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Re: Rename atomicity

From: Larry Jones
Subject: Re: Rename atomicity
Date: Wed, 11 Apr 2001 10:54:17 -0400 (EDT)

Derek R. Price writes:
> What of the case where a file is being written while a read-only CVS attempts
> to read it.  Providing RCS doesn't consistently break, and I'm far from sure
> it will, the resulting partial file in the sandbox will have valid metadata.
> If the file was touched in the sandbox, a later commit could check in
> garbage.

That can't happen.  When rewriting foo,v, both CVS and RCS actually
write a new file named ,foo, and only rename it to foo,v once it's been
completely written successfully.  If the rename happens while a reader
has the file open, it will continue to read the original file (which
will be deleted once the reader closes it).

-Larry Jones

There's a connection here, I just know it. -- Calvin

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