Mutual-Exclusion and Bounded-Waiting Requirement in Operating Systems
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Questions and Answers

Which requirement is not satisfied by the algorithm using the Swap() instruction?

  • Bounded-waiting (correct)
  • Lock handling
  • Data structure initialization
  • Mutual-exclusion
  • What is the purpose of the TestAndSet() instruction in the algorithm that satisfies all critical-section requirements?

  • Guarantee bounded-waiting
  • Ensure mutual exclusion (correct)
  • Handle lock conditions
  • Initialize the data structures
  • In the given algorithms, what triggers a process to enter its critical section?

  • waiting[i] == false
  • Data structure initialization
  • key == false (correct)
  • TestAndSet() execution
  • What happens when the first process executes TestAndSet() in the algorithm?

    <p>Sets key to false</p> Signup and view all the answers

    Which data structure is crucial for implementing bounded-waiting mutual exclusion?

    <p>Boolean waiting[n];</p> Signup and view all the answers

    What does the condition j == i signify in the algorithm for bounded-waiting mutual exclusion?

    <p>Lock release</p> Signup and view all the answers

    What does the value of 'turn' represent in the given context?

    <p>An indicator determining which process can access the critical section</p> Signup and view all the answers

    How does the condition 'flag[j] == true and turn == j' impact mutual exclusion?

    <p>It enforces that only one process can access the critical section at a time</p> Signup and view all the answers

    Why must Pi execute at least one additional statement ('turn==j') before accessing the critical section?

    <p>To ensure mutual exclusion is preserved</p> Signup and view all the answers

    How does Pj reset the flag [j] to allow Pi to enter its critical section?

    <p>By setting 'flag[j]' to false after exiting its critical section</p> Signup and view all the answers

    What action must Pj take if it resets flag [j] to true in the given scenario?

    <p>Set turn to i</p> Signup and view all the answers

    How many times can Pi enter the critical section before Pj has a chance to do so?

    <p>Once</p> Signup and view all the answers

    In Peterson's solution, what does it mean when flag[i] is set to true?

    <p>Process Pi is ready to enter its critical section</p> Signup and view all the answers

    What does the eventual value of the 'turn' variable determine in Peterson's solution?

    <p>Which process is allowed to enter its critical section first</p> Signup and view all the answers

    Why is it necessary for a process to set flag[j] == false or turn == i before entering its critical section in Peterson's solution?

    <p>To ensure mutual exclusion</p> Signup and view all the answers

    What happens if both processes try to enter the critical section at the same time in Peterson's solution?

    <p>One process is allowed to enter based on 'turn'</p> Signup and view all the answers

    Which condition must be satisfied for a process to enter its critical section in Peterson's solution?

    <p>'flag[j] == false' or 'turn == i'</p> Signup and view all the answers

    Why does Peterson's solution focus on preserving mutual exclusion?

    <p>To ensure only one process accesses a shared resource at a time</p> Signup and view all the answers

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