c++ - zeromq中的router/dealer模式在多线程下的无法收到消息?

Question

期待熟悉zeromq的前辈。

在zeromq的guide里，它用router/dealer模式做了一个broker

client对应ZMQ_REQ类型的zmq_socket
worker对应ZMQ_REP类型的zmq_socket
broker创建一个router和一个dealer，router接受client的消息并转发给worker，worker再把处理结果发送给dealer，dealer再转发给client.

然后我尝试把这个代码做一个变换，由多进程改为多线程，代码如下：
https://gist.github.com/ichenq/61fc280e153313e2d828

可是broker收到client的消息后，却无法发送给worker，不知道是什么原因？
或者不知道我的代码里哪个API没有用对？

Answer 1

Question and answer after 2 hours.

It is indeed a problem with my own code. The parameter ZMQ_SNDMORE passed to zmq_msg_send in the create_broker function is written as ZMQ_MORE.
Now the gist has been updated.

You can use tcp to do multi-threading. The same code can be changed to inproc to do multi-threading.

Another thing to note is that zmq socket does not have domain name resolution when binding. You can only select the IP address or * number (localhost cannot be used), but when connecting to connet, domain name resolution is required. You can No need to specify IP