base_events.py 文件源码

def __init__(self):
        self._timer_cancelled_count = 0
        self._closed = False
        self._stopping = False
        self._ready = collections.deque()
        self._scheduled = []
        self._default_executor = None
        self._internal_fds = 0
        # Identifier of the thread running the event loop, or None if the
        # event loop is not running
        self._thread_id = None
        self._clock_resolution = time.get_clock_info('monotonic').resolution
        self._exception_handler = None
        self.set_debug((not sys.flags.ignore_environment
                        and bool(os.environ.get('PYTHONASYNCIODEBUG'))))
        # In debug mode, if the execution of a callback or a step of a task
        # exceed this duration in seconds, the slow callback/task is logged.
        self.slow_callback_duration = 0.1
        self._current_handle = None
        self._task_factory = None
        self._coroutine_wrapper_set = False

        if hasattr(sys, 'get_asyncgen_hooks'):
            # Python >= 3.6
            # A weak set of all asynchronous generators that are
            # being iterated by the loop.
            self._asyncgens = weakref.WeakSet()
        else:
            self._asyncgens = None

        # Set to True when `loop.shutdown_asyncgens` is called.
        self._asyncgens_shutdown_called = False