[Python-Dev] threadsafe patch for asynchat

Josiah Carlson jcarlson at uci.edu
Wed Feb 8 08:57:00 CET 2006

"Fredrik Lundh" <fredrik at pythonware.com> wrote:
> Steve Holden wrote:
> > > What is the reason that people want to use threads when they can have
> > > poll/select-style message processing? Why does Zope require threads?
> > > IOW, why would anybody *want* a "threadsafe patch for asynchat"?
> > >
> > In case the processing of events needed to block? If I'm processing web
> > requests in an async* dispatch loop and a request needs the results of a
> > (probably lengthy) database query in order to generate its output, how
> > do I give the dispatcher control again to process the next asynchronous
> > network event?
> >
> > The usual answer is "process the request in a thread". That way the
> > dispatcher can spring to life for each event as quickly as needed.
> but why do such threads have to talk to asyncore directly ?

Indeed.  I seem to remember a discussion a few months ago about "easy"
thread programming, which invariably directed people off to use the
simplest abstractions necessary: Queues.

 - Josiah

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