From: Mike Fletcher <lemurific+rforum@...>
Date: 2006-08-30T05:45:03+09:00
Subject: Re: process based locks for files

Radu Spineanu wrote:
> Hi,
> 
> I have two programs accessing the same file. Both programs open and
> close the file multiple times while running (for example reading it
> first, and then writing it back using global functions).
> 
> In order to avoid race conditions i was wondering if it's possible to
> lock the file at the start of the running process and then unlock it at
> the end. During that time the running process should be able to open and
> close the file without problems.

There's File#flock, but keep in mind that flock is only an advisory lock 
(i.e. it only notifies cooperating processes that try and get a lock 
themselves) and is notoriously flakey on NFS mounts.

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