Re: Help with TCB status
- From: bdissen@xxxxxxxxxxxx (Binyamin Dissen)
- Date: 6 Jul 2006 12:59:29 -0700
On Thu, 6 Jul 2006 14:57:32 -0400 "Craddock, Chris" <Chris.Craddock@xxxxxx>
wrote:
:>Ed (and Jeff Smith) asked
:>> Are you sure PLO can be used this way? Will the "compare" portion work
:>> against arbitrary values not serialized/updated using PLO?
:>Well now that you mention it, I'm NOT sure. The compare and load
:>functions are supposed to be for following chains that can change while
:>you're looking at them. I had a conversation about PLO with Bob Rogers a
:>long time ago and came away with the impression that the operands were
:>fetched (in the normal way) -before- the comparison was made, so if you
:>got CC=0 then, at least in the compare and load case, you had a
:>point-in-time consistent view which is all that I wanted. I haven't
:>actually used this "trick" anywhere and since it might not actually work
:>the way I thought, I won't use it. I can't blame Bob because I was
:>probably reading between the lines of what he said anyway.
My understanding of PLO is that it only serializes with the specified lock
number/address.
--
Binyamin Dissen <bdissen@xxxxxxxxxxxxxxxxxx>
http://www.dissensoftware.com
Director, Dissen Software, Bar & Grill - Israel
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