When it is used, a job that never self-suspend is blocked at most once, and the duration of blocking is bounded from above by the maximum execution time of critical sections of lower-priority jobs. 使用该协议,一个作业不可能挂起自己,其至多被优先级低的作业阻塞一次,且阻塞时间仅为一个临界区的执行时间。