading implementation

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Package: emacs;

Reported by: Andreas Politz <politza <at> hochschule-trier.de>

Date: Thu, 11 Jul 2019 20:52:02 UTC

Severity: normal

Tags: fixed

Found in version 27.0.50

Fixed in version 28.1

Done: dick <dick.r.chiang <at> gmail.com>

Bug is archived. No further changes may be made.

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From: Andreas Schwab <schwab <at> linux-m68k.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: dick.r.chiang <at> gmail.com, 36609 <at> debbugs.gnu.org
Subject: bug#36609: 27.0.50; Possible race-condition in threading implementation
Date: Thu, 10 Jun 2021 17:35:54 +0200

On Jun 10 2021, Eli Zaretskii wrote:

> The idea is that a variable that is modified in a single machine
> instruction will always have the value assigned by the last thread
> which set that.

You cannot have that without explicit atomic operations.  An ordinary
RMW access is never atomic across cpus.

Andreas.

-- 
Andreas Schwab, schwab <at> linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."
This bug report was last modified 4 years and 27 days ago.

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