[Twisted-Python] deferToThread and thread pool

[Andrew Bennetts]

On Tue, Aug 30, 2005 at 09:17:10PM -0700, Brian Granger wrote:
> I have a few questions about the default implementation of  
> deferToThread.
> 
> 1.  Does deferToThread use a thread pool by default?  If not, how can  
> I enable this?

Yes.  You can adjust the threadpool size using
reactor.suggestThreadPoolSize:

    http://twistedmatrix.com/documents/current/api/twisted.internet.interfaces.IReactorThreads.html#suggestThreadPoolSize
    http://twistedmatrix.com/projects/core/documentation/howto/threading.html#auto4

> 2.  Which thread are the callbacks and errbacks of the deferred  
> returned by deferToThread run in?

The main thread, i.e. the reactor thread.

-Andrew.