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RE: [RFC] Conceptual locking procedure for database access [#11511]

From: Oliver Klozoff <stevieoh_at_fastmail.fm>
Date: 2004-12-23 17:14:22 CET

> Like this:
> For every process ID slot {
> if we dont' have a slot yet and the slot is empty {
   -> We are preempted
   -> Another process gets to this point, locks slot,
      marks slot as non-empty
> Acquire lock on the process slot (NOWAIT)
   -> Slot is locked by other process; acquire fails
> if acquire was successful {
> Overwrite the slot with our process ID
> we have a slot now
> }
> if acquire failed {
> ERROR; this can't happen
   -> Oops, it just did
> }
> }
> I think this covers all cases, and it guarantees that we
> can't have a slot that's marked as empty and is locked at the
> same time. That's a good sanity check, IMO.

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Received on Thu Dec 23 17:15:45 2004

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