SMP, GIL and Threads

[catsup]

It was actually quite a minor adjustment in the application to follow
the oft repeated advice here on this subject to share only the Queue
object between threads.  Making the update of the dictionary just
another queued command request caused both the dictionary read and
write to be performed by the same thread.  This seems to have
eliminated the problem.

Thank you all for your thoughtful comments.

Randy