Re: Elektrified X.org released (was: X configuration paradigm, and a proposal)

["Neal D. Becker" <ndbecker2 verizon net>]

Sean Middleditch wrote:

[...]
> So far as implementation, this really is easy even with a (single) file-
> based backend.  Robustness might take some work, but the basics are
> easy.  You simply keep a list of all they keys that have been set, and
> when the Commit command comes along, lock the file(s) in question and
> modify them.  On Rollback, just "forget" all the key changes that
> haven't been committed yet.  Basically the hard part for the simple file
> backend is getting the commit to stay atomic on errors when you use
> multiple files.  If you have multiple files being changed, I don't
> believe it's actually possible to be 100% atomic - you can reduce the
> chances of something breaking, but there will always be various race
> conditions in regards to when errors occur that could leave you in a
> half-committed state.
> 

rename is atomic.  You can always use this fact if you need to.