Q4. (Inter Processing Communications)

With regard to proposal 4 (Petersons Solution), if there are two processes Process 0 and Process 1 and Context Switching happens like the following sequence, please complete the execution flow and answer the question whether both these processes can enter the critical section.

1 #define FALSE 0

2 #define TRUE 1

3

4 int turn;

5 int interested[2] = {0,0};

6

7 void enter_region(int process)

8 {

9 int other;

10

11 other = 1-process;

12 interested[process] = TRUE;

13 turn = process;

14 while (turn == process && interested[other] == TRUE)

15 ; /* busy waiting */

16 }

17

18 void leave_region(int process)

19 {

20 interested[process] = FALSE;

21 }

Given sequence:

Process 0 Process 1 Process 1 enter region: 7-12 Context Switching enter region: 7-12 Context Switching enter region: 13-14 Context Switching