Carl Banks:
>Rene Pijlman:
>> Ah yes, clever trick. But you'd have to worry about thread-safety of your
>> subclass though.
>
>Queue worries about this for you. The Queue class only calls _get when
>it has the queue's mutex, so you can assume thread safety when
>subclassing it.
Ah yes, I overlooked the underscore. But you'd have to worry about
everything get() is doing before it calls _get() though :-)
>Say you were writing a FiniteQueue class that implemented the permament
>sentinel trick to indicate to all consumer threads that the queue is
>done. For your own code, you may know that you'll never need to pass
>None through the queue, but you can't assume that for all code.
Ah, this is where assert proves its value.
class FiniteQueue(object):
def putTask(self,task):
assert task is not None
self.workQueue.put(task)
self.numberOfTasks += 1
# ...
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René Pijlman
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