How to use the eventlet.event function in eventlet

func(*args, **kwargs) directly, followed by eventlet.sleep() to ensure
        the eventlet hub has a chance to execute. It is more likely the hub
        will be invoked when queuing operations to an external thread.

        :returns: result of calling func
        :raises: whatever func raises
        """
        if not self._alive:
            raise ThreadPoolDead()

        if self.nthreads <= 0:
            result = func(*args, **kwargs)
            sleep()
            return result

        ev = event.Event()
        self._run_queue.put((ev, func, args, kwargs), block=False)

        # blocks this greenlet (and only *this* greenlet) until the real
        # thread calls ev.send().
        result = ev.wait()
        return result

self.topic_proxy[topic] = eventlet.queue.LightQueue(
                    CONF.rpc_zmq_topic_backlog)
                self.sockets.append(out_sock)

                # It takes some time for a pub socket to open,
                # before we can have any faith in doing a send() to it.
                if sock_type == zmq.PUB:
                    eventlet.sleep(.5)

                waiter.send(True)

                while(True):
                    data = self.topic_proxy[topic].get()
                    out_sock.send(data, copy=False)

            wait_sock_creation = eventlet.event.Event()
            eventlet.spawn(publisher, wait_sock_creation)

            try:
                wait_sock_creation.wait()
            except RPCException:
                LOG.error(_("Topic socket file creation failed."))
                return

        try:
            self.topic_proxy[topic].put_nowait(data)
        except eventlet.queue.Full:
            LOG.error(_("Local per-topic backlog buffer full for topic "
                        "%(topic)s. Dropping message.") % {'topic': topic})

def restart(self):
        self.stop()
        self.done = event.Event()
        for restart_service in self.services:
            restart_service.reset()
            self.tg.add_thread(self.run_service, restart_service, self.done)

def start(self, interval, initial_delay=None):
        self._running = True
        done = event.Event()

        def _inner():
            if initial_delay:
                greenthread.sleep(initial_delay)

            try:
                while self._running:
                    start = _ts()
                    self.f(*self.args, **self.kw)
                    end = _ts()
                    if not self._running:
                        break
                    delay = end - start - interval
                    if delay > 0:
                        LOG.warning(_LW('task %(func_name)r run outlasted '
                                        'interval by %(delay).2f sec'),

def reset(self):
        # NOTE(Fengqian): docs for Event.reset() recommend against using it
        self._done = event.Event()

def start(self, initial_delay=None, periodic_interval_max=None):
        self._running = True
        done = event.Event()

        def _inner():
            if initial_delay:
                greenthread.sleep(initial_delay)

            try:
                while self._running:
                    idle = self.f(*self.args, **self.kw)
                    if not self._running:
                        break

                    if periodic_interval_max is not None:
                        idle = min(idle, periodic_interval_max)
                    LOG.debug('Dynamic looping call %(func_name)r sleeping '
                              'for %(idle).02f seconds',
                              {'func_name': self.f, 'idle': idle})

def restart(self):
        self.stop()
        self.done = event.Event()
        for restart_service in self.services:
            restart_service.reset()
            self.tg.add_thread(self.run_service, restart_service, self.done)

def restart(self):
        self.stop()
        self.done = event.Event()
        for restart_service in self.services:
            restart_service.reset()
            self.tg.add_thread(self.run_service, restart_service, self.done)

def start(self, interval, initial_delay=None):
        self._running = True
        done = event.Event()

        def _inner():
            if initial_delay:
                greenthread.sleep(initial_delay)

            try:
                while self._running:
                    start = _ts()
                    self.f(*self.args, **self.kw)
                    end = _ts()
                    if not self._running:
                        break
                    delay = end - start - interval
                    if delay > 0:
                        LOG.warning(_LW('task %(func_name)r run outlasted '
                                        'interval by %(delay).2f sec'),

def reset(self):
        # NOTE(Fengqian): docs for Event.reset() recommend against using it
        self._done = event.Event()