Method _wake_up_first

Lib/asyncio/locks.py:144–155

Ensure that the first waiter will wake up.

(self)

            raise RuntimeError('Lock is not acquired.')

    def _wake_up_first(self):
        """Ensure that the first waiter will wake up."""
        if not self._waiters:
            return
        try:
            fut = next(iter(self._waiters))
        except StopIteration:
            return

        # .done() means that the waiter is already set to wake up.
        if not fut.done():
            fut.set_result(True)


class Event(mixins._LoopBoundMixin):