[mod_python] For what session locking is? Do i need it while using MySQL?

There has been discussion on MySQL implementation of Session  
functionality
on developers list recently. Go to:

   http://mail-archives.apache.org/mod_mbox/httpd-python-dev/ 
200608.mbox/thread

and read the posts about MySQLSession.

This probably will not answer all your questions, but then what you  
are actually
wanting to know isn't particularly clear.

Graham

On 10/08/2006, at 8:23 PM, Norman Tindall wrote:

> Hello,
>    Hmm. i can`t get session model in mod_python
> Is it something like a pool of session or a shared object? Is  
> potentialy any thread can
> access any session and they locked in a time while thread handles
> request?
>
>    I am writing a simple MySQL session module,
> in MySQL i can set SESS_ID solumn as UNIQUE and do something like this
>
> try:
>          c.execute("insert into sessions ...")
> except MySQLdb.IntegrityError:
>        #  here i catch duplicate entries
>
> Speed is a factor so.. what would be faster.. locking
> with _apache._global_lock(self._req.server, self._sid) OR
> MySQLdb.IntegrityError ??
>
> documentation has only one row about locking
> "When locking is on, only one session object with a particular  
> session id can be instantiated at a time."
>
> Could anyone give me a simple Entity Diagramm showing relations
> between  Session -  Apache threads - Random generators used in
> Sessions.py (they are also pooled for the numbers of MPM?)
> and also more detailed info of what happens when session lock aquired
>
> Sorry i am a newbie in multi-thread and this mutex crap :)
> Would be nice if anyone give me a link or a name of a good books in
> this theme.
>
> -- 
> Best regards,
>  Norman                          mailto:NormanTindall at zdisk.net
>
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