From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: "Stuart D. Herring" Newsgroups: gmane.emacs.devel Subject: Re: A few questions about desktop.el Date: Fri, 28 Apr 2006 22:02:15 -0700 (PDT) Message-ID: <25425.128.165.0.81.1146286935.squirrel@webmail.lanl.gov> References: <58643.128.165.123.132.1146179153.squirrel@webmail.lanl.gov> Reply-To: herring@lanl.gov NNTP-Posting-Host: main.gmane.org Mime-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: sea.gmane.org 1146286964 31599 80.91.229.2 (29 Apr 2006 05:02:44 GMT) X-Complaints-To: usenet@sea.gmane.org NNTP-Posting-Date: Sat, 29 Apr 2006 05:02:44 +0000 (UTC) Cc: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Sat Apr 29 07:02:42 2006 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by ciao.gmane.org with esmtp (Exim 4.43) id 1FZhbL-0005zy-RW for ged-emacs-devel@m.gmane.org; Sat, 29 Apr 2006 07:02:40 +0200 Original-Received: from localhost ([127.0.0.1] helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1FZhbL-0007ZF-F7 for ged-emacs-devel@m.gmane.org; Sat, 29 Apr 2006 01:02:39 -0400 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1FZhb5-0007YL-Mo for emacs-devel@gnu.org; Sat, 29 Apr 2006 01:02:23 -0400 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1FZhb4-0007WZ-AC for emacs-devel@gnu.org; Sat, 29 Apr 2006 01:02:22 -0400 Original-Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1FZhb4-0007WK-1g for emacs-devel@gnu.org; Sat, 29 Apr 2006 01:02:22 -0400 Original-Received: from [192.65.95.54] (helo=mailwasher-b.lanl.gov) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA:32) (Exim 4.52) id 1FZheK-0006q2-PY; Sat, 29 Apr 2006 01:05:45 -0400 Original-Received: from mailrelay1.lanl.gov (mailrelay1.lanl.gov [128.165.4.101]) by mailwasher-b.lanl.gov (8.12.11.20060308/8.12.11/(ccn-5)) with ESMTP id k3T52HLU019884; Fri, 28 Apr 2006 23:02:17 -0600 Original-Received: from webmail1.lanl.gov (webmail1.lanl.gov [128.165.4.106]) by mailrelay1.lanl.gov (8.12.11.20060308/8.12.11/(ccn-5)) with ESMTP id k3T52FMD002787; Fri, 28 Apr 2006 23:02:16 -0600 Original-Received: from webmail1.lanl.gov (localhost.localdomain [127.0.0.1]) by webmail1.lanl.gov (8.12.11.20060308/8.12.11) with ESMTP id k3T52F4i029356; Fri, 28 Apr 2006 23:02:15 -0600 Original-Received: (from apache@localhost) by webmail1.lanl.gov (8.12.11.20060308/8.12.11/Submit) id k3T52F5H029354; Fri, 28 Apr 2006 22:02:15 -0700 X-Authentication-Warning: webmail1.lanl.gov: apache set sender to herring@lanl.gov using -f Original-Received: from 128.165.0.81 (SquirrelMail authenticated user 196434); by webmail.lanl.gov with HTTP; Fri, 28 Apr 2006 22:02:15 -0700 (PDT) In-Reply-To: Original-To: "Richard M. Stallman" User-Agent: SquirrelMail/1.4.3a-11.EL3 X-Mailer: SquirrelMail/1.4.3a-11.EL3 X-Priority: 3 (Normal) Importance: Normal X-PMX-Version: 4.7.1.128075 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:53582 Archived-At: > I think it is somewhat dangerous to modify the file when reading it. > My experience tells me that that can lead to various problems in weird > cases, and it is much better if operations that only look at data > are written so that they do not change anything. > > Can you use a different file name for the "in use" marker? I'm curious about your experience/worries -- the file is opened twice, so there's no seek issues, and the write is just an append. There's obvious race conditions, but I don't think they're important (as I said previously). And I was trying to avoid introducing another file for which one would have to check for conflicts and such. But I suppose there's no harm in having `desktop-lock-file-name', customizable but defaulted to ".emacs.desktop.lock" or so. It can hold the PID of the owner Emacs process. Speaking of which, is there a way to see from Lisp if an unrelated PID is running? Davis -- This product is sold by volume, not by mass. If it appears too dense or too sparse, it is because mass-energy conversion has occurred during shipping.