[Info-vax] C... the only winning move is not to play...

VAXman- at SendSpamHere.ORG VAXman- at SendSpamHere.ORG
Fri Feb 14 09:13:31 EST 2014


In article <52fd5211$0$7168$c3e8da3$76a7c58f at news.astraweb.com>, JF Mezei <jfmezei.spamnot at vaxination.ca> writes:
>On 14-02-13 13:50, VAXman- @SendSpamHere.ORG wrote:
>
>> I'm not going to disclose here how I get the "before image" but I assure you
>> it's not stale data in the user's buffers.
>
>I would be shocked if Mr VAXman dared lower himself to user mode to
>access a user buffer. He is far more likely to wedge himself between the
>XQP and RMS to capture those buffers :-)
>
>If 2 processes access the same RMS indexed file at same time, is it RMS
>that does the cache validatioN/updates when one process modifies
>something that is also contained in the other process' cache ? Or is
>that does at XQP level ?
>
>What happens when the 2 processes are on different nodes of a cluster ?
>Are are caches invalidated and at what level ?

If it's an RMS buffer, it's invalidated by RMS.  All managed with pointers
in the BDBs and GDBs with clusterwide maintenance compliments of the DLM.

-- 
VAXman- A Bored Certified VMS Kernel Mode Hacker    VAXman(at)TMESIS(dot)ORG

Well I speak to machines with the voice of humanity.



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