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A1.3 Operating systems and control systemsA1.3.4

Polling and interrupt handling

Evaluate the use of polling and interrupt handling

SL + HL≈ 45 minCommand term: EvaluatePremium

In this lesson

  • How polling and interrupt handling work
  • Weighing them by event frequency, CPU overhead, power source, event predictability, controlled latency and security
  • Choosing between them for keyboards, mice, networks, disks, embedded and real-time systems

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What's inside

  1. LearnTwo ways to notice an event
  2. CheckOrder the steps
  3. LabPolling versus interrupts
  4. LearnEvaluating the two approaches
  5. CheckPolling or interrupts?
  6. LearnReal-world scenarios
  7. ExamWorked exam answer
  8. ReviewMistakes examiners see
  9. Exam practiceExam-style questions

Ends with 5 exam-style questions worth 12 marks, with a self-marking markscheme.