From: Giuseppe Scrivano <gscrivano@gnu.org>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: Tom Tromey <tromey@redhat.com>,
Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: advice needed for multi-threading patch
Date: Wed, 23 Sep 2009 20:43:38 +0200 [thread overview]
Message-ID: <87zl8lwlgl.fsf@master.homenet> (raw)
In-Reply-To: <jwvab0nqdag.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Tue, 22 Sep 2009 10:24:15 -0400")
Hello,
Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
>> Right now when a thread yields it does not release its buffer lock.
>
> I think it should, unless some of the buffer-local variables are
> let-bound by the thread.
I think actually this is one of the most important decision to take, it
will have a direct influence on buffer-local variables semantic. In my
opinion, it is better to have few constraints and allow switch as often
as possible.
As Tom said, I was experimenting with gnus and it made me quite
optimistic; in fact these commands are completed successfully:
(run-in-thread '(gnus) t) ;; with t the thread doesn't attempt to get
;; a lock on the buffer.
(while (yield)) ;; yield returns nil when there are not other
;; threads -- simulate join.
The nolock argument in run-in-thread is just a hack to get things
working and see quickly some results. Acquiring always the lock when
accessing the buffer is too restrictive IMHO as too often the buffer is
already locked.
Following your advice to don't allow a switch only when buffer-local
variables are let-bound by the thread, how many times it happens than a
thread let-bound these variables? Let's say on 100 times, how many
times approximately do you think a switch will not be allowed and the
calling thread blocked?
Cheers,
Giuseppe
next prev parent reply other threads:[~2009-09-23 18:43 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 [this message]
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
2009-08-29 4:57 ` Tom Tromey
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