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List:       zope-dev
Subject:    Re: [Zope-dev] How is memory shared between Zope threads?
From:       Toby Dickenson <tdickenson () devmail ! geminidataloggers ! co ! uk>
Date:       2001-03-05 11:37:38
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On Fri, 2 Mar 2001 15:33:37 -0500 (EST), "R. David Murray "
<bitz@bitdance.com> wrote:

>On Fri, 2 Mar 2001, Erik Stephens wrote:
>> Thanks for the response.  If I understand you correctly, then as long =
a
>> thread does not try to modify an out-of-date object, it will not try =
to
>> re-read the most current version?  Is that the expected behaviour?
>
>Hmm.  Good question.  I seem to remember reading about cases where
>read-only transactions raised conflict errors in certain cases, but
>I'm not sure.  Hopefully someone from DC can chime in with a definitive
>answer.

The object cache only contains up-to-date objects when a transaction
starts.

ZODB will also raise a ConflictError when loading an object into the
cache for reading, if it has been modified since the start of the
transaction.

Toby Dickenson
tdickenson@geminidataloggers.com

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