From: Glenn Morris <rgm@gnu.org>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: 12430@debbugs.gnu.org
Subject: bug#12430: Glitches caused by addition of psec to timers
Date: Thu, 13 Sep 2012 16:11:21 -0400 [thread overview]
Message-ID: <so627hhedy.fsf@fencepost.gnu.org> (raw)
In-Reply-To: <505235F3.3080909@cs.ucla.edu> (Paul Eggert's message of "Thu, 13 Sep 2012 12:37:23 -0700")
Paul Eggert wrote:
> I don't see how rounding errors could be avoided. As a trivial example, if I
> write '0.001' in Emacs Lisp, I get a number slightly bigger than 0.001
> due to rounding error, so the underlying OS primitives (which always
> get the ceiling of the delay request) would see two nanoseconds rather
> than the one that I wanted. OK, so it's only a nanosecond off, but
> the point is that Emacs shouldn't be munging the low-order
> bits of users' requests.
Maybe you should future-proof the timer format by jumping to units of
Planck time rather than picoseconds... I supposed you still need to
worry about portability between Universes though (please address in
Gnulib ASAP).
(I wonder when the first Emacs application will be written that has a
legitimate need to schedule a timer event with sub-millisecond
resolution.)
next prev parent reply other threads:[~2012-09-13 20:11 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-13 6:04 bug#12430: Glitches caused by addition of psec to timers Paul Eggert
2012-09-13 12:49 ` Stefan Monnier
2012-09-13 16:26 ` Paul Eggert
2012-09-13 16:57 ` Eli Zaretskii
2012-09-13 18:48 ` Paul Eggert
2012-09-13 19:19 ` Eli Zaretskii
2012-09-13 19:37 ` Paul Eggert
2012-09-13 20:11 ` Glenn Morris [this message]
2012-09-14 6:32 ` Eli Zaretskii
2012-09-13 21:35 ` Stefan Monnier
2012-09-14 6:32 ` Eli Zaretskii
2012-09-14 13:18 ` Stefan Monnier
2012-09-14 13:44 ` Eli Zaretskii
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