handshake_t
send_handshake_message(thread_id target, const handshake_t& handshake)
return send_data(target, 0, &handshake, sizeof(handshake_t));
receive_handshake_message(handshake_t& handshake)
receive_data(&sender, &handshake, sizeof(handshake_t));
handshake_t handshake;