Standard way to send code to main (kernel/ui) thread from worker thread

lib.backgroundjobs provdes an interface to run code in the background, but I see no simple way of sending code back to the main thread to execute in the main thread, i e to update a matplotlib plot during a long simulation. I guess I can hack it and directly use the thread-safe interface of whatever ui eventloop that happens to be used (Qt5 currently), but is there a standard recommended interface to do this?