Queue.Queue-like class without the busy-wait

[Paul L. Du Bois]

Has anyone written a Queue.Queue replacement that avoids busy-waiting?
It doesn't matter if it uses os-specific APIs (eg
WaitForMultipleObjects).  I did some googling around and haven't found
anything so far.

Because I know someone will ask: no, the busy-waiting hasn't been a
problem in my app.  I'm just interested in reading the code.

p