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bpo-40221: Update multiprocessing to use _at_fork_reinit (GH-19511)

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Dong-hee Na 2020-04-15 01:35:36 +09:00 • committed by GitHub
parent e560f90602
commit a5900ecf9f
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2 changed files with 10 additions and 9 deletions
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13
Lib/multiprocessing/queues.py
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@ -49,8 +49,7 @@ def __init__(self, maxsize=0, *, ctx):
self._sem = ctx.BoundedSemaphore(maxsize)
# For use by concurrent.futures
self._ignore_epipe = False
self._after_fork()
self._reset()
if sys.platform != 'win32':
register_after_fork(self, Queue._after_fork)
@ -63,11 +62,17 @@ def __getstate__(self):
def __setstate__(self, state):
(self._ignore_epipe, self._maxsize, self._reader, self._writer,
self._rlock, self._wlock, self._sem, self._opid) = state
self._after_fork()
self._reset()
def _after_fork(self):
debug('Queue._after_fork()')
self._notempty = threading.Condition(threading.Lock())
self._reset(after_fork=True)
def _reset(self, after_fork=False):
if after_fork:
self._notempty._at_fork_reinit()
else:
self._notempty = threading.Condition(threading.Lock())
self._buffer = collections.deque()
self._thread = None
self._jointhread = None