Bug report

Bug description:

This is a toy program that sets an asyncio.Event when a signal is received, and runs an asynchronous function (passive_wait) that waits for that signal to be set.

When the following code is executed and a signal is sent externally, it is detected by the program, but the function waiting function does not resume execution.

It does finish correctly if another async function is executed alongside, like when uncommenting the lineactive_wait(),.

importasyncioimportsignalevent=asyncio.Event()def_signal_handler(*_)->None:event.set()print("Event triggered")signal.signal(signal.SIGINT,_signal_handler)signal.signal(signal.SIGTERM,_signal_handler)asyncdefpassive_wait():print("Pre event")awaitevent.wait()print("Post event")asyncdefactive_wait():whilenotevent.is_set():awaitasyncio.sleep(1)asyncdefmain():awaitasyncio.gather(passive_wait(),# Uncommenting the following line makes it stop correctly#active_wait(),    )asyncio.run(main())# Send the signal externally

If that's the intended behavior I would love some pointers.

CPython versions tested on:

3.12

Operating systems tested on:

Linux