GATE - 1992 | OS | At a particular time of computation the value of a counting semaphore
Posted on 03-03-2022
GATE - 1992 [Operating System]
Question:
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:
|
A |
42 |
|
B |
2 |
|
C |
7 |
|
D |
12 |
Solution:
Option (B) is Correct.
Let the semaphore be S.
Initial value of S is 7.
So after 20P operations and 15V operations the value of semaphore S will be,
S = 7-20+15 = 2