* bug#12802: 23.4; feature wish: file-attributes in microsecond precision
@ 2012-11-04 22:18 Hendrik Tews
2012-11-05 2:59 ` Glenn Morris
2012-11-05 3:40 ` Stefan Monnier
0 siblings, 2 replies; 5+ messages in thread
From: Hendrik Tews @ 2012-11-04 22:18 UTC (permalink / raw)
To: 12802
Hi,
please make file access/modification/status change times
available in microsecond precision on those systems that support
that.
Motivation: I am maintaining an extension of Proof General that
compiles Coq source files to Coq object files on the fly when
needed. For that I have to compare file modification times in a
way similar to make. I would really like to do this with a
precision better than 1 second.
Thanks in advance,
Hendrik Tews
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#12802: 23.4; feature wish: file-attributes in microsecond precision
2012-11-04 22:18 bug#12802: 23.4; feature wish: file-attributes in microsecond precision Hendrik Tews
@ 2012-11-05 2:59 ` Glenn Morris
2012-11-05 3:40 ` Stefan Monnier
1 sibling, 0 replies; 5+ messages in thread
From: Glenn Morris @ 2012-11-05 2:59 UTC (permalink / raw)
To: 12802-done
Version: 24.3
Hendrik Tews wrote:
> please make file access/modification/status change times
> available in microsecond precision on those systems that support
> that.
I believe this is already (more than) implemented and should appear in
24.3. From the NEWS file:
*** `current-time' now returns extended-format time stamps (HIGH
LOW USEC PSEC), where the new PSEC slot specifies picoseconds. PSEC
is typically a multiple of 1000 on current machines. Other
functions that use this format, such as file-attributes and
format-time-string, have been changed accordingly.
^ permalink raw reply [flat|nested] 5+ messages in thread* bug#12802: 23.4; feature wish: file-attributes in microsecond precision
2012-11-04 22:18 bug#12802: 23.4; feature wish: file-attributes in microsecond precision Hendrik Tews
2012-11-05 2:59 ` Glenn Morris
@ 2012-11-05 3:40 ` Stefan Monnier
2012-11-05 16:02 ` Eli Zaretskii
1 sibling, 1 reply; 5+ messages in thread
From: Stefan Monnier @ 2012-11-05 3:40 UTC (permalink / raw)
To: Hendrik Tews; +Cc: 12802
> please make file access/modification/status change times available in
> microsecond precision on those systems that support that.
Your wish has been granted.
> Motivation: I am maintaining an extension of Proof General that
> compiles Coq source files to Coq object files on the fly when
> needed. For that I have to compare file modification times in a
> way similar to make.
AFAIK `make' does not require such fine-precision. Basically if the
time-stamp on the generated file is equal to the source, then it's
considered as new enough (IOW in the absence of a proof that the
generated file is older, it is assumed to be newer).
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread* bug#12802: 23.4; feature wish: file-attributes in microsecond precision
2012-11-05 3:40 ` Stefan Monnier
@ 2012-11-05 16:02 ` Eli Zaretskii
2012-11-05 23:43 ` Stefan Monnier
0 siblings, 1 reply; 5+ messages in thread
From: Eli Zaretskii @ 2012-11-05 16:02 UTC (permalink / raw)
To: Stefan Monnier; +Cc: hendrik, 12802
> From: Stefan Monnier <monnier@IRO.UMontreal.CA>
> Date: Sun, 04 Nov 2012 22:40:52 -0500
> Cc: 12802@debbugs.gnu.org
>
> > Motivation: I am maintaining an extension of Proof General that
> > compiles Coq source files to Coq object files on the fly when
> > needed. For that I have to compare file modification times in a
> > way similar to make.
>
> AFAIK `make' does not require such fine-precision.
GNU Make supports nanosecond time resolution when the underlying
library provides that.
^ permalink raw reply [flat|nested] 5+ messages in thread
* bug#12802: 23.4; feature wish: file-attributes in microsecond precision
2012-11-05 16:02 ` Eli Zaretskii
@ 2012-11-05 23:43 ` Stefan Monnier
0 siblings, 0 replies; 5+ messages in thread
From: Stefan Monnier @ 2012-11-05 23:43 UTC (permalink / raw)
To: Eli Zaretskii; +Cc: hendrik, 12802
>> AFAIK `make' does not require such fine-precision.
> GNU Make supports nanosecond time resolution when the underlying
> library provides that.
Yes, it supports it when it's available (which doesn't just depend
on the library but also the filesystem). But that still a far cry from
requiring it ;-)
Stefan
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2012-11-05 23:43 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz follow: Atom feed
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2012-11-04 22:18 bug#12802: 23.4; feature wish: file-attributes in microsecond precision Hendrik Tews
2012-11-05 2:59 ` Glenn Morris
2012-11-05 3:40 ` Stefan Monnier
2012-11-05 16:02 ` Eli Zaretskii
2012-11-05 23:43 ` Stefan Monnier
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