GNU bug report logs - #77274
[Shepherd] Competing one-shot service starter gets erroneous failure

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Message #10 received at 77274-done <at> debbugs.gnu.org (full text, mbox):

From: Ludovic Courtès <ludo <at> gnu.org>
To: 77274-done <at> debbugs.gnu.org
Subject: Re: bug#77274: [Shepherd] Competing one-shot service starter gets
 erroneous failure
Date: Wed, 26 Mar 2025 12:36:17 +0100

Ludovic Courtès <ludo <at> gnu.org> skribis:

> As of 1.0.3, when two clients start the same one-shot service, the one
> that loses the race never sees the value that was produced by the
> ‘start’ method.
>
>   herd start one-shot & herd start one-shot
>
> Here one of the ‘herd start’ processes will wrongfully fail with “failed
> to start service one-shot”.
>
> Instead, it calls ‘service-running-value’ but that always returns #f
> because the one-shot service was stopped in the meantime.  I’m referring
> to this bit of ‘start-service’:
>
>       (match (get-message reply)
>         (#f
>          ;; We lost the race: SERVICE is already running.
>          (service-running-value service))   ;<- here
>         …)

Fixed in f730106fe1cf9a3efc2f327cc5716335585ac92b.

Ludo'.

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