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Re: How to safely maintain a status file

References (7 earlier) <mailman.2059.1342118365.4697.python-list@python.org> <fd846619-7de7-4c3b-8ed6-a14e9d55956e@p6g2000yqg.googlegroups.com> <mailman.2061.1342145524.4697.python-list@python.org> <4fff926b$0$29965$c3e8da3$5496439d@news.astraweb.com> <62e90523-a160-4e28-8109-9ce32d8952e1@googlegroups.com>
Date 2012-07-13 16:02 +1000
Subject Re: How to safely maintain a status file
From Chris Angelico <rosuav@gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.2064.1342159337.4697.python-list@python.org> (permalink)

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On Fri, Jul 13, 2012 at 2:26 PM,  <rantingrickjohnson@gmail.com> wrote:
> On Thursday, July 12, 2012 10:13:47 PM UTC-5, Steven D&#39;Aprano wrote:
>> Rick has obviously never tried to open a file for reading when somebody
>> else has it opened, also for reading, and discovered that despite Windows
>> being allegedly a multi-user operating system, you can&#39;t actually have
>> multiple users read the same files at the same time.
>
> You misread my response. My comment was direct result of Christian stating:
>
> (paraphrase) "On some systems you are not permitted to delete a file whilst the file is open "
>
> ...which seems to be consistent to me. Why would *anybody* want to delete a file whilst the file is open?

POSIX doesn't let you delete files. It lets you dispose of filenames.
Python does the same with its 'del'. The object (file) exists until
the system decides otherwise.

Here's a simpler example: Hardlinks. Suppose you have two names
pointing to the same file; are you allowed to unlink one of them while
you have the "other" open?

ChrisA

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Re: How to safely maintain a status file Laszlo Nagy <gandalf@shopzeus.com> - 2012-07-12 14:30 +0200
  Re: How to safely maintain a status file Hans Mulder <hansmu@xs4all.nl> - 2012-07-12 15:19 +0200
    Re: How to safely maintain a status file Laszlo Nagy <gandalf@shopzeus.com> - 2012-07-12 19:43 +0200
    Re: How to safely maintain a status file Christian Heimes <lists@cheimes.de> - 2012-07-12 20:39 +0200
      Re: How to safely maintain a status file Rick Johnson <rantingrickjohnson@gmail.com> - 2012-07-12 18:20 -0700
        Re: How to safely maintain a status file Chris Angelico <rosuav@gmail.com> - 2012-07-13 12:12 +1000
          Re: How to safely maintain a status file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-13 03:13 +0000
            Re: How to safely maintain a status file Gene Heskett <gheskett@wdtv.com> - 2012-07-12 23:49 -0400
              Re: How to safely maintain a status file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-13 04:21 +0000
            Re: How to safely maintain a status file rantingrickjohnson@gmail.com - 2012-07-12 21:26 -0700
              Re: How to safely maintain a status file Chris Angelico <rosuav@gmail.com> - 2012-07-13 16:02 +1000
              Re: How to safely maintain a status file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-13 07:14 +0000
                Re: How to safely maintain a status file Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2012-07-13 13:29 -0400
              RE: How to safely maintain a status file "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-07-13 16:00 +0000
              Re: [Python] RE: How to safely maintain a status file Chris Gonnerman <chris@gonnerman.org> - 2012-07-13 12:27 -0500
              RE: [Python] RE: How to safely maintain a status file "Prasad, Ramit" <ramit.prasad@jpmorgan.com> - 2012-07-13 17:59 +0000
                Re: [Python] RE: How to safely maintain a status file Hans Mulder <hansmu@xs4all.nl> - 2012-07-13 20:28 +0200
                Re: [Python] RE: How to safely maintain a status file MRAB <python@mrabarnett.plus.com> - 2012-07-13 20:57 +0100
                Re: [Python] RE: How to safely maintain a status file Christian Heimes <lists@cheimes.de> - 2012-07-13 22:21 +0200
              Re: [Python] RE: How to safely maintain a status file Chris Angelico <rosuav@gmail.com> - 2012-07-14 04:19 +1000
              RE: How to safely maintain a status file Chris Gonnerman <chris@gonnerman.org> - 2012-07-13 15:15 -0500
                Re: How to safely maintain a status file Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2012-07-14 01:53 +0000

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