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bpo-22087: Fix Policy.get_event_loop() to detect fork (GH-7208)

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Original patch by Dan O'Reilly.
This commit is contained in:
Yury Selivanov 2018-05-29 15:38:07 -04:00 • committed by GitHub
parent e55de2d77f
commit 5d97b7bcc1
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7
Lib/asyncio/events.py
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@ -625,16 +625,23 @@ class BaseDefaultEventLoopPolicy(AbstractEventLoopPolicy):
class _Local(threading.local):
_loop = None
_pid = None
_set_called = False
def __init__(self):
self._local = self._Local()
self._local._pid = os.getpid()
def get_event_loop(self):
"""Get the event loop.
This may be None or an instance of EventLoop.
"""
if self._local._pid != os.getpid():
# If we detect we're in a child process forked by multiprocessing,
# we reset self._local so that we'll get a new event loop.
self._local = self._Local()
if (self._local._loop is None and
not self._local._set_called and
isinstance(threading.current_thread(), threading._MainThread)):