my threaded program hangs after calling Queue.join()

Kushal Kumaran kushal.kumaran+python at
Tue Apr 6 14:24:03 CEST 2010

On Tue, Apr 6, 2010 at 5:36 PM, Babu <babukk at> wrote:
> I am not an expert in python, so any help is my appreciated.  My
> threaded program consumed everything in the queue but is not
> exiting... What is the problem with this program?

See the example in the documentation of the queue module.  There must
be a call to task_done for every put.  You put the sentinel [None,
None] value, for which there will be no task_done call (because you
break out of the loop when you hit the sentinel).

> <snipped code>


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