[Python-Dev] threadsafe patch for asynchat (original) (raw)

Steve Holden steve at holdenweb.com
Wed Feb 8 13:25:35 CET 2006

Josiah Carlson wrote:

"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 ? Good question. 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. Maybe people are finding Python too easy and they just want to complicate their code to the point where it contains interesting bugs? I dunno ....

regards Steve

Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC www.holdenweb.com PyCon TX 2006 www.python.org/pycon/

More information about the Python-Dev mailing list