GATE | GATE CS 2010 | Question 45

The following program consists of 3 concurrent processes and 3 binary semaphores.The semaphores are initialized as S0 = 1, S1 = 0, S2 = 0.


How many times will process P0 print ‘0’?
(A) At least twice
(B) Exactly twice
(C) Exactly thrice
(D) Exactly once

Answer: (A)

Explanation: Initially only P0 can go inside the while loop as S0 = 1, S1 = 0, S2 = 0.

P0 first prints ‘0’ then, after releasing S1 and S2, either P1 or P2 will execute and release S0. So 0 is printed again.

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