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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"queue.Queue() is not reentrant, so signals and GC can cause deadlocks","articleBody":"BPO | [14976](https://bugs.python.org/issue14976)\n--- | :---\nNosy | @gvanrossum, @tim-one, @rhettinger, @gpshead, @ncoghlan, @pitrou, @serhiy-storchaka, @1st1, @applio\nPRs | \u003cli\u003epython/cpython#3346\u003c/li\u003e\nFiles | \u003cli\u003e[queue_deadlock.py](https://bugs.python.org/file25786/queue_deadlock.py \"Uploaded as text/plain at 2012-06-01.09:39:02 by JohanAR\"): signal hander reading/writing a queue\u003c/li\u003e\u003cli\u003e[queue_sendint.c](https://bugs.python.org/file25787/queue_sendint.c \"Uploaded as text/plain at 2012-06-01.09:40:01 by JohanAR\"): send 2 signals to specified process in rapid succession\u003c/li\u003e\u003cli\u003e[queuebug2.py](https://bugs.python.org/file46806/queuebug2.py \"Uploaded as text/plain at 2017-04-16.20:44:33 by itamarst\"): gc-based-queue-problem.py\u003c/li\u003e\u003cli\u003e[q_reentrancy.patch](https://bugs.python.org/file47092/q_reentrancy.patch \"Uploaded as text/plain at 2017-08-18.09:06:19 by @pitrou\")\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 2018-01-15.23:27:50.989\u003e\ncreated_at = \u003cDate 2012-06-01.08:43:03.911\u003e\nlabels = ['3.7', 'type-bug', 'library']\ntitle = 'queue.Queue() is not reentrant, so signals and GC can cause deadlocks'\nupdated_at = \u003cDate 2018-01-17.01:04:26.008\u003e\nuser = 'https://bugs.python.org/JohanAR'\n```\n\nbugs.python.org fields:\n```python\nactivity = \u003cDate 2018-01-17.01:04:26.008\u003e\nactor = 'gregory.p.smith'\nassignee = 'none'\nclosed = True\nclosed_date = \u003cDate 2018-01-15.23:27:50.989\u003e\ncloser = 'pitrou'\ncomponents = ['Library (Lib)']\ncreation = \u003cDate 2012-06-01.08:43:03.911\u003e\ncreator = 'JohanAR'\ndependencies = []\nfiles = ['25786', '25787', '46806', '47092']\nhgrepos = []\nissue_num = 14976\nkeywords = ['patch']\nmessage_count = 51.0\nmessages = ['162062', '162065', '162069', '162076', '211436', '275181', '275377', '275404', '275421', '275485', '291764', '300421', '300422', '300455', '300478', '300489', '300491', '300499', '300504', '300505', '300509', '300510', '300511', '300532', '300567', '300574', '300575', '300577', '300581', '300723', '300825', '301170', '301173', '301175', '301176', '301207', '301299', '301321', '301322', '301378', '301379', '301380', '301383', '301386', '301409', '310014', '310025', '310026', '310109', '310111', '310125']\nnosy_count = 15.0\nnosy_names = ['gvanrossum', 'tim.peters', 'rhettinger', 'gregory.p.smith', 'ncoghlan', 'pitrou', 'zzzeek', 'python-dev', 'sbt', 'serhiy.storchaka', 'JohanAR', 'yselivanov', 'itamarst', 'davin', 'Catalin Patulea']\npr_nums = ['3346']\npriority = 'normal'\nresolution = 'fixed'\nstage = 'resolved'\nstatus = 'closed'\nsuperseder = None\ntype = 'behavior'\nurl = 'https://bugs.python.org/issue14976'\nversions = ['Python 3.7']\n```\n\n\u003c/p\u003e\u003c/details\u003e\n","author":{"url":"https://github.com/JohanAR","@type":"Person","name":"JohanAR"},"datePublished":"2012-06-01T08:43:04.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":51},"url":"https://github.com/59181/cpython/issues/59181"}