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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"join method of multiprocessing Pool object hangs if iterable argument of pool.map is empty","articleBody":"BPO | [12157](https://bugs.python.org/issue12157)\n--- | :---\nNosy | @terryjreedy, @vstinner, @akheron\nFiles | \u003cli\u003e[multi.py](https://bugs.python.org/file22077/multi.py \"Uploaded as text/plain at 2011-05-23.11:42:45 by gkcn\"): Code to reproduce the bug\u003c/li\u003e\u003cli\u003e[issue-12157.patch](https://bugs.python.org/file22466/issue-12157.patch \"Uploaded as text/plain at 2011-06-25.14:32:56 by mouad\"): Remove the MapResult instance from the Pool cache when the iterable passed to map is empty.\u003c/li\u003e\u003cli\u003e[issue-12157.patch](https://bugs.python.org/file22475/issue-12157.patch \"Uploaded as text/plain at 2011-06-25.16:46:42 by mouad\"): Don't Try to use any fancy way to check if the join will hang, leave all the job to faulthandler.\u003c/li\u003e\n\n\u003csup\u003e*Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.*\u003c/sup\u003e\n\n\u003cdetails\u003e\u003csummary\u003eShow more details\u003c/summary\u003e\u003cp\u003e\n\nGitHub fields:\n```python\nassignee = None\nclosed_at = \u003cDate 2012-06-07.22:18:20.103\u003e\ncreated_at = \u003cDate 2011-05-23.11:42:45.563\u003e\nlabels = ['type-bug', 'library']\ntitle = 'join method of multiprocessing Pool object hangs if iterable argument of pool.map is empty'\nupdated_at = \u003cDate 2012-06-07.22:18:20.102\u003e\nuser = 'https://bugs.python.org/gkcn'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2012-06-07.22:18:20.102\u003e\nactor = 'sbt'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2012-06-07.22:18:20.103\u003e\ncloser = 'sbt'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2011-05-23.11:42:45.563\u003e\ncreator = 'gkcn'\ndependencies = []\nfiles = ['22077', '22466', '22475']\nhgrepos = []\nissue_num = 12157\nkeywords = ['patch']\nmessage_count = 9.0\nmessages = ['136613', '137154', '137157', '139064', '139078', '139101', '139125', '139128', '162493']\nnosy_count = 10.0\nnosy_names = ['terry.reedy', 'vstinner', 'jnoller', 'neologix', 'rosslagerwall', 'python-dev', 'sbt', 'gkcn', 'mouad', 'petri.lehtinen']\npr_nums = []\npriority = 'normal'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue12157'\nversions = ['Python 2.7', 'Python 3.2', 'Python 3.3']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/gkcn","@type":"Person","name":"gkcn"},"datePublished":"2011-05-23T11:42:46.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":9},"url":"https://github.com/56366/cpython/issues/56366"}