ioloop.py 文件源码

def __init__(self, deadline, callback, io_loop):
        if not isinstance(deadline, numbers.Real):
            raise TypeError("Unsupported deadline %r" % deadline)
        self.deadline = deadline
        self.callback = callback
        self.tiebreaker = next(io_loop._timeout_counter)

    # Comparison methods to sort by deadline, with object id as a tiebreaker
    # to guarantee a consistent ordering.  The heapq module uses __le__
    # in python2.5, and __lt__ in 2.6+ (sort() and most other comparisons
    # use __lt__).