Because of multithreading semantics, this is not reliable.

[OlafMeding at gmail.com]

Because of multithreading semantics, this is not reliable.  This
sentence is found in the Python documentation for "7.8.1 Queue
Objects".

This scares me!  Why would Queue.qsize(), Queue.empty( ), and a
Queue.full() not be reliable?

Looking at the source code of Queue.py, all 3 calls use a mutex (based
on thread.allocate_lock()).  Does this mean that the
thread.allocate_lock() mechanism is not reliable (scary indeed) or does
this have to do with other implementation details?

Many thanks for explaining this mystery.

Olaf