However, tye's suggestion that I run one widget in its own thread the rest of the application in a different thread will not work with Prima, as the documentation that you link suggests.

tye suggested you do what works, which is only run prima in a child thread, and communicate through pipe/sockets, the same thing prima faq suggests

In reply to Re^5: Capturing XS printf output with a tied filehandle (lots) by Anonymous Monk
in thread Capturing XS printf output with a tied filehandle by run4flat

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