Question 1

In the following program, the number of messages with "BBB" is _______.

int main() { pid_t pid = fork(); /* 1. fork a child process */ printf ("AAA, pid=%d. ", pid); // print out AAA pid = fork(); /* 2. fork another child process */ printf ("BBB, pid=%d. ", pid); // print out BBB pid = fork(); /* 3. and fork another */ printf ("CCC, pid=%d. ", pid); // print out CCC return 0; }

Question 2

In the round robin scheduling, the average turnaround time can be improved, in general, if time quantum is larger. For example, we are given three processes of 5 time units each.

With a quantum of 1 time unit, the average turnaround time is x.

x = ?

With a quantum of 2 time units, the average turnaround time is y.

y= ?

If the time quantum is 13 the average turnaround time drops to z.

z = ?

Question 3

When memory is not enough, processes in ______ states are preferred to be swapped out first.

When memory is sufficient, processes in _______ states are preferred to be swapped in first.