C replacement for Queue module

[Jason Lai]

As far as Queues go, the adding/popping is apparently done with deque
which are implemented in C. The Queue class pretty much just provides
blocking operations and is otherwise a very thin layer around deque. As
far as primitives go, only threading.Lock is written in C and the
others are pure Python, so they're not that fast, which might be a
reason for Queue's slowness.

As far as writing a custom C module, you could probably leave most of
the work to deque and just implement blocking. If you stick to a simple
lock primative, you can keep it portable and use Python's abstracted
thread interface with an amazing choice of two whole functions: acquire
and release.