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[Fall 2014] ASSIGNMENT
PROGRAM BSc IT
SEMESTER SECOND
SUBJECT CODE & NAME BT0070,
Operating Systems
CREDIT
4 BK ID B0954 MAX. MARKS 60
Q. No. 1 Describe the mechanism of
process creation in an OS. 10 10
Answer:
During the course of execution, a
process may create several new proceses using a create-process system call. The
creating process is called a parent process and the new processes are called
the children of that process. Each of these new processes may in turn create
other processes, forming a tree of processes.
2 Suppose that the following
processes arrive for execution at the times indicated.
Process Burst Time
P1 24
P2 3
P3 3
1. Suppose the process arrives in
the order P1, P2, P3 and
2. Suppose the process arrive in
the order P2, P3, P1.
For both the above situation draw
the Gantt Chart and calculate the waiting time for each process and average
waiting time. 5+5 10
Answer:
1.
The Gantt chart below shows the
result
3 Write short notes on:
1. Critical section problem
2. Buffering 5+5 10
Answer:
1. The critical-section problem
A
critical-section is a part of program that accesses a shared resource
(data structure or device) that must not be concurrently accessed by more than
one process of execution. Consider a system consisting of n processes { p0,p1,……pn-1}.
Each process has a segment of code called a critical
4 What are TLBs? Why they are
required in paging? 3+7 10
Answer:
A
translation lookaside buffer (TLB) is a cache that memory management hardware
uses to improve virtual address translation speed. The majority of desktop,
laptop, and server processors
5 Describe the techniques of free
space management of free space list. 10 10
Answer:
The
disk is a scarce resource. Also disk space can be reused. Free space present on
the disk is maintained by the operating system. Physical blocks that are free
are listed in a free-space list. When a file is created or a file grows, requests
for blocks of disk space are checked in the free-
6 What are computer viruses? How do
they affect our system? 3+7 10
Answer:
A
computer virus is written with an intention of infecting other programs. It is a
part of a program that piggybacks on to a valid program. It differs from the worm
in the following ways:
Worm is a complete program by itself and can execute independently whereas
virus does not operate independently. Worm consumes only system resources but
virus causes direct harm to
Get fully solved assignment, plz drop a mail with your sub code
computeroperator4@gmail.com
Charges for mba rs 125/subject and rs 700/semester only.
For other rs 125/subject only
if urgent then call us
on 08791490301, 08273413412
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