[zeromq-dev] Query

[Quinlan Morake]

Good day everyone, 

I figure that perhaps in a later chapter of one of the books, or perhaps by browsing through the source (not at that level yet), I could figure this out; but what is the difference between the following sections of code (if any), and which is preferable / right (if applicable - perhaps under the hood they are the same)


 void* sClientInitListener = zmq_socket(sData->zmqContext, ZMQ_REP);
 int iPortOp = zmq_bind(sClientInitListener, CLIENT_INITIALIZE_LISTENER);
 assert(iPortOp == 0);
  
 void* sServerInitSender = zmq_socket(sData->zmqContext, ZMQ_REQ);
 iPortOp = zmq_connect(sServerInitSender, CLIENT_INITIALIZE_SENDER);
 assert(iPortOp == 0);
  
 while (*sData->blnRun)
 {
    char* sSendToServer = s_recv(sClientInitListener);
    if (sSendToServer != NULL)
    {
      s_send(sServerInitSender, sSendToServer);
      char* sRepFromServer = s_recv(sServerInitSender);
      s_send(sClientInitListener, sRepFromServer);
    }
 }
 zmq_close(sServerInitSender);
 zmq_close(sClientInitListener);


VS


 void* sClientInitListener = zmq_socket(sData->zmqContext, ZMQ_REP);
 int iPortOp = zmq_bind(sClientInitListener, CLIENT_INITIALIZE_LISTENER);
 assert(iPortOp == 0);
  
 while (*sData->blnRun)
 {
    char* sSendToServer = s_recv(sClientInitListener);
    if (sSendToServer != NULL)
    {
      void* sServerInitSender = zmq_socket(sData->zmqContext, ZMQ_REQ);
      iPortOp = zmq_connect(sServerInitSender, CLIENT_INITIALIZE_SENDER);
      assert(iPortOp == 0);

      s_send(sServerInitSender, sSendToServer);
      char* sRepFromServer = s_recv(sServerInitSender);
      zmq_close(sServerInitSender);

      s_send(sClientInitListener, sRepFromServer);
    }
 }
 zmq_close(sClientInitListener);


My understanding is that in the first instance; after s_recv(sClientInitListener), we’re in a different thread than that which executed “s_recv(sClientInitListener)” so its a different thread that’s executing the “s_send(sServerInitSender..” which would mean I’m sharing sockets over threads, which I shouldn’t be doing. But I’m almost certain that I saw something similar being done in examples and in the books (Pg 18 O’ Reily ZeroMQ for example). So I must be understanding something incorrectly. 

Regards,
Quinlan
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