Issue with threads and ZeroMQsockets: May a secondary thread use the socket created by the main thread?

I'm getting the error:

terminating with uncaught exception of type zmq::error_t: Socket operation on non-socket

with this code:

auto p = theSocket;

theThread = new std::thread ( [p] () { 
    zmq::message_t request;
    p->recv (&request);
  } );

while having no issue with this one:

auto p = theSocket;

zmq::message_t request;
p->recv (&request);

Is it because only the thread that created the socket can use it in 0mq?

Thanks.