Multicast streams are created orderly according to service queuepriority value and fewer multicast streams are needed for the large scalable video-on-demand service.
根据服务队列的优先级，顺序地建立主流，并且在大规模视频服务中只需少量的主流。
3
A thread with an RT priority that voluntarily yields is placed at the back of the queue for its priority.