From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Dmitry Antipov <dmantipov@yandex.ru>
Cc: emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r109890: Do not mark objects from deleted buffers, windows and frames.
Date: Wed, 05 Sep 2012 14:24:41 -0400 [thread overview]
Message-ID: <jwvwr08xrip.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1T9II0-0005q4-Gh@vcs.savannah.gnu.org> (Dmitry Antipov's message of "Wed, 05 Sep 2012 19:34:45 +0400")
> Do not mark objects from deleted buffers, windows and frames.
I'm not sure this is safe. Such deleted objects are still perfectly
live from the memory-allocation point of view, and while some operations
on them are disallowed "for ever", there are others that might still be
permitted and which may still access internal data.
E.g. you might still be able to get (window|frame)-parameters of
a deleted (window|frame).
IOW, it adds lines of code, makes the invariants more complex (in ways
which I'm not sure is currently ensured by the rest of the code) and the
benefits aren't obvious at all.
I don't think scanning those objects can take a noticeable amount of
time, so the only potential issue is holding on to data that can never
be used again, in which case I'd much prefer changing
kill-buffer/delete-(window|frame) so they set the various fields to
NULL/nil. Which is a much safer change.
Stefan
next parent reply other threads:[~2012-09-05 18:24 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <E1T9II0-0005q4-Gh@vcs.savannah.gnu.org>
2012-09-05 18:24 ` Stefan Monnier [this message]
2012-09-05 19:15 ` [Emacs-diffs] /srv/bzr/emacs/trunk r109890: Do not mark objects from deleted buffers, windows and frames Stefan Monnier
2012-09-06 6:55 ` Dmitry Antipov
2012-09-06 7:00 ` Herring, Davis
2012-09-06 7:28 ` martin rudalics
2012-09-06 9:57 ` Dmitry Antipov
2012-09-06 14:42 ` martin rudalics
2012-09-06 12:53 ` Stefan Monnier
2012-09-06 14:42 ` martin rudalics
2012-09-06 12:52 ` Stefan Monnier
2012-09-06 14:42 ` martin rudalics
2012-09-06 17:33 ` Stefan Monnier
2012-09-07 9:52 ` martin rudalics
2012-09-06 17:06 ` Dmitry Antipov
2012-09-06 17:37 ` Stefan Monnier
2012-09-07 9:53 ` martin rudalics
2012-09-07 15:19 ` Stefan Monnier
2012-09-10 9:46 ` Reachable killed buffers [Was: Re: [Emacs-diffs] /srv/bzr/emacs/trunk r109890: Do not mark objects from deleted buffers, windows and frames] Dmitry Antipov
2012-09-10 13:25 ` Stefan Monnier
2012-09-10 15:15 ` Reachable killed buffers Dmitry Antipov
2012-09-10 20:15 ` Stefan Monnier
2012-09-10 21:10 ` Stefan Monnier
2012-09-11 5:25 ` Dmitry Antipov
2012-09-11 13:06 ` Stefan Monnier
2012-09-12 8:09 ` martin rudalics
2012-09-12 13:47 ` Paul Eggert
2012-09-12 13:59 ` Dmitry Antipov
2012-09-12 14:05 ` Paul Eggert
2012-09-12 14:15 ` martin rudalics
2012-09-12 15:59 ` Dmitry Antipov
2012-09-12 17:37 ` martin rudalics
2012-09-12 17:55 ` Paul Eggert
2012-09-13 3:29 ` Stefan Monnier
2012-09-13 4:43 ` Paul Eggert
2012-09-13 5:00 ` Dmitry Antipov
2012-09-13 5:18 ` Paul Eggert
2012-09-13 12:47 ` Stefan Monnier
2012-09-13 16:49 ` martin rudalics
2012-09-13 17:11 ` Paul Eggert
2012-09-13 17:30 ` martin rudalics
2012-09-14 12:10 ` Dmitry Antipov
2012-09-14 13:29 ` Stefan Monnier
2012-09-14 13:38 ` martin rudalics
2012-09-13 18:01 ` Dmitry Antipov
2012-09-06 7:20 ` [Emacs-diffs] /srv/bzr/emacs/trunk r109890: Do not mark objects from deleted buffers, windows and frames martin rudalics
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