Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.python > #65765

Re: system wide mutex

Path csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail
Return-Path <skip.montanaro@gmail.com>
X-Original-To python-list@python.org
Delivered-To python-list@mail.python.org
X-Spam-Status OK 0.011
X-Spam-Evidence '*H*': 0.98; '*S*': 0.00; '(at': 0.04; 'cc:addr :python-list': 0.11; 'blocks': 0.16; 'from:addr:pobox.com': 0.16; 'from:addr:skip': 0.16; 'roy': 0.16; 'prevent': 0.16; 'sender:addr:gmail.com': 0.17; 'wrote:': 0.18; 'file,': 0.19; 'feb': 0.22; 'cc:addr:python.org': 0.22; 'error': 0.23; 'skip': 0.24; 'file.': 0.24; 'cc:2**0': 0.24; 'right.': 0.26; 'second': 0.26; 'least': 0.26; 'header:In-Reply-To:1': 0.27; 'am,': 0.29; 'message-id:@mail.gmail.com': 0.30; 'flags': 0.31; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'first': 0.61; 'smith': 0.68; 'closes': 0.84; 'subject:system': 0.84
DKIM-Signature v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc:content-type; bh=CV6qTM0yvdoprzJkHSFGoOcm+2xjy0FVliRcfGOa2Zw=; b=Lfcpc6xJiKqBKjSWWw8zeryQh+JtDghBLVtB9JWlxJTIIjDngtEJsTS1epzUTw+KAm cEIfSeSO4wgEw9caZsmLQJeXdTVjoS9X909/zmon6knDxU+gI6zC72irRYJAK6t+tBA/ +Zu4ex5Rgh3XYpwqzfY+Asa1DL2ZL3a/hOMy3XGd18azx0gIT7/bP9939ZQOjGiTvR8i mw5w3idnYDRqxbdbYB4yfgUOYulShBNmZAMXd1wV+yFtA3laIJ7bHTm4S/fho4I/fE1x Ymu+cM8YM+r/eDr171yNRUslYNiMK1z+ZUmaoFIf+1uR1YU0WMTVKZrCpPwk0bOcTurX tN7w==
MIME-Version 1.0
X-Received by 10.58.133.15 with SMTP id oy15mr19117026veb.19.1391960400709; Sun, 09 Feb 2014 07:40:00 -0800 (PST)
Sender skip.montanaro@gmail.com
In-Reply-To <roy-960294.09455209022014@news.panix.com>
References <cf62da1e-45f0-4ace-924a-b3035063c71e@googlegroups.com> <mailman.6578.1391943647.18130.python-list@python.org> <roy-960294.09455209022014@news.panix.com>
Date Sun, 9 Feb 2014 09:40:00 -0600
X-Google-Sender-Auth 7eYHEp69dKlUQYflH-mfFUyEf3U
Subject Re: system wide mutex
From Skip Montanaro <skip@pobox.com>
To Roy Smith <roy@panix.com>
Content-Type text/plain; charset=UTF-8
Cc Python <python-list@python.org>
X-BeenThere python-list@python.org
X-Mailman-Version 2.1.15
Precedence list
List-Id General discussion list for the Python programming language <python-list.python.org>
List-Unsubscribe <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe>
List-Archive <http://mail.python.org/pipermail/python-list/>
List-Post <mailto:python-list@python.org>
List-Help <mailto:python-list-request@python.org?subject=help>
List-Subscribe <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe>
Newsgroups comp.lang.python
Message-ID <mailman.6591.1391960403.18130.python-list@python.org> (permalink)
Lines 10
NNTP-Posting-Host 2001:888:2000:d::a6
X-Trace 1391960403 news.xs4all.nl 2975 [2001:888:2000:d::a6]:58704
X-Complaints-To abuse@xs4all.nl
Xref csiph.com comp.lang.python:65765

Show key headers only | View raw

On Sun, Feb 9, 2014 at 8:45 AM, Roy Smith <roy@panix.com> wrote:
> This is true of all mutexes, no?

Hmmm... You might well be right. I thought that use of the O_EXLOCK
flag in the open(2) system call would prevent other processes from
opening the file, but (at least on my Mac) it just blocks until the
first process closes the file. Perhaps there are some other flags you
can use to cause the second open(2) call to error out.

Skip

Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

system wide mutex Asaf Las <roegltd@gmail.com> - 2014-02-09 02:39 -0800
  Re: system wide mutex Asaf Las <roegltd@gmail.com> - 2014-02-09 03:00 -0800
  Re: system wide mutex Skip Montanaro <skip@pobox.com> - 2014-02-09 05:00 -0600
    Re: system wide mutex Asaf Las <roegltd@gmail.com> - 2014-02-09 03:07 -0800
    Re: system wide mutex Roy Smith <roy@panix.com> - 2014-02-09 09:45 -0500
      Re: system wide mutex Skip Montanaro <skip@pobox.com> - 2014-02-09 09:40 -0600
      Re: system wide mutex Chris Angelico <rosuav@gmail.com> - 2014-02-10 09:09 +1100
  Re: system wide mutex Marko Rauhamaa <marko@pacujo.net> - 2014-02-09 18:14 +0200
    Re: system wide mutex Asaf Las <roegltd@gmail.com> - 2014-02-09 09:39 -0800
  Re: system wide mutex Grant Edwards <invalid@invalid.invalid> - 2014-02-10 17:00 +0000
  Re: system wide mutex Miki Tebeka <miki.tebeka@gmail.com> - 2014-02-10 09:46 -0800

csiph-web