[Python-Dev] Making Queue.Queue easier to use
jcarlson at uci.edu
Tue Oct 11 20:07:24 CEST 2005
Guido van Rossum <guido at python.org> wrote:
> > Optionally, the existing "put" and "get" methods could be deprecated, with the
> > goal of eventually changing their signature to match the put_wait and get_wait
> > methods above.
> Apart from trying to guess the API without reading the docs (:-), what
> are the use cases for using put/get with a timeout? I have a feeling
> it's not that common.
With timeout=0, a shared connection/resource pool (perhaps DB, etc., I
use one in the tuple space implementation I have for connections to the
tuple space). Note that technically speaking, Queue.Queue from Pythons
prior to 2.4 is broken: get_nowait() may not get an object even if the
Queue is full, this is caused by "elif not self.esema.acquire(0):" being
called for non-blocking requests. Tim did more than simplify the
structure by rewriting it, he fixed this bug.
With block=True, timeout=None, worker threads pulling from a work-to-do
queue, and even a thread which handles the output of those threads via
a result queue.
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