ISRO | ISRO CS 2016 | Question 43

A system has 3 processes sharing 4 resources. If each process needs a maximum of 2 units, then
(A) Deadlock can never occur
(B) Deadlock may occur
(C) Deadlock has to occur
(D) None of these


Answer: (A)

Explanation: A condition for deadlock can not occur: P(n-1) + 1 <= R where, P = number of processes ; n = max requirement of each process ; R = Total number of available resources So, if a system has 3 processes sharing 4 resources and each process needs a maximum of 2 units then: P = 3, n = 2 and R = 4 =3(2-1) + 1 <= 4, deadlock can never occur.

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