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UGC-NET | UGC NET CS 2018 Dec – II | Question 13
  • Last Updated : 05 Oct, 2020

Suppose P, Q and R are co-operating processes satisfying Mutual Exclusion condition. Then if the process Q is executing in its critical section then
(A) ‘P’ executes in critical section
(B) ‘R’ executes in critical section
(C) Neither ‘P’ nor ‘Q’ executes in their critical section
(D) Both ‘P’ and ‘R’ executes in critical section


Answer: (C)

Explanation: Mutual exclusion is a property of process synchronization which states that “no two processes can exist in the critical section at any given point of time”. The term was first coined by Djikstra. Any process synchronization technique being used must satisfy the property of mutual exclusion, without which it would not be possible to get rid of a race condition.

So, option (C) is correct.

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