From: Paul Eggert <eggert@cs.ucla.edu>
To: Stefan Monnier <monnier@iro.umontreal.ca>, emacs-devel@gnu.org
Subject: Re: [Emacs-diffs] master 1392ec7 2/3: A quicker check for quit
Date: Wed, 1 Feb 2017 16:01:52 -0800 [thread overview]
Message-ID: <17190465-cc34-d24a-e281-8538127f88fe@cs.ucla.edu> (raw)
In-Reply-To: <jwvh94mvt66.fsf-monnier+emacsdiffs@gnu.org>
On 01/26/2017 05:40 AM, Stefan Monnier wrote:
> for circular lists a better solution is to use the hare&tortoise, e.g. with FOR_EACH_TAIL.
OK, after installing the patches that I circulated earlier, I submitted
bug reports containing two draft patches to use hare&tortoise and
FOR_EACH_TAIL instead of maybe_quit, when possible.
The patch in Bug#25605 improves FOR_EACH_TAIL to fix its FIXMEs and to
switch to Brent's teleporting-tortoise algorithm, which is faster than
Floyd's plodding tortoise.
The patch in Bug#25606 changes functions like 'length' and 'member' so
that they use FOR_EACH_TAIL to signal loop cycles, rather than wait for
the user to type C-g. Alternatively, functions like 'member' could
simply return nil when they discover a cycle; however, in practice I
think it's probably better to signal.
prev parent reply other threads:[~2017-02-02 0:01 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20170126052541.29089.5382@vcs.savannah.gnu.org>
[not found] ` <20170126052542.828422201BC@vcs.savannah.gnu.org>
2017-01-26 13:40 ` [Emacs-diffs] master 1392ec7 2/3: A quicker check for quit Stefan Monnier
2017-01-26 17:45 ` Paul Eggert
2017-01-26 20:02 ` Eli Zaretskii
2017-01-29 17:30 ` Eli Zaretskii
2017-01-29 17:47 ` Stefan Monnier
2017-01-29 20:16 ` Eli Zaretskii
2017-01-29 23:05 ` Paul Eggert
2017-01-30 15:33 ` Eli Zaretskii
2017-01-30 21:52 ` Paul Eggert
2017-01-31 15:48 ` Eli Zaretskii
2017-01-31 16:31 ` Stefan Monnier
2017-01-31 16:59 ` Paul Eggert
2017-02-02 0:01 ` Paul Eggert [this message]
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