From: Stefan Monnier <monnier@iro.umontreal.ca>
To: Dmitry Antipov <dmantipov@yandex.ru>
Cc: martin rudalics <rudalics@gmx.at>, emacs-devel@gnu.org
Subject: Re: Reachable killed buffers
Date: Tue, 11 Sep 2012 09:06:52 -0400 [thread overview]
Message-ID: <jwva9wwiukp.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <504ECB49.4050509@yandex.ru> (Dmitry Antipov's message of "Tue, 11 Sep 2012 09:25:29 +0400")
> IIUC both BLVs and frame/window buffer lists aren't shared. So, marking
> traversal which sees an owner symbol/frame/window for the first time
> sees these objects for the first time too (thus mark them correctly).
> And even we change buffer list or BLV so the marked object becomes
> unreachable, we just create some floating garbage which survives current
> GC but will be reclaimed during the next one.
The part where it gets less obvious is that swap_in_global_binding
doesn't only modify the BLV struct but also the C variable pointed to by
the `fwd' field and that variable is marked from elsewhere (staticpro,
for example).
As I said, I still think it's safe because we know the values we assign
there will be marked "real soon now" (via the "mark_object
(blv->defcell)" for example).
BTW, the "FIXME: make sure it's safe during GC." you placed before the
call to swap_in_global_binding should be turned into a "BEWARE: this is
called during GC, so make sure we ..." placed within swap_in_global_binding.
>> I don't see any reason to remove the previous comment since the change
>> doesn't affect its validity.
> IIUC this comment is partially invalid since lisp.h comment says that
> Lisp_Buffer_Local_Value can't be forwarded to buffer or kboard object
> (and this is really so).
Good point, yes, thanks for updating the comment.
Stefan
next prev parent reply other threads:[~2012-09-11 13:06 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 ` [Emacs-diffs] /srv/bzr/emacs/trunk r109890: Do not mark objects from deleted buffers, windows and frames Stefan Monnier
2012-09-05 19:15 ` 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 [this message]
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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