为什么我的队列挂着异步事件循环

Question

I'm launching a new process ( edit the same thing applies to a new thread ) for computations from an async event loop. The new process has it's own asyncio event loop running and runs fine without any kind of blocking behavior.

I created two queues ( multiprocessing.Queue or multiprocessing.Manager.Queue ), one for outgoing messages, and another for incoming messages. I get the same behavior with both queues. The queue for outgoing messages is working fine, as I put/get a message on the queue with:

await asyncio.get_running_loop().run_in_executor(None, self.incoming_queue.put, msg)
msg = await asyncio.get_running_loop().run_in_executor(None, self.incoming_queue.get, True, 1)

However, when I attempt to run the same get() command in my original asyncio application using the asyncio run_in_executor command, it just hangs. The event loop itself seems fine and responsive.

Disabling the working queue doesn't change things, and neither does the executor (default, thread, or process).

Ideas?

Answer 1

I've decided to make an answer here based on my investigation. In short: what works in a new event loop in a new process does NOT work in the Django Channels event loop for one reason or another.

My current solution is to manually create a new thread to run my synchronous listener in. I'm looking into options for why the Channels event loop wouldn't work in my use case.