请记住，线程获取的cpu量不仅依赖于优先级，还依赖于需要调度的线程总数。
Keep in mind that the amount of CPU a thread gets becomes dependent not only on the priority but also on the total number of threads that need to be scheduled.
就像规范要求的那样，一个低优先级线程(优先级p3)获取了一个对象的锁，会被一个高优先级(优先级p1)的线程夺取执行权。
A low priority thread (at priority P3) acquires the lock on an object and is pre-empted by a higher priority thread (at priority P1), as the specification mandates.
优先级继承背后的思想是锁争用，锁持有者的优先级被提高到希望获取锁的线程的优先级。
The idea behind priority inheritance is that at the point of lock contention, the lock holder's priority is boosted to that of the thread wishing to acquire the lock.
可能存在下面一种情况：高优先级线程试图获取低优先级线程持有的锁，而低优先级线程自身又被另一个线程持有的另一个锁阻塞。
It's possible that, at the point the high-priority thread tries to acquire the low-priority thread's lock, the low-priority thread itself is blocked on a different lock held by a another thread.
获取线程的基本优先级。
获取线程的基本优先级。
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