I am not sending locks explicetly (i.e. I am not using locks), but I do
pass a Queue object from PC instance to _Consumer and _Producer instances
that get/put values from/to the queue -- this is done deliberately.

2011/12/9 Antoine Pitrou <report@bugs.python.org>

>
> Antoine Pitrou <pitrou@free.fr> added the comment:
>
> Yes, Windows needs to pickle objects which are sent to (or returned from)
> a child process. Now you should wonder why you are sending a threading lock
> to the child. Are you sure this is deliberate?
>
> ----------
> nosy: +pitrou
> versions: +Python 2.7, Python 3.2, Python 3.3 -Python 2.6
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