Method __aenter__

Lib/asyncio/locks.py:503–506

(self)

        return f'<{res[1:-1]} [{extra}]>'

    async def __aenter__(self):
        # wait for the barrier reaches the parties number
        # when start draining release and return index of waited task
        return await self.wait()

    async def __aexit__(self, *args):
        pass