En Fri, 16 Jan 2009 14:41:21 -0200, escribiste en el grupo gmane.comp.python.general
I ran a few tests on the new Python 2.6 multiprocessing module before migrating a threading code, and found out the locking code is not working well. In this case, a pool of 5 processes is running, each trying to get the lock and releasing it after waiting 0.2 seconds (action is repeated twice). It looks like the multiprocessing lock allows multiple locking after the second pass. Running the exact same code with threads works correctly.
I've tested your code on Windows and I think the problem is on the Queue class. If you replace the Queue with some print statements or write to a log file, the sequence lock/release is OK. You should file a bug report on http://bugs.python.org/ -- Gabriel Genellina -- http://mail.python.org/mailman/listinfo/python-list
