于是低优先级任务就会被调度运行，然后释放锁，这时其优先级就恢复到原来的优先级了。
The low priority task can now run and unlock the mutex - at this point it is returned back to its original priority.
于是低优先级任务就会被调度运行，然后释放锁，这时其优先级就恢复到原来的优先级了。
The low priority task can now run and unlock the mutex - at this point it is returned back to its original priority.
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