[Python-checkins] CVS: python/dist/src/Lib threading.py,1.16,1.17

[Skip Montanaro]

Update of /cvsroot/python/python/dist/src/Lib
In directory usw-pr-cvs1:/tmp/cvs-serv5936

Modified Files:
	threading.py 
Log Message:
Added new BoundedSemaphore class.  Closes bug 452836.


Index: threading.py
===================================================================
RCS file: /cvsroot/python/python/dist/src/Lib/threading.py,v
retrieving revision 1.16
retrieving revision 1.17
diff -C2 -d -r1.16 -r1.17
*** threading.py	2001/08/19 05:53:47	1.16
--- threading.py	2001/08/20 20:27:58	1.17
***************
*** 285,288 ****
--- 285,303 ----
  
  
+ 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)