Question $1(30$ Marks$)$

i$)$ Briefly discuss the three main purposes of an operating system?

ii$)$ Discuss any three the five major activities of an operating system in regard to process

management?

iii$)$ What are two differences between user$-$level threads and kernel$-$level threads? Under

what circumstances is one type better than the other?

$(6$ Marks$)$

iv$)$ Suppose that a scheduling algorithm $($at the level of short$-$term CPU scheduling$)$ favours

those processes that have used the least processor time in the recent past. Why will this

algorithm favor I$/$O$-$bound programs and yet not permanently starve CPU$-$bound

programs?

$(6$ Marks$)$

v$)$ Describe three examples of deadlocks that are not related to a computer system

environment.

$(6$ Marks$)$