[mod_python] Multiple processes/threads and dbms

Nick nick at dd.revealed.net
Wed Jun 15 22:30:21 EDT 2005

Duh, I'm showing my age... you want fcntl, not flock.


Nick wrote:
> Dan Eloff wrote:
>> But here's the problem. Some resources (files, dbms) are shared
>> between processes and threads, so how can you synchronize access to
>> them?
>> In the Session module which has a session implementation using a dbm,
>> _apache._global_lock and _apache._global_unlock is used.
> I tend to stay away from using apache's locks, since they are limited in 
> number and are used by apache and its modules.  I find flock works well 
> in these cases, as it is the usual way to deal with simultaneous access 
> to a dbm file from different processes.
> As an alternative, if you're only dealing with 1 server process (e.g. 
> apache2 on windows), python's threading module does a good enough job 
> (Lock/RLock objects).  I find python's native locking mechanisms 
> adequate for protecting the critical areas of my code across threads in 
> apache.
> Nick
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