一个从非空运行队列的前端分派的线程具有最高的优先级。
A thread is dispatched from the front of the nonempty run-queue with the highest priority.
释放锁以后，系统从争用者的最高优先级队列的前端选择线程，以便试图锁定对象。
When a lock is released, the system chooses the thread from the front of the highest-priority queue of contenders to try to lock the object.
通过从队列的前端分派线程和在队列的后端放置过期的线程，程序在一个优先级中轮替执行。
By dispatching from a queue's head and placing expired threads at a queue's tail, execution happens in a round-robin fashion within a priority.
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