Paul> I'd like to have a function (or other callable object) that Paul> returns 0, 1, 2, etc. on repeated calls. ... Paul> There should never be any possibility of any number getting Paul> returned twice, or getting skipped over, even if f is being called Paul> from multiple threads.
How about (untested):
import Queue
counter = Queue.Queue() counter.put(0) def f(): i = counter.get()
I think you need:
i = counter.get(True)
for this to work; otherwise a race condition would raise an exception.
counter.put(i+1)
return i
[snip]
This is, of course dependent upon counter.get() being guaranteed to be thread safe. (I haven't found anything in the docs specifically relating to that. Perhaps it's implicit?)
Thanks, --ag
-- Artie Gold -- Austin, Texas http://it-matters.blogspot.com (new post 12/5) http://www.cafepress.com/goldsays -- http://mail.python.org/mailman/listinfo/python-list
