[SPRING 2014] ASSIGNMENT
PROGRAM - BSc IT
SEMESTER - SECOND
SUBJECT CODE & NAME -
BT0070, Operating Systems
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– 4 BK ID - B0954 MAX. MARKS - 60
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Q. No.1
List the approaches to design operating system structures. Explain any two of
them. 2+8=10
Answer:
Listing
of approaches to design operating system structures:
Ø Layered
approach
Ø The
kernel based approach
Ø The
virtual machine approach
2 Write
short notes on:
1.
Process Creation
2.
Terminating Process 5+5= 10
Answer:
1. Process Creation
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
3 Is it
possible to check the condition of mutual exclusion through hardware
assistance? If yes, how? 10
Answer:
Checking
for mutual exclusion is also possible through hardware. Special instructions
called Test and Set Lock (TSL) is used for the purpose. An important feature is
that the set of instructions used for this purpose is indivisible, that is,
they cannot be interrupted during execution. The instruction has the format TSL
ACC, IND where ACC is an accumulator register and IND is a memory location used
as a flag.
Q4
|
1.
Given a total of 5 units of resource type 1 and 4 units of resource type 2,
tell whether the following system is in a safe or unsafe state. Show your
work.
Type
1 Type 2
Process
Used Max Used Max
P1 1 2
1 3
P2 1 3
1 2
P3 2 4
1 4
2.
|
5. What
is the concept of virtual memory? Why virtual memory is needed? 3+7= 10
Answer:
Virtual memory is a technique that allows execution of
processes that may not be entirely in memory. In addition, virtual memory
allows mapping of a large virtual address space onto a smaller physical memory.
It also raises the degree of multi-programming and increases CPU utilization.
Because of the above features, users are freed from worrying about memory
requirements and availability.
6 What
do you mean by Global OS? State the concept of migration and resource
allocation in Global OS.
4+6= 10
Answer:
Global Operating System (GOS)
The NOS is responsible for activities such as
memory and process management on the server. The NOS converts a request into a
task, schedules and executes it. Memory and processing power in all other
computers in the network is not tapped to the maximum by a NOS. This is exactly
what the GOS attempts to do. It has a list of processes executing on different
machines and the resources needed by each one of
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