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Issue 19158: a rare race in BoundedSemaphore could allow .release() too often.

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This commit is contained in:
Tim Peters 2013-10-08 21:12:58 -05:00
commit e99bdb9694
2 changed files with 23 additions and 3 deletions
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8
Lib/threading.py
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@ -289,9 +289,11 @@ class BoundedSemaphore(Semaphore):
self._initial_value = value
def release(self):
if self._value >= self._initial_value:
raise ValueError("Semaphore released too many times")
return Semaphore.release(self)
with self._cond:
if self._value >= self._initial_value:
raise ValueError("Semaphore released too many times")
self._value += 1
self._cond.notify()
class Event: