NIELIT 2018-57

Question

In a system, counting semaphore was initialized to $10$, then $6P$(wait) operations and $4V$ (signal) operations were completed on this semaphore. So _____ is the final value of the semaphore.

• A. $7$
• B. $8$
• C. $13$
• D. $12$

Answer 1

Wait operation decreases the value of counting semaphore and signal operation increases the value so

final value of counting semaphore =10-6+4=8

Correct answer is B