Question 1

1int turn = 1;

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

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

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? Figure from the original question paper Figure from the original question paper