Low Thread Priority 低线程优先 ; 低线程优先权
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.
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。
An application that must respond to events in a well-defined time has no way to ensure that another low-priority thread won't get scheduled in front of a high-priority thread.
一个必须在精确时间内响应事件的应用程序无法确保不会在一个高优先级线程之前调度另一个低优先级线程。
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.
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。
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