From: Giuseppe Scrivano <gscrivano@gnu.org>
To: Tom Tromey <tromey@redhat.com>
Cc: Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: advice needed for multi-threading patch
Date: Sat, 29 Aug 2009 02:28:33 +0200 [thread overview]
Message-ID: <87vdk7xy32.fsf@master.homenet> (raw)
In-Reply-To: <m3eiqz2nqm.fsf@fleche.redhat.com> (Tom Tromey's message of "Tue, 25 Aug 2009 22:38:41 -0600")
Hello Tom,
I only now saw this thread and multi-threaded Emacs is still in my
wish-list :-) Do you already have some working code? I was expecting
the final migration to BZR before start working again on it.
Last time that I rebased my patch, approximately two months ago, it was
still working and I think something can be re-used from it.
In my work, I didn't consider threads local storage for two reasons the
first and most important is that elisp packages (yet?) don't know about
it and wouldn't use; the second reason is that it adds a lot of
complexity while I don't see much benefits so I chose simplicity.
Probably threads local storage can be useful when the cooperative model
will be changed to something more serious, but that is another story :-)
Cheers,
Giuseppe
Tom Tromey <tromey@redhat.com> writes:
> I was inspired by Giuseppe Scrivano's work from last year:
>
> http://lists.gnu.org/archive/html/emacs-devel/2008-11/msg01067.html
>
> ... so I started working on my own patch to implement multi-threading in
> Emacs. I've tried to follow Stefan's advice as given in that thread.
> In particular I've (initially) implemented cooperative multi-threading.
>
> Some background for my particular question:
>
> My implementation of dynamic binding uses a structure like so:
>
> struct Lisp_ThreadLocal
> {
> enum Lisp_Misc_Type type : 16; /* = Lisp_Misc_ThreadLocal */
> unsigned gcmarkbit : 1;
> int spacer : 15;
> Lisp_Object global;
> Lisp_Object thread_alist;
> };
>
> ... the idea being that a let-bound variable will be on 'thread_alist'
> (keyed by the thread), and other threads will see the value in 'global'.
> These objects are found in symbol value slots.
>
> I managed to handle the V* global variables by writing some elisp that
> changed every declaration of a variable mentioned in a DEFVAR_LISP from
> Vfoo to impl_Vfoo and also emitted a new header with a lot of:
>
> #define Vfoo *find_variable_location (&impl_Vfoo)
>
> This was pretty simple and non-intrusive, in the sense that it is
> totally automated, so I can easily reapply it as Emacs changes.
>
> ... which brings me to my problem. I'd also like to apply a similar
> treatment to buffer-local variables. However, those do not have
> convenient accessor macros, and before starting the laborious task of
> wrapping all buffer field accesses, I thought I'd ask for advice. Is
> this a sane way to proceed? Should I do something different? Could I
> get such a patch in before the rest of this work, just to make my local
> divergence smaller?
>
> I'll also note that the above approach does not work for DEFVAR_INT. I
> have a plan for those but I fear it is somewhat expensive. If you have
> an idea...
>
> Tom
next prev parent reply other threads:[~2009-08-29 0:28 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-08-26 4:38 advice needed for multi-threading patch Tom Tromey
2009-08-26 7:06 ` Ken Raeburn
2009-08-26 14:52 ` Stefan Monnier
2009-08-26 18:50 ` Ken Raeburn
2009-08-27 3:12 ` Stefan Monnier
2009-08-27 6:28 ` Ken Raeburn
2009-08-27 17:02 ` Stefan Monnier
2009-08-26 16:08 ` Tom Tromey
2009-08-26 18:50 ` Ken Raeburn
2009-08-27 5:07 ` Miles Bader
2009-08-27 6:39 ` Ken Raeburn
2009-08-27 6:50 ` Miles Bader
2009-08-28 20:48 ` Juri Linkov
2009-08-28 22:15 ` Miles Bader
2009-08-28 23:27 ` Juri Linkov
2009-08-28 23:54 ` Miles Bader
2009-08-29 20:21 ` Richard Stallman
2009-08-26 15:02 ` Stefan Monnier
2009-08-26 15:31 ` Tom Tromey
2009-08-26 19:18 ` Stefan Monnier
2009-09-18 22:59 ` Tom Tromey
2009-09-19 0:09 ` Stephen J. Turnbull
2009-09-19 0:32 ` Chong Yidong
2009-09-21 21:19 ` Stefan Monnier
2009-09-21 21:50 ` Tom Tromey
2009-09-22 14:24 ` Stefan Monnier
2009-09-22 23:59 ` Ken Raeburn
2009-09-23 3:11 ` Stefan Monnier
2009-09-23 15:53 ` Chong Yidong
2009-09-23 3:16 ` Tom Tromey
2009-09-24 17:25 ` Stefan Monnier
2009-09-24 17:57 ` Tom Tromey
2009-09-27 20:59 ` Tom Tromey
2009-09-27 23:05 ` Stefan Monnier
2009-09-28 4:27 ` Tom Tromey
2009-09-29 0:27 ` Stefan Monnier
2009-09-29 2:26 ` Ken Raeburn
2009-09-29 3:20 ` Stefan Monnier
2009-09-29 3:57 ` Ken Raeburn
2009-09-29 3:33 ` Tom Tromey
2009-09-29 4:07 ` Ken Raeburn
2009-09-29 2:30 ` Tom Tromey
2009-09-23 18:43 ` Giuseppe Scrivano
2009-09-24 17:29 ` Stefan Monnier
2009-09-24 18:53 ` Giuseppe Scrivano
2009-09-24 20:04 ` Tom Tromey
2009-09-24 21:59 ` Stefan Monnier
2009-09-24 22:23 ` Giuseppe Scrivano
2009-09-24 22:47 ` Ken Raeburn
2009-09-28 14:52 ` Ted Zlatanov
2009-10-05 6:02 ` joakim
2009-09-28 7:44 ` Lynbech Christian
2009-08-29 0:28 ` Giuseppe Scrivano [this message]
2009-08-29 4:57 ` Tom Tromey
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