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Ch6 行程同步（Process Synchronization）
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24. Priority Inversion、Priority Inheritance、Priority Ceiling
#OS-06-024
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Priority Inversion
Priority Inheritance
Priority Ceiling
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(2%) Which statement about priority inversion and its mitigation is correct?
A
Priority inheritance ensures that a high-priority task can never be blocked by a lower-priority task, since the lower-priority task is immediately boosted above all others and runs to completion.
B
Priority inversion occurs only with non-preemptive kernels; in a fully preemptive RTOS it cannot happen because the scheduler always runs the highest-priority task.
C
Replacing mutexes with spinlocks eliminates priority inversion because spinlocks never block; they only busy-wait.
D
Priority ceiling protocols can prevent deadlock and bound blocking time by restricting which tasks may lock a resource based on a preassigned ceiling, but they may reduce parallelism by being conservative.
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