From: Tom Tromey <tromey@redhat.com>
To: rms@gnu.org
Cc: Helmut Eller <eller.helmut@gmail.com>, emacs-devel@gnu.org
Subject: Re: Patch for fields of `struct buffer'
Date: Tue, 08 Feb 2011 09:30:16 -0700 [thread overview]
Message-ID: <m3mxm6v693.fsf@fleche.redhat.com> (raw)
In-Reply-To: <E1PmWgl-0000Sk-SN@fencepost.gnu.org> (Richard Stallman's message of "Mon, 07 Feb 2011 14:23:55 -0500")
RMS> It would be easy enough to stop one buffer from being current in more
RMS> than one thread. Just make set-buffer do the interlocking. That
RMS> would be an easy change, and it would block threads less often than
RMS> the above idea.
RMS> But even that could be too much blocking of threads. If a thread
RMS> is sitting idle with a certain buffer current, that would block
RMS> all other threads from operating on it. That would be a big problem.
I actually tried to put a buffer lock in set-buffer and in the end
concluded that it was too much trouble.
One problem comes up immediately: what is the current buffer of a new
thread? It can't be the parent's thread buffer, since that means new
threads won't run until the parent thread changes buffers. And, there
is no guarantee that there is more than one buffer.
Making Emacs safe for preemptive threads is, as you say, quite hard. It
is even hard at the micro level -- ensuring that operations like XCAR
are atomic.
Tom
next prev parent reply other threads:[~2011-02-08 16:30 UTC|newest]
Thread overview: 123+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-27 20:18 Patch for fields of `struct buffer' Tom Tromey
2011-01-28 7:37 ` Eli Zaretskii
2011-01-28 8:58 ` Tom Tromey
2011-01-28 9:29 ` Eli Zaretskii
2011-01-29 12:50 ` Eli Zaretskii
2011-01-29 13:33 ` Juanma Barranquero
2011-01-29 13:42 ` Eli Zaretskii
2011-02-02 18:17 ` Juanma Barranquero
2011-02-02 19:51 ` Eli Zaretskii
2011-01-28 14:55 ` Stefan Monnier
2011-01-28 17:38 ` Tom Tromey
2011-01-28 18:27 ` Stefan Monnier
2011-01-28 18:42 ` Tom Tromey
2011-01-28 20:04 ` Stefan Monnier
2011-01-28 17:23 ` Kim F. Storm
2011-01-28 17:36 ` Tom Tromey
2011-01-28 18:29 ` Stefan Monnier
2011-01-29 2:34 ` Miles Bader
2011-01-29 3:58 ` Stefan Monnier
2011-01-29 16:18 ` Richard Stallman
2011-01-30 20:23 ` Tom Tromey
2011-01-31 4:04 ` Stefan Monnier
2011-01-31 14:29 ` Tom Tromey
2011-01-31 15:22 ` Stefan Monnier
2011-01-31 15:30 ` Tom Tromey
2011-01-31 17:02 ` Stefan Monnier
2011-01-31 18:38 ` Tom Tromey
2011-01-31 20:03 ` Stefan Monnier
2011-01-31 20:00 ` Stefan Monnier
2011-01-31 20:05 ` Tom Tromey
2011-01-31 20:40 ` Stefan Monnier
2011-01-31 16:46 ` David De La Harpe Golden
2011-01-31 19:04 ` Tom Tromey
2011-01-31 22:08 ` David De La Harpe Golden
2011-02-01 10:54 ` Daniel Colascione
2011-02-07 2:34 ` Tom Tromey
2011-02-07 19:48 ` concurrency suggestions for Gnus (was: Patch for fields of `struct buffer') Ted Zlatanov
2011-02-08 4:31 ` concurrency suggestions for Gnus Miles Bader
2011-02-08 12:55 ` Andy Moreton
2011-02-08 12:55 ` Justin Lilly
2011-02-08 14:41 ` bloom filters (was: concurrency suggestions for Gnus) Ted Zlatanov
2011-02-08 15:15 ` Stephen J. Turnbull
2011-02-10 8:17 ` concurrency suggestions for Gnus Lars Ingebrigtsen
2011-02-01 15:43 ` Patch for fields of `struct buffer' Stefan Monnier
2011-02-01 16:28 ` Helmut Eller
2011-02-07 2:47 ` Tom Tromey
2011-02-07 2:44 ` Tom Tromey
2011-02-07 8:05 ` Helmut Eller
2011-02-07 19:23 ` Richard Stallman
2011-02-08 16:30 ` Tom Tromey [this message]
2011-02-08 16:26 ` Tom Tromey
2011-02-08 17:57 ` Helmut Eller
2011-02-11 21:59 ` Tom Tromey
2011-02-12 9:16 ` Helmut Eller
2011-02-08 21:10 ` Stefan Monnier
2011-01-31 19:38 ` Richard Stallman
2011-02-01 18:26 ` Tom Tromey
2011-02-01 19:28 ` Paul Eggert
2011-02-01 19:42 ` Tom Tromey
2011-02-09 10:16 ` Jim Meyering
2011-02-10 4:42 ` Miles Bader
2011-02-01 20:34 ` Andreas Schwab
2011-02-01 21:56 ` Tom Tromey
2011-02-01 21:59 ` Tom Tromey
2011-02-02 0:44 ` Paul Eggert
2011-02-02 3:49 ` Stefan Monnier
2011-02-02 16:26 ` Tom Tromey
2011-02-02 16:37 ` Stefan Monnier
2011-02-08 15:07 ` Tom Tromey
2011-02-08 21:02 ` Stefan Monnier
2011-02-08 21:08 ` Tom Tromey
2011-02-08 21:21 ` Tom Tromey
2011-02-09 21:32 ` Stefan Monnier
2011-02-08 21:58 ` Andreas Schwab
2011-02-01 22:21 ` Stefan Monnier
2011-02-08 16:38 ` Tom Tromey
2011-02-11 21:48 ` Tom Tromey
2011-02-12 2:25 ` Stefan Monnier
2011-01-31 19:37 ` Richard Stallman
2011-01-31 19:57 ` Tom Tromey
2011-02-01 2:42 ` Tom Tromey
2011-02-01 4:09 ` Eli Zaretskii
2011-02-01 16:40 ` Richard Stallman
2011-02-01 16:44 ` Tom Tromey
2011-02-02 2:42 ` Richard Stallman
2011-01-31 20:30 ` Stefan Monnier
2011-01-31 20:49 ` Tom Tromey
2011-01-31 21:54 ` Stefan Monnier
2011-02-13 19:01 ` Richard Stallman
2011-02-14 17:47 ` Stefan Monnier
2011-02-14 19:34 ` Lennart Borgman
2011-02-15 15:58 ` Richard Stallman
2011-02-15 20:41 ` Stefan Monnier
2011-02-01 16:39 ` Richard Stallman
2011-02-01 12:09 ` Stephen J. Turnbull
2011-02-02 2:41 ` Richard Stallman
2011-02-01 10:26 ` Daniel Colascione
2011-02-01 12:10 ` Stephen J. Turnbull
2011-02-01 14:23 ` Lennart Borgman
2011-02-01 16:19 ` Stephen J. Turnbull
2011-02-01 17:08 ` Lennart Borgman
2011-02-01 19:57 ` Daniel Colascione
2011-02-01 20:06 ` Daniel Colascione
2011-02-01 16:41 ` Richard Stallman
2011-02-01 16:51 ` Tom Tromey
2011-02-02 2:42 ` Richard Stallman
2011-02-02 4:16 ` Tom Tromey
2011-02-02 5:04 ` Stefan Monnier
2011-02-11 21:51 ` Tom Tromey
2011-02-12 23:28 ` Richard Stallman
2011-02-13 20:26 ` Installing `struct buffer' patch (Was: Patch for fields of `struct buffer') Tom Tromey
2011-02-14 16:42 ` Installing `struct buffer' patch Chong Yidong
2011-02-14 16:48 ` Tom Tromey
2011-02-14 16:52 ` Chong Yidong
2011-02-14 16:58 ` Tom Tromey
2011-02-14 17:36 ` Stefan Monnier
2011-02-15 15:50 ` Chong Yidong
2011-02-16 14:55 ` Tom Tromey
2011-02-15 15:57 ` Richard Stallman
2011-02-15 4:07 ` Glenn Morris
2011-02-15 14:28 ` Tom Tromey
2011-02-01 20:04 ` Patch for fields of `struct buffer' Daniel Colascione
2011-02-02 2:43 ` Richard Stallman
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