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bpo-40221: Update multiprocessing to use _at_fork_reinit #19511

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Merged
corona10 merged 2 commits into from
Apr 14, 2020
Merged

bpo-40221: Update multiprocessing to use _at_fork_reinit #19511

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7121b4a
bpo-40221: Update multiprocessing to use _at_fork_reinit
corona10 Apr 14, 2020
fe3f6e3
bpo-40221: Apply code review
corona10 Apr 14, 2020
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bpo-40221: Apply code review
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@corona10
corona10 committed Apr 14, 2020
commit fe3f6e3e7021701e0349b85aa47b5ba14a74a2d6
11 changes: 6 additions & 5 deletions Lib/multiprocessing/queues.py
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Original file line number Diff line number Diff line change
Expand Up @@ -49,7 +49,6 @@ def __init__(self, maxsize=0, *, ctx):
self._sem = ctx.BoundedSemaphore(maxsize)
# For use by concurrent.futures
self._ignore_epipe = False
self._notempty = threading.Condition(threading.Lock())
self._reset()

if sys.platform != 'win32':
Expand All @@ -63,15 +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._notempty = threading.Condition(threading.Lock())
self._reset()

def _after_fork(self):
debug('Queue._after_fork()')
self._notempty._at_fork_reinit()
self._reset()
self._reset(after_fork=True)

def _reset(self):
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
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