Problem with queue.join() hang/deadlock when using threading but only with python 2.7.2 on oneiric

Asked by Lars Nordin on 2012-06-13

I have a problem using queue.join() that causes my threaded script to deadlock.

The script is based off of the example code in http://stackoverflow.com/a/317172/570450. The only differences is that the main thread fills the job queue first then spawns threads (afterwards calls queue.join() - as in the example program).

This program ran/runs without issue for over a hundred times with python v2.6.6 on Ubuntu v10.10 (recently upgraded to Ubuntu v11.10).

The program seems stable on Ubuntu v11.10 but only when using python v2.6.7 (python2.6 pkg: 2.6.7-4ubuntu1)

Python v2.7 info:
python -V: Python 2.7.2+
Ubuntu package: python 2.7.2-7ubuntu2

Question information

Lars Nordin (lnordin) said : #1

Addition: another difference with the example program is that my version does a non-blocking fetch from the queue ("queue.get(False)") and the Queue.empty exception is caught.

Anyway, as I said before the script runs fine on python v2.6

Can you help with this problem?

Provide an answer of your own, or ask Lars Nordin for more information if necessary.

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