[zeromq-dev] zmq_msg_recv not blocking

[Jeff Shanab]

The Guide has an assert (rc == 0) that of course exited the program.
I replaced that with the if (rc != 0) block  to get the error

On Mon, Nov 23, 2015 at 8:31 AM, KIU Shueng Chuan <nixchuan at gmail.com>
wrote:

> Note that zmq_msg_recv() returns >= 0 on success.
> On 23 Nov 2015 19:54, "Jeff Shanab" <jshanab at jfs-tech.com> wrote:
>
>> I have used a previous version of zmq with google protocol buffers a few
>> years ago but am trying a simpler project with the newest zmq and have run
>> into a problem.
>>
>> Imagine the weather server and client converted to the multipart message
>> code in the guide. But when I call zmq_msg_recv(&part, subscriber,0), it
>> does not block!
>>
>> do {
>>         /* Create an empty ØMQ message to hold the message part */
>>         zmq_msg_t part;
>>         int rc = zmq_msg_init (&part);
>>         assert (rc == 0);
>>         /* Block until a message is available to be received from socket
>> */
>>         rc = zmq_msg_recv (&part, subscriber,0);
>>
>>         if (rc != 0)
>>         {
>>             std::cout << "First msg Recv error :" << zmq_errno() <<
>> zmq_strerror (zmq_errno()) << std::endl;
>>
>> boost::this_thread::sleep(boost::posix_time::milliseconds(250));
>>             continue;
>>         };
>>
>>         rc = zmq_getsockopt (subscriber, ZMQ_RCVMORE, &more, &more_size);
>>         assert (rc == 0);
>>
>>         ....
>>
>> With this code, I get
>>
>> First msg Recv error :35Resource temporarily unavailable
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed out
>> First msg Recv error :60Operation timed o ...
>>
>> This is on OSX. I am going to try windows and linux after work tonight.
>>
>> Are there any known issues with 4.1.3, zmq_msg_recv and OSX ?
>>
>> _______________________________________________
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>> zeromq-dev at lists.zeromq.org
>> http://lists.zeromq.org/mailman/listinfo/zeromq-dev
>>
>>
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