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From: Paul Eggert <eggert@cs.ucla.edu>
To: Stefan Monnier <monnier@iro.umontreal.ca>
Cc: Mark Barton <mbarton98@gmail.com>,
	emacs-orgmode <emacs-orgmode@gnu.org>,
	emacs-devel@gnu.org
Subject: Re: master 4a1f69ebca 2/2: Use (TICKS . HZ) for current-time etc.
Date: Thu, 28 Apr 2022 15:27:52 -0700	[thread overview]
Message-ID: <d6487bef-b5bb-ca80-5746-3a5e6626cafc@cs.ucla.edu> (raw)
In-Reply-To: <jwvilqu1n7m.fsf-monnier+emacs@gnu.org>

On 4/27/22 09:55, Stefan Monnier wrote:
> Instead of rounding the times to whole seconds, wouldn't it make more
> sense to check that the difference is larger than 1s?

org-file-newer-than-p is intended to work on filesystems like HFS+ that 
store just the seconds part of the last-modified time. Since these 
filesystems take the floor of the system time, taking the floor should 
be the most-accurate way to work around timestamp truncation issues, 
where comparing one timestamp that comes from an HFS+ filesystem to 
another timestamp coming from some other source (which is how 
org-file-newer-than-p is used).

The code won't work as desired on filesystems like FAT where the 
last-modified time has only 2-second resolution. Ideally Emacs Lisp code 
would have access to file timestamp resolution but that's not something 
it has now, so I merely preserved org-file-newer-than-p's assumption 
that taking the floor is good enough.


  reply	other threads:[~2022-04-28 22:28 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-04-27  6:37 master 4a1f69ebca 2/2: Use (TICKS . HZ) for current-time etc Mark Barton
2022-04-27  7:20 ` Po Lu
2022-04-27  7:39 ` Paul Eggert
2022-04-27 16:55   ` Stefan Monnier
2022-04-28 22:27     ` Paul Eggert [this message]
2022-04-29 14:22       ` Max Nikulin
2022-04-29 18:10         ` Paul Eggert
2022-04-30 10:56           ` Max Nikulin
2022-05-06 16:56             ` [PATCH] org-macs.el: Do not compare wall time and file modification time Max Nikulin
2022-05-11 12:28               ` Max Nikulin
2022-05-11 16:24                 ` Paul Eggert
2022-05-12 16:55                   ` Max Nikulin
2022-05-12 22:52                     ` Paul Eggert
2022-05-13 12:28                       ` Max Nikulin
2022-05-13 18:00                         ` Paul Eggert
2022-10-02  3:49                     ` Ihor Radchenko
2022-10-09  8:18                       ` [PATCH v2] " Max Nikulin
2022-10-21  3:27                         ` Ihor Radchenko

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