New submission from eshkrig <eshk...@gmail.com>:
Hi! I found a bug in the multiprocessing module. The documentation (https://docs.python.org/3.6/library/multiprocessing.html) for the Queue.get method says: "If timeout is a positive number, it blocks at most timeout seconds ..." But the Queue.get method freezes if the process filling the queue terminates while reading data. In the attachment is an example of a program (testqueue.py) that freezes after ~ 5-30 seconds. After pressing <control>-<c>, the output is as follows: Traceback (most recent call last): File "./testqueue.py", line 45, in <module> result = ps_queues[cpu].get(timeout=2) File "/usr/lib64/python3.6/multiprocessing/queues.py", line 108, in get res = self._recv_bytes() File "/usr/lib64/python3.6/multiprocessing/connection.py", line 216, in recv_bytes buf = self._recv_bytes(maxlength) File "/usr/lib64/python3.6/multiprocessing/connection.py", line 411, in _recv_bytes return self._recv(size) File "/usr/lib64/python3.6/multiprocessing/connection.py", line 379, in _recv chunk = read(handle, remaining) KeyboardInterrupt Please fix it. ---------- components: Extension Modules files: testqueue.py messages: 352613 nosy: eshkrig priority: normal severity: normal status: open title: A bug in the multiprocessing module type: behavior versions: Python 3.6 Added file: https://bugs.python.org/file48609/testqueue.py _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue38195> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
