> Maybe.  At least we need to add a "timeout" argument to asyncio.run() to let it wait for executor jobs.

The shutdown() method of concurrent.futures.Executor API doesn't accept a timeout. It waits for multiple things.

I added "block_on_close = True" class attribute to socketserver.ForkingMixIn and socketserver.ThreadingMixIn. By default, server_close() waits until all children complete, but the wait is non-blocking if block_on_close is false.