int vl_client_connect_to_vlib (const char *svm_name, const char *client_name,
int rx_queue_size);
int vl_client_connect_to_vlib_no_rx_pthread (const char *svm_name,
int vl_client_connect_to_vlib (const char *svm_name, const char *client_name,
int rx_queue_size);
int vl_client_connect_to_vlib_no_rx_pthread (const char *svm_name,