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	Wed, 09 Dec 2015 22:49:07 -0800 (PST)
Date:	Thu, 10 Dec 2015 07:49:02 +0100
From:	"Nicklas Karlsson (nicklas DOT karlsson17 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] gsch2pcb after refdes-renum? (If implemented
	syncronization detail)
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On Thu, 10 Dec 2015 02:12:15 +0100
"Peter Stuge (peter AT stuge DOT se) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:

> DJ Delorie wrote:
> > Forward annotation of every other attribute works just fine.  It's
> > changing the refdes that's a problem, because gaf treats the refdes
> > specially.
> 
> Is there still a problem if the cyclic U1->U2->U3->U1 rename is
> guaranteed to be atomic?
> 
> As in, it's not three rename operations, but a single rename
> operation with three affected elements?
> 
> 
> //Peter

Yes it should be atomic without stuck in the middle and executed exactly once and then everything would be fine.

If updates are stored in a file, I think the *.cmd file there just have to be some way to detect it have already been executed once before and everything would be fine. Execute the changes twice and refdes may be totally screwed up.

I guess one solution would be an attribute in *.pcb file to count every update in pcb. To write back information into a separate file have the small problem *.pcb and the separate file must both be written as an atomic operation.

Nicklas Karlsson

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