Semaphores MCQ

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• Spinlocks are intended to provide __________ only.
  ক

  Mutual Exclusion

  খ

  Bounded Waiting

  গ

  Aging

  ঘ

  Progress
• Semaphores are mostly used to implement ____________
  ক

  System calls

  খ

  IPC mechanisms

  গ

  System protection

  ঘ

  None of the mentioned
• A binary semaphore is a semaphore with integer values ____________
  ক

  1

  খ

  -1

  গ

  0.8

  ঘ

  0.5
• 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)
  ক

  42

  খ

  2

  গ

  7

  ঘ

  12
• What is a mutex?
  ক

  is a binary mutex

  খ

  must be accessed from only one process

  গ

  can be accessed from multiple processes

  ঘ

  none of the mentioned
• What are the two kinds of semaphores?
  ক

  mutex & counting

  খ

  binary & counting

  গ

  counting & decimal

  ঘ

  decimal & binary
• What is a semaphore?
  ক

  is a binary mutex

  খ

  must be accessed from only one process

  গ

  can be accessed from multiple processes

  ঘ

  none of the mentioned
• What will happen if a non-recursive mutex is locked more than once?
  ক

  Starvation

  খ

  Deadlock

  গ

  Aging

  ঘ

  Signaling
• The code that changes the value of the semaphore is ____________
  ক

  remainder section code

  খ

  non – critical section code

  গ

  critical section code

  ঘ

  none of the mentioned
• If the semaphore value is negative ____________
  ক

  its magnitude is the number of processes waiting on that semaphore

  খ

  it is invalid

  গ

  no operation can be further performed on it until the signal operation is performed on it

  ঘ

  none of the mentioned
• The signal operation of the semaphore basically works on the basic _______ system call.
  ক

  continue()

  খ

  wakeup()

  গ

  getup()

  ঘ

  start()
• The wait operation of the semaphore basically works on the basic _______ system call.
  ক

  stop()

  খ

  block()

  গ

  hold()

  ঘ

  wait()
• What is the main disadvantage of spinlocks?
  ক

  they are not sufficient for many process

  খ

  they require busy waiting

  গ

  they are unreliable sometimes

  ঘ

  they are too complex for programmers
• What are Spinlocks?
  ক

  CPU cycles wasting locks over critical sections of programs

  খ

  Locks that avoid time wastage in context switches

  গ

  Locks that work better on multiprocessor systems

  ঘ

  All of the mentioned
• What are the two atomic operations permissible on semaphores?
  ক

  wait

  খ

  stop

  গ

  hold

  ঘ

  none of the mentioned
• Semaphore is a/an _______ to solve the critical section problem.
  ক

  hardware for a system

  খ

  special program for a system

  গ

  integer variable

  ঘ

  none of the mentioned
• TestAndSet instruction is executed ____________
  ক

  after a particular process

  খ

  periodically

  গ

  atomically

  ঘ

  none of the mentioned
• An un-interruptible unit is known as ____________
  ক

  single

  খ

  atomic

  গ

  static

  ঘ

  none of the mentioned