问通过add_done_callback添加回调是在何时何地触发的？

EN

import asyncio


async def main():
    print("OK Google. Wake me up in 1 seconds.")
    await asyncio.sleep(1)
    print("Wake up!")


if __name__ == "__main__":
    asyncio.run(main(), debug=False)

def add_done_callback(self, fn, *, context=None):
    """Add a callback to be run when the future becomes done.
    The callback is called with a single argument - the future object. If
    the future is already done when this is called, the callback is
    scheduled with call_soon.
    """
    if self._state != _PENDING:
        self._loop.call_soon(fn, self, context=context)
    else:
        if context is None:
            context = contextvars.copy_context()
        self._callbacks.append((fn, context))