How to use the flower.core.sched.tasklet function in flower

def add(self, t):
        with self._lock:
            self._add_timer(t)

            if self.sleeping:
                self.sleeping = False
                taskwakeup(self._timerproc)

            if self._timerproc is None or not self._timerproc.alive:
                self._timerproc = tasklet(self.timerproc)()

def switch(self):
        if not self.running:
            self._runtask = tasklet(self.run)()

        getcurrent().remove()
        self._runtask.switch()

def __init__(self):
        # define the main tasklet
        self._main_coroutine = _coroutine_getmain()
        self._main_tasklet = _coroutine_getcurrent()
        self._main_tasklet.__class__ = tasklet
        six.get_method_function(self._main_tasklet._init)(self._main_tasklet,
                label='main')
        self._last_task = self._main_tasklet

        self.thread_id = thread_ident() # the scheduler thread id
        self._lock = threading.Lock() # global scheduler lock

        self._callback = None # scheduler callback
        self._run_calls = [] # runcalls. (tasks where run apply
        self.runnable = deque() # runnable tasks
        self.blocked = 0 # number of blocked/sleeping tasks
        self.append(self._main_tasklet)

def __init__(self):
        self.loop = pyuv.Loop()
        self._async = pyuv.Async(self.loop, self._wakeloop)
        self._async.unref()
        self.fds = {}
        self._lock = threading.RLock()
        self.running = False

        # start the server task
        self._runtask = tasklet(self.run, "uv_server")()