From: Andy Wingo <wingo@pobox.com>
To: ludo@gnu.org (Ludovic Courtès)
Cc: guile-devel@gnu.org
Subject: Re: Mark procedures
Date: Mon, 20 Jun 2016 12:34:24 +0200 [thread overview]
Message-ID: <87eg7sjgi7.fsf@pobox.com> (raw)
In-Reply-To: <87ziyspp5d.fsf@pobox.com> (Andy Wingo's message of "Thu, 05 Nov 2015 14:11:10 +0100")
Picking up an old thread....
On Thu 05 Nov 2015 14:11, Andy Wingo <wingo@pobox.com> writes:
> (1) A bug related to SMOB finalization and marking that affects
> LilyPond
>
> For (1) it seems to me that we just have a bug. A SMOB mark function
> was called on an object after the finalizer. ****Note**** that having
> the finalizer called doesn't mean that the GC object was collected -- it
> just means it was collectable, perhaps in a clique of objects.
> Finalization being asynchronous with marking it's possible that a clique
> of objects was only half-finalized when a new mark procedure runs. The
> mark procedure saw an object on which free() was already called -- this
> is possible.
>
> We should fix Guile so to "null out" the SMOB typecode when the SMOB
> finalizer is called. If our mark procedure sees a SMOB that has already
> been finalized, it just returns.
AFAIU the Lilypond / Guile 2.0 bug is still there. Has anyone tried
this strategy to fix it?
Andy
next prev parent reply other threads:[~2016-06-20 10:34 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-04 10:10 Mark procedures Andy Wingo
2015-11-04 12:01 ` Stefan Israelsson Tampe
2015-11-04 17:01 ` Mark procedures, LilyPond, and backward compatibility Mark H Weaver
2015-11-05 10:16 ` Foreign object API Ludovic Courtès
2016-02-01 22:50 ` Foreign objects removed from ‘stable-2.0’ Ludovic Courtès
2015-11-05 14:46 ` Mark procedures, LilyPond, and backward compatibility Andy Wingo
2015-11-05 10:29 ` Mark procedures Ludovic Courtès
2015-11-05 13:11 ` Andy Wingo
2015-11-05 14:17 ` Ludovic Courtès
2015-11-06 12:32 ` Mark procedures and LilyPond Mark H Weaver
2015-11-06 13:50 ` Ludovic Courtès
2015-11-06 15:05 ` Stefan Monnier
2016-01-24 8:58 ` Hans Åberg
2016-06-20 10:34 ` Andy Wingo [this message]
2016-06-20 12:15 ` Mark procedures Ludovic Courtès
2021-05-18 15:46 ` Ephemerons, self-referentality in weak hashtables Christopher Lemmer Webber
2021-06-20 15:01 ` Maxime Devos
2021-06-21 17:15 ` Maxime Devos
2021-09-08 16:18 ` Christine Lemmer-Webber
2021-09-08 20:11 ` Maxime Devos
2021-09-08 20:50 ` Christine Lemmer-Webber
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