Consider the following scenario where two processes are sharing a common variable. Global setup int turn = 1; Process 1 while(1) { while(turn == 2); // lock // critical section turn = 2; // unlock // remainder section } Process 2 while(1) { while(turn == 1); // lock // critical section turn = 1; // unlock // remainder section } Which of the following statements about the given processes is correct?

(B) Process 1 will always enter its critical section before Process 2.

(A) Process 1 and Process 2 will enter their critical sections simultaneously, leading to race conditions.

(C) Process 2 will always enter its critical section before Process 1.

(D) Deadlock can occur if both processes try to enter their critical sections simultaneously.

Operating Systems · Quiz 2 · 4 Aug 2024 · May 2024 term

Question 15: Consider the following scenario where two processes are …

Question 15

+4 marksOne correct option

Consider the following scenario where two processes are sharing a common variable.

Global setup

1int turn = 1;

Process 1

1while(1) {
2    while(turn == 2); // lock
3    // critical section
4    turn = 2; // unlock
5    // remainder section
6}

Process 2

1while(1) {
2    while(turn == 1); // lock
3    // critical section
4    turn = 1; // unlock
5    // remainder section
6}

Which of the following statements about the given processes is correct?

A
Process 1 and Process 2 will enter their critical sections simultaneously, leading to race conditions.
B
Process 1 will always enter its critical section before Process 2.
C
Process 2 will always enter its critical section before Process 1.
D
Deadlock can occur if both processes try to enter their critical sections simultaneously.

Show answer

Correct answer

B
Process 1 will always enter its critical section before Process 2.

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Question 15 of 18 in the IIT Madras BS Operating Systems (Operating Systems) Quiz 2 paper sat on 4 Aug 2024, in the May 2024 term (IIT M IMPROVEMENT AN EXAM QIM4 4 Aug 2024). It carries 4 marks.

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