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From: Eli Zaretskii <eliz@gnu.org>
To: Paul Eggert <eggert@cs.ucla.edu>
Cc: manikulin@gmail.com, emacs-orgmode@gnu.org, 54764@debbugs.gnu.org
Subject: Re: bug#54764: encode-time: make DST and TIMEZONE fields of the list argument optional ones
Date: Wed, 20 Apr 2022 10:23:26 +0300	[thread overview]
Message-ID: <83fsm8tdzl.fsf@gnu.org> (raw)
In-Reply-To: <6efc5d24-34a2-fd30-cd20-fe4ac3e48310@cs.ucla.edu> (message from Paul Eggert on Tue, 19 Apr 2022 15:22:29 -0700)

> Date: Tue, 19 Apr 2022 15:22:29 -0700
> Cc: manikulin@gmail.com, emacs-orgmode@gnu.org, 54764@debbugs.gnu.org
> From: Paul Eggert <eggert@cs.ucla.edu>
> 
> On 4/18/22 22:50, Eli Zaretskii wrote:
> >> * admin/merge-gnulib (GNULIB_MODULES): Add gettime-res.
> >> * lib/gettime-res.c: New file, copied from Gnulib.
> >> * lib/gnulib.mk.in, m4/gnulib-comp.m4: Regenerate.
> > Is this known to support MS-Windows correctly?
> 
> I haven't tested it on that platform, though I expect it to work since 
> it relies only on current_timespec and Emacs already uses that.
> 
> I just now added some test cases to Gnulib for it; see the patch in the 
> first attachment. You can try these tests in your environment by running 
> './gnulib-tool --test gettime-res' in the Gnulib source directory. Or 
> you can save time by running './configure; make check' in the directory 
> represented by the second attachment, which is a compressed tarball 
> containing the output of './gnulib-tool --create-testdir --dir 
> test-gettime-res gettime-res'.

Thanks, the test-gettime-res test says "gettime_res returned 625000
ns", which is a strange number: it doesn't fit any MS-Windows system
time resolution figure I know about.  Do you happen to know what does
this number represent, and why it is the result of gettime-res.c when
it runs on MS-Windows?

AFAIK, the basic resolution of MS-Windows time stamps is 100 ns, so
using the above much larger number seems to hint at some significant
loss of information.  If the goal of this future changeset is to make
Emacs time stamps more fine-grained, it would be a shame not to have
the 100-ns resolution on MS-Windows.


  reply	other threads:[~2022-04-20  7:24 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-07 12:37 Max Nikulin
2022-04-09  7:52 ` Paul Eggert
2022-04-10  3:57   ` Max Nikulin
2022-04-13 14:40   ` Max Nikulin
2022-04-13 18:35     ` Paul Eggert
2022-04-14 13:19       ` Max Nikulin
2022-04-14 22:46         ` Paul Eggert
2022-04-15  2:14           ` Tim Cross
2022-04-15 17:23           ` Max Nikulin
2022-04-16 19:23             ` Paul Eggert
2022-04-21 16:59               ` Max Nikulin
2022-04-19  2:02             ` Paul Eggert
2022-04-19  5:50               ` Eli Zaretskii
2022-04-19 22:22                 ` Paul Eggert
2022-04-20  7:23                   ` Eli Zaretskii [this message]
2022-04-20 18:19                     ` Paul Eggert
2022-04-20 18:41                       ` Eli Zaretskii
2022-04-20 19:01                         ` Paul Eggert
2022-04-20 19:14                           ` Eli Zaretskii
2022-04-20 19:23                             ` Paul Eggert
2022-04-20 19:30                               ` Eli Zaretskii
2022-04-21  0:11                                 ` Paul Eggert
2022-04-21  6:44                                   ` Eli Zaretskii
2022-04-21 23:56                                     ` Paul Eggert
2022-04-22  5:01                                       ` Eli Zaretskii
2022-04-23 14:35                       ` Bernhard Voelker
2022-04-20 15:07               ` Max Nikulin
2022-04-20 18:29                 ` Paul Eggert
2022-04-25 15:30                   ` Max Nikulin
2022-04-25 15:37                     ` Paul Eggert
2022-04-25 19:49                       ` Paul Eggert
2022-04-30 11:22                         ` Max Nikulin
2022-05-01  2:32                           ` Paul Eggert
2022-05-01 17:15                             ` Max Nikulin
2022-04-13 15:12   ` Max Nikulin
2022-04-16 16:26   ` Max Nikulin
2022-04-17  1:58     ` Paul Eggert
2022-04-20 16:56       ` Max Nikulin
2022-04-20 19:17         ` Paul Eggert

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