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Spring
2016
Bca2010
1 List three
main responsibilities of an operating system. Explain about Multi-processor
Operating Systems.
Answer: An operating
system has three main responsibilities:
1.
Perform basic tasks, such as recognizing input from
the keyboard, sending output to the display screen, keeping track of files and directories
on the disk and controlling peripheral
2 Differentiate
between a Process and a Program.
Answer: A program in execution is a
process. A process is executed sequentially, one instruction at a time. A
program is a passive entity. Example: a file on the disk. A process on the
other hand is an active entity. In addition to program code, it includes the
values of the program counter, the
3 Define
Threads. What are the advantages and disadvantages of Threads over
Multiprocessors?
Answer: Thread is a
single sequence stream which allows a program to split itself into two or more
simultaneously running tasks. It is a basic unit of CPU utilization, and
consists of a program
4 Define
deadlock. Discuss any four conditions that leads to deadlock.
Answer: Deadlock occurs when we have
a set of processes [not necessarily all the processes in the system], each
holding some resources, each requesting some resources, and none of them is
able to obtain what it needs, i.e. to make progress. We will usually reason in
terms of resources R1, R2..
5 Define
Critical-Section problem. What are the three requirements that a critical
section problem need to satisfy?
Answer: 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.
6 Write short
notes on:
a) Segmentation
b) External
fragmentation
Answer: a) Memory management using
paging provides two entirely different views of memory – User / logical /
virtual view and the actual / physical view. Both are not the same. In fact,
the user’s view
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