Question $2(30$ Marks$)$

A$.$ Write a simple C program with the output "Learning How to code is $C$ is good for developing Operating system"

$5$ Marks

B$.$ The concept of context$-$switch enables the operating systems to move from one process to the other and back. Describe four $(4)$ actions that can be taken by the kernel to achieve this concept

$8$ Marks.

C$.$ A process is a program in execution and during these executions, processes can move from between various stages. Assuming there are two processes $($Process A and Process B$),$ and these processes are in the Ready queue. How would you describe the activities that happened whereby, Process A started first, but process B completed first. $15$ Marks

D$.$ List two types of operating systems.

$2$ Marks

Question $3(20$ Marks$)$

A$.$ Using a C program. Create a separate process from a parent process using the UNIX fork $()$ system call $.$ You are required to discuss your program.

$10$ Marks

B$.$ Discuss how you would implement two operating systems running concurrently on the same hardware. Use ubuntu Linux and windows as your base line operating systems

$10$ Marks

Page $2$ of $3$

Question $4(25$ Marks$)$

A$.$ Consider the following set of processes, with the length of the CPU burst given in milliseconds:

$\backslash$table$[[$Process$,$Burst Time,Priority$],[$P$1,10,3],[$P$2,1,1],[$P$3,2,3],[$P$4,1,4],[$P$5,5,2]]$

The processes are assumed to have arrived in the order $P1,P2,P3,P4,P5$ all at time $0.$

i$.$ Draw four Gantt charts that illustrate the execution of these processes using the following scheduling algorithms: FCFS$,$ SJF$,$ non$-$preemptive priority $($a smaller priority number implies a higher priority$),$ and $RR($quantum $=1).$

$10$ Marks

ii$.$ What is the turnaround time of each process for each of the scheduling algorithms in part $i?$

$5$ Marks

iii. What is the waiting time of each process for each of these scheduling algorithms?

$5$ Marks

iv$.$ Which of the algorithms results in the minimum average waiting time $($over all processes$)?$

$5$ Marks