like i said, we sync on pagemap not session. so if you use frames there is a
chance two requests for the same session will be processed simultaneously.

-igor


On 4/1/07, Jonathan Locke <[EMAIL PROTECTED]> wrote:



i'm missing something here still.  what thread other than the request
thread
will ever be accessing this?


igor.vaynberg wrote:
>
> copy on write has the advantage when it comes to iterating over the
list.
> the locking needs to be there because we lock on pagemaps and not on
> session, so two pages in different pagemaps would need to be synced.
>
> -igor
>
>
> On 3/31/07, Eelco Hillenius <[EMAIL PROTECTED]> wrote:
>>
>> > Yeah, that does sound like overkill in a single-threaded environment.
>> > What other thread would ever be accessing a session's feedback
>> messages?
>>
>> Furthermore, copy on write is efficient when there are lots of reads
>> and just a couple of writes, but that's not the case I think. So
>> normal synchronization would almost certain be more efficient here.
>>
>> Eelco
>>
>>
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