[Twisted-Python] shared list in factory, mutexes?

[Itamar Shtull-Trauring]

On Mon, 2008-04-14 at 12:35 +0200, Gabriel Rossetti wrote:
> I'm wondering if maybe I'm misunderstanding something here, when several 
> messages arrive, what happens, are they processed in parallel, are they 
> put in a queue and processes sequentially? 

Sequentially. Twisted does not expose use of threads to user-level
APIs... and Twisted APIs are not thread-safe, other than
reactor.callFromThread.

> If I receive a message, do 
> some heavy processing/io/potentially blocking code in a thread using 
> twisted's threading module, and before it's done, I get another 
> connection + message that needs the same thing to be done, what
> happens? 

reactor.callInThread (and therefore deferToThread) are built on top of a
thread-safe Queue. Just make sure your scheduled tasks are not calling
back into Twisted but are rather self-contained units of work.