From: Eli Zaretskii <eliz@gnu.org>
To: "Óscar Fuentes" <ofv@wanadoo.es>
Cc: emacs-devel@gnu.org
Subject: Re: Emacs and Gnome Canvas
Date: Sat, 17 Jul 2010 10:57:55 +0300 [thread overview]
Message-ID: <83630efsl8.fsf@gnu.org> (raw)
In-Reply-To: <87r5j36kc4.fsf@telefonica.net>
> From: Óscar Fuentes <ofv@wanadoo.es>
> Date: Sat, 17 Jul 2010 02:08:43 +0200
>
> Second, whatever mechanism Emacs uses for memory management, it is
> usable from C++ as well (for dealing with Emacs objects, of course.)
How can you be sure?
Emacs overrides the default `malloc' and `sbrk' functions, at least on
some platforms, and replaces them with its own implementations. Those
implementations relocate large objects on the heap behind the scenes,
whenever Emacs sees fit. I'm not sure this is "usable from C++" out
of the box. C++ objects that hold pointers to arrays might suddenly
find those pointers invalidated by the above-mentioned relocation.
We had quite a few bugs caused by that in Emacs, even though the issue
is well known and there are special protocols in Emacs sources to
follow in order to avoid that. See, for example these messages
regarding one such bug:
http://lists.gnu.org/archive/html/emacs-devel/2010-02/msg00666.html
http://lists.gnu.org/archive/html/emacs-devel/2010-02/msg00702.html
http://lists.gnu.org/archive/html/emacs-devel/2010-03/msg00088.html
If you want to see the fix, it's revno 99601 on the trunk.
> Is it better to not try it, then?
No. But you need to be careful when you are choosing your tools of
trade -- they need to allow you to concentrate on the important
issues, instead of wasting energy on obstacles that have nothing to do
with the problems you intend to solve.
next prev parent reply other threads:[~2010-07-17 7:57 UTC|newest]
Thread overview: 118+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-13 19:02 Emacs, QT and Cairo Was: Re: Efforts to attract more users? Stephen Eilert
2010-07-13 19:29 ` Chong Yidong
2010-07-13 19:51 ` Chad Brown
2010-07-13 20:48 ` Jan Djärv
2010-07-13 22:30 ` Emacs, QT and Cairo Chad Brown
2010-07-14 1:39 ` Stephen J. Turnbull
2010-07-14 2:32 ` Óscar Fuentes
2010-07-14 7:29 ` Eli Zaretskii
2010-07-14 18:37 ` Chad Brown
2010-07-14 20:45 ` Eli Zaretskii
2010-07-14 21:24 ` Óscar Fuentes
2010-07-15 6:55 ` Emacs and Gnome Canvas (was: Emacs, QT and Cairo) Eli Zaretskii
2010-07-15 7:46 ` Emacs and Gnome Canvas Jan Djärv
2010-07-15 7:53 ` Jan Djärv
2010-07-15 8:36 ` joakim
2010-07-15 8:40 ` Eli Zaretskii
2010-07-15 8:50 ` Jan Djärv
2010-07-15 8:38 ` Eli Zaretskii
2010-07-15 8:48 ` Jan Djärv
2010-07-15 8:59 ` Eli Zaretskii
2010-07-15 9:29 ` Jan Djärv
2010-07-15 10:24 ` Eli Zaretskii
2010-07-15 10:54 ` Jan Djärv
2010-07-15 12:27 ` Eli Zaretskii
2010-07-15 14:18 ` Óscar Fuentes
2010-07-15 15:14 ` Eli Zaretskii
2010-07-16 6:33 ` Miles Bader
2010-07-15 16:00 ` Chong Yidong
2010-07-15 16:27 ` Óscar Fuentes
2010-07-15 17:06 ` Eli Zaretskii
2010-07-15 17:48 ` Óscar Fuentes
2010-07-15 18:06 ` Eli Zaretskii
2010-07-15 21:27 ` Óscar Fuentes
2010-07-16 8:17 ` Eli Zaretskii
2010-07-16 14:24 ` Óscar Fuentes
2010-07-16 15:19 ` Eli Zaretskii
2010-07-16 16:07 ` Óscar Fuentes
2010-07-16 18:43 ` Eli Zaretskii
2010-07-16 21:21 ` Óscar Fuentes
2010-07-16 23:44 ` Chad Brown
2010-07-17 0:08 ` Óscar Fuentes
2010-07-17 7:57 ` Eli Zaretskii [this message]
2010-07-17 8:34 ` Andreas Schwab
2010-07-17 9:10 ` Eli Zaretskii
2010-07-17 9:40 ` Andreas Schwab
2010-07-17 10:23 ` Eli Zaretskii
2010-07-17 13:49 ` Óscar Fuentes
2010-07-17 7:27 ` Eli Zaretskii
2010-07-17 13:42 ` Óscar Fuentes
2010-07-17 15:27 ` Eli Zaretskii
2010-07-17 21:53 ` Óscar Fuentes
2010-07-18 1:42 ` Miles Bader
2010-07-18 2:45 ` Óscar Fuentes
2010-07-18 8:06 ` Chad Brown
2010-07-18 14:43 ` Óscar Fuentes
2010-07-21 8:34 ` Stefan Monnier
2010-07-22 14:26 ` Stefan Monnier
2010-07-15 17:22 ` Chong Yidong
2010-07-15 18:02 ` Óscar Fuentes
2010-07-15 22:10 ` Stephen Eilert
2010-07-16 7:52 ` Eli Zaretskii
2010-07-16 2:14 ` YAMAMOTO Mitsuharu
2010-07-16 7:33 ` Jan Djärv
2010-07-16 9:52 ` Eli Zaretskii
2010-07-16 10:15 ` YAMAMOTO Mitsuharu
2010-07-16 10:39 ` Eli Zaretskii
2010-07-16 12:42 ` Jan Djärv
2010-07-17 3:50 ` YAMAMOTO Mitsuharu
2010-07-17 8:33 ` Jan Djärv
2010-07-17 8:38 ` YAMAMOTO Mitsuharu
2010-07-17 9:18 ` Jan Djärv
2010-07-17 9:25 ` YAMAMOTO Mitsuharu
2010-07-17 10:26 ` Jan Djärv
2010-07-18 3:51 ` YAMAMOTO Mitsuharu
2010-07-18 7:10 ` Jan Djärv
2010-07-18 7:45 ` YAMAMOTO Mitsuharu
2010-07-18 9:06 ` Jan Djärv
2010-07-19 0:50 ` YAMAMOTO Mitsuharu
2010-07-17 1:00 ` YAMAMOTO Mitsuharu
2010-07-17 1:40 ` YAMAMOTO Mitsuharu
2010-07-17 8:04 ` Eli Zaretskii
2010-07-17 8:25 ` YAMAMOTO Mitsuharu
2010-07-16 12:21 ` Jan Djärv
2010-07-16 10:01 ` YAMAMOTO Mitsuharu
2010-07-16 12:26 ` Jan Djärv
2010-07-16 14:05 ` Davis Herring
2010-07-16 17:38 ` Jan Djärv
2010-07-17 1:12 ` YAMAMOTO Mitsuharu
2010-07-17 7:14 ` Eli Zaretskii
2010-07-17 7:31 ` YAMAMOTO Mitsuharu
2010-07-17 8:12 ` Eli Zaretskii
2010-07-17 8:32 ` YAMAMOTO Mitsuharu
2010-07-15 14:24 ` Jan Djärv
2010-07-15 14:35 ` Eli Zaretskii
2010-07-15 15:16 ` Jan Djärv
2010-07-15 15:20 ` Eli Zaretskii
2010-07-15 17:14 ` Jan Djärv
2010-07-15 9:20 ` Andy Wingo
2010-07-15 18:41 ` Emacs and Gnome Canvas (was: Emacs, QT and Cairo) Dirk-Jan C. Binnema
2010-07-15 21:51 ` Emacs and Gnome Canvas Óscar Fuentes
2010-07-15 22:21 ` Bruce Stephens
2010-07-27 21:24 ` Emacs, QT and Cairo Stefan Monnier
2010-07-27 21:36 ` Chad Brown
2010-07-28 3:05 ` Eli Zaretskii
2010-07-14 8:59 ` Emacs, QT and Cairo Was: Re: Efforts to attract more users? YAMAMOTO Mitsuharu
2010-07-14 9:41 ` Emacs, QT and Cairo David Engster
2010-07-14 9:56 ` Jan Djärv
2010-07-14 13:50 ` Drew Adams
2010-07-14 14:14 ` David Engster
2010-07-14 14:28 ` joakim
2010-07-14 15:41 ` Emacs, QT and Cairo Was: Re: Efforts to attract more users? Chong Yidong
2010-07-14 16:17 ` joakim
2010-07-14 18:04 ` Jan Djärv
2010-07-15 23:15 ` Andrew W. Nosenko
2010-07-16 7:41 ` Jan Djärv
2010-07-16 10:24 ` Andrew W. Nosenko
2010-07-16 12:36 ` Jan Djärv
-- strict thread matches above, loose matches on Subject: below --
2010-07-17 19:02 Emacs and Gnome Canvas grischka
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