From: Stefan Monnier <monnier@iro.umontreal.ca>
To: rms@gnu.org
Cc: gscrivano@gnu.org, emacs-devel@gnu.org
Subject: Re: multi-threaded Emacs
Date: Fri, 05 Dec 2008 10:36:57 -0500 [thread overview]
Message-ID: <jwvy6yur63e.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <E1L8QuF-00045t-1q@fencepost.gnu.org> (Richard M. Stallman's message of "Thu, 04 Dec 2008 21:59:03 -0500")
> Actually, yielding in QUIT will take a lot of work. It's definitely not
> "cooperative" seen from Elisp's point of view (where QUIT can be run
> implicitly all over the place).
> I am surprised. Perhaps you're right, but why do you think so?
> Anywhere that calls QUIT is a place where it is safe for an error to happen,
> so why not a thread switch?
It will be safe in the sense that it won't cause a crash. But it will
mess up Elisp's semantics. Consider:
(dotimes (i 1000) (toto))
if you run this code twice in separate threads and allow context
switches at QUIT, then you'll basically be doing "preemptive
concurrency" seen from Elisp's point of view. Among other things, the
two threads will be fighting over the value of `i'.
So before this level of concurrency can be made to work we'll need to
fix dynamic scoping to be "per-thread" rather than global.
Note that the `yield' primitive won't be easy to use for the same kind
of reason (until we fix dynamic-scoping that is).
Stefan
next prev parent reply other threads:[~2008-12-05 15:36 UTC|newest]
Thread overview: 89+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-11-29 13:32 multi-threaded Emacs Giuseppe Scrivano
2008-11-29 20:26 ` Stefan Monnier
2008-11-29 21:01 ` Giuseppe Scrivano
2008-11-29 22:21 ` Stefan Monnier
2008-11-30 11:35 ` Giuseppe Scrivano
2008-11-30 21:46 ` Stefan Monnier
2008-11-30 22:25 ` Giuseppe Scrivano
2008-11-30 23:03 ` Stefan Monnier
2008-11-30 23:30 ` Giuseppe Scrivano
2008-12-01 3:37 ` Stefan Monnier
2008-12-06 22:50 ` Tom Tromey
2008-12-07 3:31 ` Stefan Monnier
2008-11-29 22:06 ` Tom Tromey
2008-11-30 16:43 ` Richard M Stallman
2008-11-30 17:34 ` Giuseppe Scrivano
2008-11-30 21:51 ` Stefan Monnier
2008-11-30 22:10 ` Giuseppe Scrivano
2008-11-30 22:20 ` Miles Bader
2008-11-30 23:09 ` Stefan Monnier
2008-11-30 23:09 ` Giuseppe Scrivano
2008-12-01 0:10 ` Chetan Pandya
2008-12-01 3:55 ` Stefan Monnier
2008-12-01 14:06 ` Richard M Stallman
2008-12-01 18:57 ` Giuseppe Scrivano
2008-12-01 20:34 ` Stefan Monnier
2008-12-01 22:41 ` joakim
2008-12-02 16:02 ` Richard M Stallman
2008-12-02 22:22 ` Stefan Monnier
2008-12-02 22:41 ` Giuseppe Scrivano
2008-12-03 2:17 ` Stefan Monnier
2008-12-03 18:26 ` Giuseppe Scrivano
2008-12-03 20:14 ` Stefan Monnier
2008-12-05 2:59 ` Richard M Stallman
2008-12-05 7:40 ` Giuseppe Scrivano
2008-12-05 8:20 ` Miles Bader
2008-12-05 9:42 ` Paul R
2008-12-05 10:10 ` Eli Zaretskii
2008-12-05 10:35 ` Paul R
2008-12-05 11:02 ` Helmut Eller
2008-12-05 15:39 ` Stefan Monnier
2008-12-05 16:22 ` Ted Zlatanov
2008-12-05 16:57 ` Tom Tromey
2008-12-06 4:41 ` Miles Bader
2008-12-06 7:44 ` Helmut Eller
2008-12-06 22:31 ` Stefan Monnier
2008-12-06 8:30 ` Richard M Stallman
2008-12-05 15:36 ` Stefan Monnier [this message]
2008-12-06 19:25 ` Richard M Stallman
2008-12-06 22:41 ` Stefan Monnier
2008-12-06 23:41 ` Giuseppe Scrivano
2008-12-07 20:51 ` Stefan Monnier
2008-12-07 23:51 ` Giuseppe Scrivano
2008-12-08 3:06 ` Chetan Pandya
2008-12-08 15:50 ` Stefan Monnier
2008-12-07 16:02 ` Richard M Stallman
2008-12-07 20:52 ` Stefan Monnier
2008-12-07 16:15 ` Giuseppe Scrivano
2008-12-08 18:26 ` Richard M Stallman
2008-12-08 19:49 ` Giuseppe Scrivano
2008-12-09 2:15 ` dhruva
2008-12-09 2:49 ` Stephen J. Turnbull
2008-12-09 2:53 ` dhruva
2008-12-09 9:36 ` Andreas Schwab
2008-12-09 17:26 ` Richard M Stallman
2008-12-09 19:10 ` Giuseppe Scrivano
2008-12-10 18:18 ` Richard M Stallman
2008-12-10 18:18 ` Richard M Stallman
2008-12-09 19:40 ` Stefan Monnier
2008-12-10 18:18 ` Richard M Stallman
2008-12-11 1:59 ` Stefan Monnier
2008-12-11 14:41 ` Ted Zlatanov
2008-12-11 18:30 ` Stefan Monnier
2008-12-11 18:42 ` Ted Zlatanov
2008-12-11 19:01 ` Paul R
2008-12-11 20:53 ` Stefan Monnier
2008-12-12 19:03 ` Giuseppe Scrivano
2008-12-13 3:08 ` Stefan Monnier
2008-12-11 19:07 ` Paul R
2008-12-11 20:54 ` Stefan Monnier
2008-12-05 2:59 ` Richard M Stallman
2008-12-05 15:40 ` Stefan Monnier
2008-12-02 23:10 ` Florian Beck
2008-11-30 22:17 ` Miles Bader
2008-11-30 16:44 ` Richard M Stallman
-- strict thread matches above, loose matches on Subject: below --
2008-12-03 7:59 Re[2]: " ak70
2008-12-04 8:45 ` Richard M Stallman
[not found] ` <87prk8mhg9.fsf@vanilla.net.mt>
[not found] ` <E1L8ZUB-0002x3-VT@fencepost.gnu.org>
2008-12-05 13:27 ` Li Lin
[not found] ` <87prk64ilv.fsf@vanilla.net.mt>
2008-12-05 18:37 ` Giuseppe Scrivano
2008-12-06 21:58 ` Magnus Henoch
2008-12-04 13:21 ` Stefan Monnier
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