Question 19: Consider the following scenario where two processes are …

1int lock[2]= {0,0};

1while(1){
2    lock[0] = 1;
3    while(lock[1]);
4    // critical section
5    lock[0] = 0;
6    // remainder section
7}

1while(1){
2    lock[1] = 1;
3    while(lock[0]);
4    // critical section
5    lock[1] = 0;
6    // remainder section
7}

Select all that apply.

1. A

   It achieves mutual exclusion.

2. B

   It could cause deadlock.

3. C

   Process 2 can enter the critical section multiple times before a context switch if Process 1 is in remainder section.

4. D

   Process 2 can enter the critical section multiple times before a context switch if Process 1 is waiting to enter the critical section.