pthread_mutex_lock(&ust_reg->lock);
ret_push = ust_app_push_metadata(ust_reg, socket, 1);
pthread_mutex_unlock(&ust_reg->lock);
pthread_mutex_lock(&ust_reg->lock);
ret_push = ust_app_push_metadata(ust_reg, socket, 1);
pthread_mutex_unlock(&ust_reg->lock);