From: Dmitry Antipov <dmantipov@yandex.ru>
To: Tom Tromey <tromey@redhat.com>
Cc: Dan Nicolaescu <dann@gnu.org>,
Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: Note on 109327
Date: Tue, 31 Jul 2012 17:50:43 +0400 [thread overview]
Message-ID: <5017E2B3.1060608@yandex.ru> (raw)
In-Reply-To: <877gtk12e1.fsf@fleche.redhat.com>
On 07/31/2012 05:33 PM, Tom Tromey wrote:
> Dmitry> Yes. I'm always thinking about improving internal stuff, GC at first.
> Dmitry> For me, the main motivation for BVAR, KVAR, FVAR etc. is the ability
> Dmitry> to catch the moment when the pointer (e.g. Lisp_Object) within buffer,
> Dmitry> or keyboard, of frame, etc. is read or written, which may be useful
> Dmitry> to implement write barriers (see, for exmaple,
> Dmitry> http://www.hoelzle.org/publications/write-barrier.pdf, but do not
> Dmitry> get confused with http://en.wikipedia.org/wiki/Memory_barrier).
>
> I think to do this well you will need separate macros for getting and
> setting.
Sure, but it's almost impossible to do this at once. At the very beginning,
it's possible to "overestimate" barrier assuming that each XVAR (obj, field)
changes FIELD in OBJ; in the future, reads and writes may be separated, thus
giving a precise write barrier.
Dmitry
next prev parent reply other threads:[~2012-07-31 13:50 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-07-31 12:38 Note on 109327 Dmitry Antipov
2012-07-31 13:13 ` Dan Nicolaescu
2012-07-31 13:25 ` Dmitry Antipov
2012-07-31 13:33 ` Tom Tromey
2012-07-31 13:50 ` Dmitry Antipov [this message]
2012-07-31 21:47 ` Thien-Thi Nguyen
2012-08-01 4:34 ` Dmitry Antipov
2012-07-31 13:54 ` Juanma Barranquero
2012-07-31 17:04 ` Eli Zaretskii
2012-07-31 17:17 ` Juanma Barranquero
2012-07-31 17:35 ` joakim
2012-07-31 17:56 ` Dmitry Antipov
2012-07-31 17:42 ` Dmitry Antipov
2012-07-31 18:06 ` Refactoring in Emacs (was: Note on 109327) Eli Zaretskii
2012-08-01 4:14 ` Refactoring in Emacs Dmitry Antipov
2012-08-01 11:41 ` Refactoring in Emacs : CEDET Eric M. Ludlam
2012-08-01 14:50 ` Eli Zaretskii
2012-08-01 23:42 ` Eric Ludlam
2012-08-01 22:41 ` Refactoring in Emacs Richard Stallman
2012-08-01 14:05 ` Jason Rumney
2012-07-31 15:16 ` Note on 109327 Jan Djärv
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