Sharing objects between processes

[ET]

I have been using the 'threading' library and decided to try swapping it
out for 'processing'... while it's awesome that processing so closely
mirrors the threading interface, I've been having trouble getting my
processes to share an object in a similar way.

Using the 'with' keyword didn't work, and using normal locks doesn't
result in the expected behavior (I can get an object to be accessible in
more than one process, and Python indicates that the instances are
living at the same address in memory, but changes in one process are not
reflected in the other[s]).  I'm sure this is because my expectations
are incorrect. :)

The problem, as briefly as possible:
I have three processes which need to safely read and update two objects.

I've been working with processing, multiprocessing, and parallel python,
trying to get this working... I suspect it can be accomplished with
managers and/or queues, but if there's an elegant way to handle it, I
have thus far failed to understand it.

I don't particularly care which library I use; if someone has done this
or can recommend a good method they're aware of, it'd be incredibly
helpful.

Thank you!