From: Brian Candler <b.candler@...>
Date: 2010-08-26T22:59:54+09:00
Subject: Re: Lock file while copying

aidy wrote:
> Is it possible during File.copy to lock that file from any other
> process?

Not normally - unless your operating system supports Mandatory File 
Locking and has it enabled.

Most OSes use Advisory File Locking, which means that a lock can be 
made, but it's up to the other process to try to lock the file itself 
before updating it. It could simply not bother and go ahead with the 
update anyway.
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