Re: ERXEC and locking

>From some experimentation it looks like that even in Session.terminate
locks are automagically generated even without explicit lock/unlock.

Any thoughts?


Matteo

On Tue, Jul 10, 2012 at 9:33 AM, Cheong Hee (Gmail) <[email protected]>wrote:

> **
> I think you are right or at least this is the impression I had the last
> time on this subject.   I plan to move from MultiEC locking manager to
> ERXEC ec.  As usual, I could be wrong..
>
>
> ----- Original Message -----
> *From:* Matteo Centro <[email protected]>
> *To:* Paul Dunkler <[email protected]>
> *Cc:* [email protected] Dev Apple<[email protected]+Dev+Apple>; Wonder
> Project <[email protected]>
> *Sent:* Monday, July 09, 2012 6:47 PM
> *Subject:* Re: [Wonder-disc] ERXEC and locking
>
> Actually I noticed that removing all the locks (even the forgotten ones)
> seems to have solved the problem... I had 100000 unique users on 22
> instances running  for a day and no deadlocks.
>
> Any thoughts about stuff that is done in the Session.terminate? I need to
> do some cleanup if the session terminates, do I get automatic lock unlock
> in that scenario or the termination happens in a separate thread and so I
> have to manually lock/unlock?
>
> Thanks,
>
>
> Matteo
>
> On Mon, Jul 9, 2012 at 12:19 PM, Paul Dunkler <[email protected]>wrote:
>
>>   I recently "Wonderized" a legacy WO application and I have a strange
>> race condition that happens very rarely and only under extremely high load.
>> Application extends ERXApplication, Session extends ERXSession and so on,
>> I removed all "new EOEditingContext()" and replaced them with
>> ERXEC.newEditingContext()
>> but
>> I forgot to remove some ec.lock() and ec.unlock()
>>
>> I am quite convinced that removing all locks and unlocks will bring me to
>> a non deadlocking situation but I still want some reassurements
>> I read a lot of stuff and I'm here to ask to you gurus a final word on
>> the locking rule I inferred from what I read:
>>
>> If you always use ERXEC you can safely remove all lock and unlocks except
>> for stuff that happen in background threads...
>>
>>
>> Is it true?
>>
>>
>> I think yes, its true. We are actually using Wonder Editing Contexts only
>> and do not have any other locking stuff. Everything runs fine.
>>
>>
>> What about stuff that happens in session.terminate()? I would say that it
>> should have explicit lock/unlocks but any opinions are welcome.
>>
>> Thanks,
>>
>>
>> Matteo
>>
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>>  --
>> Mit freundlichen Grüßen
>>
>> Paul Dunkler
>>
>>
>>
>>
>>
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