New submission from Sultan Qasim: This issue seems to be new in Python 3.3.1. This worked fine in Python 3.3.0 and earlier. I am using fully up-to-date installation of Arch Linux, running the official arch repo's 64 bit build of Python 3.3.1. This issue is probably a result of the changes to multiprocessing's pipes brought about in solutions to issues #10527 or #16955.
The multiprocessing Queue's get() method on Python 3.3.1 does not block on Linux when a timeout of 1 second or less is specified. I have not tested this on Windows or Mac OS X. Example Code: from multiprocessing import Queue q = Queue() q.get(True, 0.5) # Expected result: block for half a second before throwing exception # Actual result: throws empty exception immediately without waiting q.get(True, 1) # Expected result: block for one second before throwing exception # Actual result: throws empty exception immediately without waiting q.get(True, 1.00001) # Expected result: block for just over a second before throwing exception # Actual result: throws empty exception immediately without waiting q.get(True, 1.00002) # Blocks for just over a second, as expected q.get(True, 2) # Blocks for two seconds, as expected ---------- components: Library (Lib) messages: 186687 nosy: sultanqasim priority: normal severity: normal status: open title: Multiprocessing queue get method does not block for short timeouts versions: Python 3.3 _______________________________________ Python tracker <rep...@bugs.python.org> <http://bugs.python.org/issue17707> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: http://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
