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Issue #14406: Fix a race condition when using concurrent.futures.wait(return_when=ALL_COMPLETED).

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Patch by Matt Joiner.
This commit is contained in:
Antoine Pitrou 2012-03-31 20:25:22 +02:00
commit 8b34b53c52
3 changed files with 25 additions and 4 deletions
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8
Lib/concurrent/futures/_base.py
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@ -111,12 +111,14 @@ class _AllCompletedWaiter(_Waiter):
def __init__(self, num_pending_calls, stop_on_exception):
self.num_pending_calls = num_pending_calls
self.stop_on_exception = stop_on_exception
self.lock = threading.Lock()
super().__init__()
def _decrement_pending_calls(self):
self.num_pending_calls -= 1
if not self.num_pending_calls:
self.event.set()
with self.lock:
self.num_pending_calls -= 1
if not self.num_pending_calls:
self.event.set()
def add_result(self, future):
super().add_result(future)