python - ZeroMQ 推送套接字导致客户端在没有进程监听时不终止

Question

我刚开始弄乱 ZeroMQ，我遇到了一个无法正常终止的客户端问题。特别是我有一个客户端，当没有接收器服务器正在监听时，它可能会“推送”数据，这似乎会使进程在 python 代码完成后挂起。我假设有一些后台线程需要清理——请告诉我如何清理或指向文档。

这是相关的一段代码。如果我在没有监听器的情况下运行进程，并且“self.push”行未注释，则进程挂起

def setup(self):
    print self.name, "connect to sockets"
    ctx = self.ctx = zmq.Context()
    self.pull = ctx.socket(zmq.PULL)
    self.pull.connect(self.ventillatorAddress)
    self.push = ctx.socket(zmq.PUSH)
    self.push.connect(self.sinkAddress)
    self.control = ctx.socket(zmq.SUB)
    self.control.connect(self.publisherAddress)
    self.control.setsockopt(zmq.SUBSCRIBE, "") # get every control message
    self.inbox = ctx.socket(zmq.SUB)
    self.inbox.connect(self.distributorAddress)
    self.inbox.setsockopt(zmq.SUBSCRIBE, self.name) # listen only for messages addressed with name
def start(self):
    print self.name,  "push worker is ready signal"
    # listen for "go" signal
    pollcount = 0
    go = False
    while not go:
        #print "send ready for", self.name
        #self.push.send(self.name+" ready")
        print "listen for 'go'"
        msg = self.recvPoll(self.control)
        if msg is None:
            pollcount += 1
            assert pollcount<10
            print "poll timeout", pollcount
            time.sleep(1)
            continue
        pollcount = 0
        print "recv'd", msg
        assert msg=="go!"
        go = True
    print "go signal received"
    pass

注释行(没有监听器)过程正常完成。 我尝试了 context.term() 和 context.destroy()，但它们似乎没有帮助。

如何清理套接字？或者还有什么线索？提前致谢!

Answer 1

这很可能是由于 ZeroMQ 的 linger 功能。引用自 man page :

The ZMQ_LINGER option shall set the linger period for the specified socket. The linger period determines how long pending messages which have yet to be sent to a peer shall linger in memory after a socket is closed with zmq_close(3), and further affects the termination of the socket's context with zmq_term(3).

默认值导致 ZeroMQ 无限期等待，直到它能够传递卡住的消息。

尝试将 ZMQ_LINGER 套接字选项设置为零或较短的时间(以毫秒为单位)。