What is a semaphore?

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Question:
What is a semaphore?

1.is a binary mutex

2.must be accessed from only one process

3.can be accessed from multiple processes

4. none of the mentioned

Posted Date:-2022-03-22 09:23:24

More MCQS Questions and answers

  1. A process is selected from the ______ queue by the ________ scheduler, to be executed.
  2. Bounded waiting implies that there exists a bound on the number of times a process is allowed to enter its critical section ____
  3. Semaphore is a/an _______ to solve the critical section problem.
  4. What are the two atomic operations permissible on semaphores?
  5. Which is the most optimal scheduling algorithm?
  6. Which of the following conditions must be satisfied to solve the critical section problem?
  7. A binary semaphore is a semaphore with integer values _____
  8. A minimum of _____ variable(s) is/are required to be shared between processes to solve the critical section problem.
  9. A situation where several processes access and manipulate the same data concurrently and the outcome of the execution depends on the particular order in which access takes place is called ________
  10. A solution to the problem of indefinite blockage of low – priority processes is _____
  11. An I/O bound program will typically have _____
  12. An SJF algorithm is simply a priority algorithm where the priority is ______
  13. An un-interruptible unit is known as ______
  14. At a particular time of computation the value of a counting semaphore is 7.Then 20 P operations and 15 V operations were completed on this semaphore. The resulting value of the semaphore is? (GATE 1987)
  15. Choose one of the disadvantages of the priority scheduling algorithm?
  16. Concurrent access to shared data may result in ________
  17. CPU scheduling is the basis of ______
  18. If the semaphore value is negative ____
  19. In the bakery algorithm to solve the critical section problem ______
  20. In the following cases non – preemptive scheduling occurs?
  21. Mutual exclusion implies that _______
  22. Orders are processed in the sequence they arrive if _______ rule sequences the jobs.
  23. Preemptive Shortest Job First scheduling is sometimes called ______
  24. Scheduling is done so as to _______
  25. Semaphores are mostly used to implement _______
  26. TestAndSet instruction is executed ______
  27. The code that changes the value of the semaphore is ________
  28. The real difficulty with SJF in short term scheduling is _____
  29. The segment of code in which the process may change common variables, update tables, write into files is known as _____
  30. The signal operation of the semaphore basically works on the basic _______ system call.
  31. The strategy of making processes that are logically runnable to be temporarily suspended is called _____
  32. The switching of the CPU from one process or thread to another is called _____
  33. The wait operation of the semaphore basically works on the basic _______ system call.
  34. There are 10 different processes running on a workstation. Idle processes are waiting for an input event in the input queue. Busy processes are scheduled with the Round-Robin time sharing method. Which out of the following quantum times is the best value for small response times, if the processes have a short runtime, e.g. less than 10ms?
  35. Under multiprogramming, turnaround time for short jobs is usually ________ and that for long jobs is slightly _____
  36. What are Spinlocks?
  37. What are the two kinds of semaphores?
  38. What are the two steps of a process execution?
  39. What is a mutex?
  40. What is a semaphore?
  41. What is ‘Aging’?
  42. What is Response time?
  43. What is Scheduling?
  44. What is the main disadvantage of spinlocks?
  45. What is Turnaround time?
  46. What is Waiting time?
  47. What will happen if a non-recursive mutex is locked more than once?
  48. Which of the following algorithms tends to minimize the process flow time?
  49. Which of the following scheduling algorithms gives minimum average waiting time?
  50. With multiprogramming ______ is used productively.
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