a)Given the following solution for the critical section problem for two processes (the code shown is for processes Pi), show why it does not satisfy the mutual exclusion requirement. Here, lock is flag[i] and flag[j] a shared variable initialized to FALSE. (Hint: Indicate one scenario where the progress requirement is violated.)

(b) What happens if lock is initialized to TRUE in the above code?

Four processes P1 P4 are sharing a resource R1 in a mutually exclusive manner. Using test_and_set instruction, show code for P1-P4 that shows the entry section and exit section (similar to the code shown in Question 4). Using this code, show a scenario if all four processes want to enter their critical sections

Im not sure to explain these 2 questions

Question 4. [Points 6] (a) Given the following solution for the critical section problem for two processes (the code shown is for processes Pi), show why it does not satisfy the mutual exclusion requirement. Here, lock is flagli] and flagljl a shared variable initialized to FALSE. Hint: Indicate one scenario where the progress requirement is violated.) do while (lock); lock TRUE; Critical section lock- FALSE; Remainder section (b) What happens if lock is initialized to TRUE in the above code? Question 5. Points 4] Four processes P1 - P4 are sharing a resource R1 in a mutually exclusive manner. Using test_and set instruction, show code for P1-P4 that shows the entry section and exit section (similar to the code shown in Question 4). Using this code, show a scenario if all four processes want to enter their critical sections