操作系统选择题·五

1. Concurrent access to shared data may result in ____________

   A. data consistency

   B.data insecurity

   C.data inconsistency

   D.none of the mentioned

   
   

2. 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 ____________

   A. data consistency

   B.race condition

   C.aging

   D.starvation

   
   

3. Which of the following conditions must be satisfied to solve the critical section problem?

   A. Mutual Exclusion

   B. Progress

   C. Bounded Waiting

   D. All of the mentioned

   
   

4. A minimum of _____ variable(s) is/are required to be shared between processes to solve the critical section problem.

   A. one

   B.two

   C.three

   D.four

   
   

5. An un-interruptible unit is known as ____________

   A. single

   B.atomic

   C.static

   D.none of the mentioned

   
   

6. Semaphore is a/an _______ to solve the critical section problem.

   A. hardware for a system

   B.special program for a system

   C.integer variable

   D.none of the mentioned

   
   

7. What is the main disadvantage of spinlocks?

   A. they are not sufficient for many process

   B. they require busy waiting

   C. they are unreliable sometimes

   D. they are too complex for programmers

   
   

8. If the semaphore value is negative ____________

   A. its magnitude is the number of processes waiting on that semaphore

   B.it is invalid

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

   D.none of the mentioned

   
   

9. What are the two kinds of semaphores?

   A. mutex & counting

   B. binary & counting

   C. counting & decimal

   D. decimal & binary

   
   

10. If no process is suspended, the signal operation ____________

    A. puts the sy