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From: Stefan Monnier <monnier@iro.umontreal.ca>
To: "Lennart Borgman \(gmail\)" <lennart.borgman@gmail.com>
Cc: martin rudalics <rudalics@gmx.at>, Emacs Devel <emacs-devel@gnu.org>
Subject: Re: Three strikes them out
Date: Sun, 01 Jun 2008 22:16:24 -0400	[thread overview]
Message-ID: <jwvskvx16w9.fsf-monnier+emacs@gnu.org> (raw)
In-Reply-To: <484118F0.2050805@gmail.com> (Lennart Borgman's message of "Sat,  31 May 2008 11:22:56 +0200")

>> >> What makes you think the problem is in the timers?
>> >> I can't remember encountering such a problem.
>> >
>> > I know that something is looping during fontification. (Sometimes it is
>> > my bad, sometimes it is things I do not understand.)
>> 
>> What happens when you set `jit-lock-context-time' to a very large value?

> I can dig up one of those cases that loops and try it, but why do you
> propose that? (It might of course help a bit to find out where the problem
> happens and I have one case where this could indeed be interesting, but I am
> not sure if that is what you mean.)

> The general problem that looping in a timer may hang Emacs is what I really
> wanted to address here.

Yes, but depending on how it happens, the way to solve it may
be different.  E.g. is the problem that C-g is ignored?  Or that it is
obeyed but we immediately get back into the problematic code?
Is the problematic code really triggered by timers, rather than by
display hooks like jit-lock?

I think there's a lot of room for improvement in how Emacs allows the
user to get back control in some cases, but this is all very difficult.
Regarding Miles's issue with "hitting C-g frantically", this is an
important point (I do that too in all kinds of cases), but that doesn't
mean we can't do what you want: it just means we have to distinguish
those two situations.  E.g. the "3 C-g" rules might only apply if
some amount of time elapses between them, and if the currently running
code in all 3 is "similar", ... that doesn't sound quite right either,
but that just indicates that it's a hard problem ;-)


        Stefan




      parent reply	other threads:[~2008-06-02  2:16 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-05-30 17:40 Three strikes them out Lennart Borgman (gmail)
2008-05-31  4:48 ` Stefan Monnier
2008-05-31  9:01   ` Lennart Borgman (gmail)
2008-05-31  9:16     ` martin rudalics
2008-05-31  9:22       ` Lennart Borgman (gmail)
2008-05-31 10:24         ` martin rudalics
2008-05-31 11:58           ` Lennart Borgman (gmail)
2008-05-31 13:36             ` martin rudalics
2008-05-31 14:12               ` Lennart Borgman (gmail)
2008-05-31 22:49                 ` martin rudalics
2008-05-31 23:09                   ` Lennart Borgman (gmail)
2008-05-31 15:33               ` joakim
2008-05-31 22:59                 ` martin rudalics
2008-05-31 23:19                   ` Lennart Borgman (gmail)
2008-06-01  1:36                     ` Miles Bader
2008-06-01  8:24                       ` Lennart Borgman (gmail)
2008-06-01  8:45                     ` martin rudalics
2008-06-01 10:09                       ` Lennart Borgman (gmail)
2008-06-02  2:16         ` Stefan Monnier [this message]

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