Concurrency Control Principles
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Questions and Answers

What is the key requirement for the critical-section problem that the text mentions?

  • A bound must exist on the number of times that other processes are allowed to enter their critical sections.
  • The selection of the process that will enter the critical section next cannot be postponed indefinitely. (correct)
  • Each process must execute at a nonzero speed.
  • The relative speed of the n processes must be known.

Which of the following is a limitation of the interrupt-based solution described in the text?

  • It does not solve the critical-section problem.
  • It can lead to starvation, where some processes never enter their critical section.
  • It does not work if the critical section runs for an hour.
  • All of the above. (correct)

What is the key requirement mentioned in the text for the critical-section problem regarding the relative speed of the processes?

  • The processes must execute at a constant speed.
  • The processes must execute at the same speed.
  • The relative speed of the n processes must be known.
  • The processes must execute at a nonzero speed. (correct)

How does the text describe the 'Bounded Waiting' requirement for the critical-section problem?

<p>A bound must exist on the number of times that other processes are allowed to enter their critical sections after a process has made a request. (B)</p> Signup and view all the answers

What is the main issue raised in the text about the interrupt-based solution if there are two CPUs?

<p>The text does not mention any issues with the interrupt-based solution and multiple CPUs. (D)</p> Signup and view all the answers

What is the primary issue that can arise when processes execute concurrently and access shared data?

<p>Race conditions (A)</p> Signup and view all the answers

What is the goal of mechanisms used to ensure the orderly execution of cooperating processes that access shared data?

<p>To maintain data consistency (D)</p> Signup and view all the answers

Which of the following is an example of a race condition discussed in the text?

<p>The Bounded Buffer problem with a shared counter (B)</p> Signup and view all the answers

Which of the following is a mechanism discussed in the text that can be used to solve the critical-section problem and maintain data consistency?

<p>Semaphores (A)</p> Signup and view all the answers

What is the purpose of the critical-section problem in the context of concurrent processes?

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

Which of the following is a hardware-based solution to the critical-section problem mentioned in the text?

<p>Memory barriers (D)</p> Signup and view all the answers

What is the main concern addressed by the critical-section problem?

<p>Preventing multiple processes from executing in their critical section simultaneously (B)</p> Signup and view all the answers

Which of the following best describes the mutual exclusion requirement in the critical-section problem?

<p>Ensuring only one process can execute its critical section at a time (B)</p> Signup and view all the answers

Why is it essential for processes to follow an entry section in the critical-section problem?

<p>To inform other processes about its intent to enter the critical section (D)</p> Signup and view all the answers

What issue can arise if two processes access a shared variable concurrently without synchronization?

<p>Race condition leading to incorrect results (B)</p> Signup and view all the answers

In the critical-section problem, what role does the exit section play after the critical section?

<p>Releases the control of shared resources and variables (D)</p> Signup and view all the answers

Which requirement must be satisfied for a solution to the critical-section problem?

<p>Providing mutual exclusion and progress (A)</p> Signup and view all the answers

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