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Groups > comp.lang.python > #81928

Re: time.monotonic() roll over

From Marko Rauhamaa <marko@pacujo.net>
Newsgroups comp.lang.python
Subject Re: time.monotonic() roll over
Date 2014-12-04 20:09 +0200
Organization A noiseless patient Spider
Message-ID <87ppbzp9qq.fsf@elektro.pacujo.net> (permalink)
References <54807cfd$0$2311$426a74cc@news.free.fr> <87vblr8lcw.fsf@elektro.pacujo.net> <mailman.16564.1417709156.18130.python-list@python.org> <87r3wf8jy8.fsf@elektro.pacujo.net> <mailman.16566.1417710430.18130.python-list@python.org>

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Chris Angelico <rosuav@gmail.com>:

> It's not a Python issue. Python can't do anything more than ask the
> system, and if the system's value rolls over several times a year,
> Python can't magically cure that. The information has already been
> lost.

Sure it could by having an invisible background thread occasionally call
time.monotonic(). It could even be done on the side without a thread.

Anyway, the idea of a clock is complicated:

 * the program could be stopped by a STOP signal

 * the program could be suspended from power management

 * the program could be resurrected from a virtual machine snapshot

 * the program could be migrated from a different physical machine

So, if I call

   time.sleep(86400)

and the program is suspended for 24 hours, should time.sleep() return
right after it is resumed or after another 24 hours?


Marko

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Thread

time.monotonic() roll over "ast" <nomail@invalid.com> - 2014-12-04 16:25 +0100
  Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-04 17:50 +0200
    Re: time.monotonic() roll over Ian Kelly <ian.g.kelly@gmail.com> - 2014-12-04 09:05 -0700
      Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-04 18:21 +0200
        Re: time.monotonic() roll over Chris Angelico <rosuav@gmail.com> - 2014-12-05 03:27 +1100
          Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-04 20:09 +0200
            Re: time.monotonic() roll over Chris Angelico <rosuav@gmail.com> - 2014-12-05 05:29 +1100
              Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-04 20:44 +0200
                Re: time.monotonic() roll over Chris Angelico <rosuav@gmail.com> - 2014-12-05 07:02 +1100
            Re: time.monotonic() roll over Ian Kelly <ian.g.kelly@gmail.com> - 2014-12-04 12:29 -0700
            Re: time.monotonic() roll over Akira Li <4kir4.1i@gmail.com> - 2014-12-04 23:24 +0300
            Re: time.monotonic() roll over Chris Angelico <rosuav@gmail.com> - 2014-12-05 07:33 +1100
              Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-04 22:51 +0200
            Re: time.monotonic() roll over Ian Kelly <ian.g.kelly@gmail.com> - 2014-12-04 15:17 -0700
              Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-05 00:44 +0200
                Re: time.monotonic() roll over Ian Kelly <ian.g.kelly@gmail.com> - 2014-12-05 10:04 -0700
                Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-05 20:48 +0200
            Re: time.monotonic() roll over Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-05 11:39 +1100
              Re: time.monotonic() roll over Dave Angel <davea@davea.name> - 2014-12-04 20:21 -0500
                Re: time.monotonic() roll over Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-05 13:54 +1100
                Re: time.monotonic() roll over Dave Angel <davea@davea.name> - 2014-12-05 00:29 -0500
                Re: time.monotonic() roll over Lele Gaifax <lele@metapensiero.it> - 2014-12-05 08:56 +0100
                Re: time.monotonic() roll over Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-12-05 21:09 +1100
                Re: time.monotonic() roll over Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-12-05 12:12 -0500
              Re: time.monotonic() roll over Marko Rauhamaa <marko@pacujo.net> - 2014-12-05 08:17 +0200
                Re: time.monotonic() roll over Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-12-05 12:31 -0500
              Re: time.monotonic() roll over Akira Li <4kir4.1i@gmail.com> - 2014-12-05 12:48 +0300
    Re: time.monotonic() roll over Chris Angelico <rosuav@gmail.com> - 2014-12-05 03:12 +1100
    Re: time.monotonic() roll over random832@fastmail.us - 2014-12-04 11:51 -0500
  Re: time.monotonic() roll over Nobody <nobody@nowhere.invalid> - 2014-12-05 00:54 +0000

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