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Added new BoundedSemaphore class. Closes bug 452836.

This commit is contained in:
Skip Montanaro 2001-08-20 20:27:58 +00:00
parent a7fc21baf6
commit e428bb7030
1 changed files with 15 additions and 0 deletions
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15
Lib/threading.py
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@ -284,6 +284,21 @@ class _Semaphore(_Verbose):
self.__cond.release()
def BoundedSemaphore(*args, **kwargs):
return apply(_BoundedSemaphore, args, kwargs)
class _BoundedSemaphore(_Semaphore):
"""Semaphore that checks that # releases is <= # acquires"""
def __init__(self, value=1, verbose=None):
_Semaphore.__init__(self, value, verbose)
self._initial_value = value
def release(self):
if self._Semaphore__value >= self._initial_value:
raise ValueError, "Semaphore released too many times"
return _Semaphore.release(self)
def Event(*args, **kwargs):
return apply(_Event, args, kwargs)