From: Eli Zaretskii <eliz@gnu.org>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: lekktu@gmail.com, eggert@cs.ucla.edu, 12450@debbugs.gnu.org
Subject: bug#12450: Remove configure's --without-sync-input option.
Date: Sun, 16 Sep 2012 08:55:14 +0300 [thread overview]
Message-ID: <83k3vuse9p.fsf@gnu.org> (raw)
In-Reply-To: <jwvtxuz9ex2.fsf-monnier+emacs@gnu.org>
> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Eli Zaretskii <eliz@gnu.org>, lekktu@gmail.com, 12450@debbugs.gnu.org
> Date: Sat, 15 Sep 2012 17:12:13 -0400
>
> >> If someone can describe in detail what SYNC_INPUT means
>
> Maybe not quite, because it was implemented rather than designed.
> But SYNC_INPUT's purpose is to reduce the code run during POSIX's signal
> handling to its minimum (since it's basically unsafe to do anything in
> there, due to POSIX's definition of signal handling), so it only sets
> a global var (pending_signals) which is then polled by QUIT, so that the
> real code reacting to the arrival of a signal is run synchronously.
>
> This avoids problems such as malloc being called in the middle of
> another malloc invocation.
>
> The downside of SYNC_INPUT is that we may fail to poll pending_signals
> often enough and hence become unresponsive. Since SYNC_INPUT has been
> the default for a long while now, I think we can drop the non-SYNC_INPUT
> case, indeed, as suggested by Paul. But I don't know how it interacts
> with the non-X11 code.
Could you please describe how the SYNC_INPUT code is supposed to work
in the following situations:
. keyboard input on a TTY that comes while Lisp is running
. an X event that exposes an Emacs frame in a GUI session, coming
while Lisp is running
Thanks.
next prev parent reply other threads:[~2012-09-16 5:55 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-15 7:54 bug#12450: Remove configure's --without-sync-input option Paul Eggert
2012-09-15 9:32 ` Eli Zaretskii
2012-09-15 10:14 ` Paul Eggert
2012-09-15 11:03 ` Eli Zaretskii
2012-09-15 19:59 ` Paul Eggert
2012-09-15 20:15 ` Eli Zaretskii
2012-09-15 20:31 ` Paul Eggert
2012-09-16 6:33 ` Eli Zaretskii
2012-09-16 7:47 ` Paul Eggert
2012-09-16 8:05 ` Eli Zaretskii
2012-09-16 8:17 ` Paul Eggert
2012-09-16 8:21 ` Eli Zaretskii
2012-09-16 8:24 ` Eli Zaretskii
2012-09-16 8:34 ` Paul Eggert
2012-09-16 8:53 ` Eli Zaretskii
2012-09-15 21:12 ` Stefan Monnier
2012-09-16 5:55 ` Eli Zaretskii [this message]
2012-09-16 14:58 ` Stefan Monnier
2012-09-16 15:45 ` Eli Zaretskii
2012-09-16 16:30 ` Paul Eggert
2012-09-16 18:40 ` Eli Zaretskii
2012-09-16 19:55 ` Jan Djärv
2012-09-16 18:37 ` Stefan Monnier
2012-09-16 9:33 ` Daniel Colascione
2012-09-16 10:43 ` Eli Zaretskii
2012-09-16 15:10 ` Stefan Monnier
2012-09-16 15:40 ` Eli Zaretskii
2012-09-15 22:18 ` Richard Stallman
2012-09-16 3:15 ` Paul Eggert
2012-09-16 6:10 ` Eli Zaretskii
2012-09-16 8:23 ` Paul Eggert
2012-09-16 8:32 ` Eli Zaretskii
2012-09-16 21:48 ` Paul Eggert
2012-09-17 7:42 ` Eli Zaretskii
2012-09-21 20:50 ` Paul Eggert
2012-09-22 9:03 ` Eli Zaretskii
2012-09-22 9:34 ` Paul Eggert
2012-09-22 9:50 ` Eli Zaretskii
2012-09-22 10:01 ` Paul Eggert
2012-09-16 9:52 ` Daniel Colascione
2012-09-16 10:44 ` Eli Zaretskii
2012-09-16 10:56 ` Daniel Colascione
2012-09-17 7:41 ` Eli Zaretskii
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