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A critical section in application code protects shared data by

  • A.preventing preemption for its duration
  • B.copying the data into the task's own stack while it is used
  • C.raising the task's priority above every interrupt source
  • D.delaying every other task until the next kernel tick arrives

Answer: A

Correct answer: preventing preemption for its duration

A critical section disables interrupts or the scheduler so that no other task or handler can touch the data while it is being changed. That is why it must be short: nothing else can run, so its length adds directly to the latency of everything in the system.

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