From: Tom Tromey <tromey@redhat.com>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: Emacs development discussions <emacs-devel@gnu.org>
Subject: Re: advice needed for multi-threading patch
Date: Sun, 27 Sep 2009 14:59:02 -0600 [thread overview]
Message-ID: <m3iqf4qf3d.fsf@fleche.redhat.com> (raw)
In-Reply-To: <jwvtyysnui4.fsf-monnier+emacs@gnu.org> (Stefan Monnier's message of "Thu, 24 Sep 2009 13:25:03 -0400")
>>>>> "Stefan" == Stefan Monnier <monnier@IRO.UMontreal.CA> writes:
[ releasing the buffer lock when yielding ]
Tom> I think this means it does not suffice to keep a simple per-thread count
Tom> of buffer-local bindings.
Stefan> Indeed. The lock should probably be on the buffer-local binding itself
Stefan> (i.e. the combination of the buffer and the variable).
I looked into this a bit; I think it can lead to deadlock too easily:
Thread A acquires V1 and requests V2
Thread B acquires V2 and requests V1
Instead, I think we could remove the buffer lock. Because we currently
use cooperative threading, most buffer operations are atomic with
respect to thread switches. So, it seems that if we fix the bindings
problem, we can probably just remove the buffer lock.
What do you think of that? Are there problems I've missed?
I wrote some elisp to modify the Emacs sources to use buffer accessor
macros everywhere (it handles like 90% of the references, a few tweaks
by hand are also needed). The only thing remaining is to fix up the
swap_in_symval_forwarding logic, which we have to do anyway.
Tom
next prev parent reply other threads:[~2009-09-27 20:59 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 [this message]
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
2009-08-29 4:57 ` Tom Tromey
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