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Re: [Nmh-workers] Locking (specifically, sequences)

From: David Levine
Subject: Re: [Nmh-workers] Locking (specifically, sequences)
Date: Sat, 09 Mar 2013 09:32:54 -0500

Ken wrote:

> >>   So it probably makes sense to there to call seq_read() to read/lock
> >>   the sequence file after all the messages are searched; that will
> >>   reload any changes to the sequence file & write-lock it.
> >
> >What happens if there were changes to the sequence file,
> >esp. some that invalidate the (potentially long) operation
> >that had just been completed?
> I'm trying to imagine how that would work.  Programs like "pick" and
> "inc" just add sequences to the the sequence file.  So what could
> be happening that would invalidate what they do?

* a "show" that removed a message from the unseen sequence
* a "mark" that removed anything from any sequence that they use
* a "refile" that made a heckuva mess


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