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Priority inversion occurs when a high priority task is delayed by

  • A.the scheduler recomputing the priority order
  • B.an interrupt handler of higher priority than itself
  • C.a low priority task holding a resource it needs
  • D.another task of exactly equal priority

Answer: C

The high priority task must wait for the lock, and while it waits a medium priority task can preempt the lock holder and extend the wait indefinitely. That unbounded form is what wrecked the Mars Pathfinder mission and made the term famous.

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