Classical

Operating System - Process Concurrency & Synchronization

1:  

In a time-sharing operating system, when the time slot given to a process is completed, the process goes from the RUNNING state to the

A.

BLOCKED state

B.

READY state

C.

SUSPENDED state

D.

TERMINATED state

 
 

Option: B

Explanation :


2:  

Mutual exclusion problem occurs between

A.

two disjoint processes that do not interact

B.

processes that share resources

C.

processes that do not use the same resource

D.

none of these

 
 

Option: B

Explanation :


3:  

A file server uses a form of locking as a concurrency control technique. When a file is locked by a client, all attempts to use or lock the file by other clients are prevented by the server. A potential problem exists if a client requests a lock on a file and then crashes. This situation could result in the file being locked indefinitely. To prevent this from occurring, the file server starts a time whenever it sets a lock. If the timer runs out before the file is unlocked the server assumes that the client has crashed and releases the lock. Which of the following is (are) true of this strategy?

A.

It provides a solution to the problem of preventing indefinite lockout.

B.

It may result in interleaved access to a file by two or more clients.

C.

It will guarantee mutual exclusion.

D.

It will fail to guarantee the prevention of indefinite lockout

 
 

Option: A

Explanation :


4:  

At a particular time, the value of a counting semaphore is 10. It will become 7 after

A.

3 V operations

B.

3 P operations

C.

5 V operations and 2 P operations

D.

None of these

 
 

Option: B

Explanation :

P means wait ie S:= S-1;

V means signal i.e S= S+1;


5:  

At a particular time of computation, the value of a counting semaphore is 7. Then 20 P operations and 'x' V operations were completed on this semaphore. If the final value of the semaphore is 5, x will be

A.

22

B.

18

C.

15

D.

13

 
 

Option: B

Explanation :

Each P operation will decrease the semaphore value by 1 and V operation increases by 1.
If x is 18, i.e 18 V operations  on counting semaphore with value 7 will make it 25 .
and 20 P operations will make it 5.
Hence the answer.




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Syllabus covered in this section is-

  • Main functions of operating systems
  • Multiprogramming, multiprocessing and multitasking
  • Memory Management- Virtual memory, paging, fragmentation
  • Concurrent Processing: Mutual exclusion, Critical regions, locks and unlock.
  • Scheduling: CPU scheduling. I/O scheduling, Resource scheduling
  • Deadlock and scheduling algorithms.
  • Banker's algorithm for deadlock handling.

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