[zeromq-dev] reusing messages

[Martin Sustrik]

Andrew,

> is it okay to reuse messages? such as in

> zmq_send(sock1, &msg);
> zmq_send(sock2, &msg);
> zmq_send(sock3, &msg);
> zmq_msg_close(&msg);

0MQ is doing zero-copy, meaning that msg's buffer is passed down the 
stack to be sent to the network. Thus, after sending the message first 
time msg will be empty and the empty message will be sent to sock2 and 
sock3.

What you need to do is use zmq_msg_copy() function to create 3 messages. 
These, however, will reference a single buffer, so no worry abour 
copying the data.

Martin