Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Amity School of Engineering & Technolo Technolo Sign up to vote on this title
B.Tech (CSE)/B.Tech(IT)
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Text/ Reference Books Text Books: Sign up to vote on this title th
ilber ersc scha hatz tz A. , Galv Galviin P.B., .B., Ope Operating ing System Con Concep cepts, 7 ed. (2 Silb Useful Not useful Will Wi lley ey & So Sons ns.I .INC NC
Operatin ting g Syst System em Concep Concepts ts Milenekovic, Opera
4nd ed.(2002), McGraw Hill
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Module I: Introduction to operating system Operating system and function Evolution of operating system:
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– Batch
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
What is an Operating System?
The collection of software which administers, mainta
provides access to the resources of a computer system, Sign up to vote on this title the Operating system. Useful Not useful You're Reading a Preview
It is the one of the type of system software
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Well known Example of Operating System:
Windows XP Professional (or Home) Editi Sign up to vote on this title
Windows Vista,
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Operating system goals: Execute
user programs and make solvin Sign up to vote on this title problems easier. Useful Not useful You're Reading a Preview
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Computer System Structure
Computer system can be divided into four compon –
Hardware – provides basic computing resource •
–
CPU, memory, I/O devices
Operating system •
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Controls and coordinates use of hardware among You're Reading a Preview
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Computer System Structure(contd..) : Four Components of a Comp
User 1
User 2
User 3
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Technical definition of OS •
Sign up to vote on this title Resource allocator – manages and al Useful Not useful resources.
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
The working of Operating System
OS is a program that manages a computer's res Sign up to vote on this title
and performs basic tasks. Some of the working Useful Not useful are as follows: You're Reading a Preview
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The working of Operating System(continued..) Sign up to vote on this title
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Important Term: Kernel It is a program which runs every time till the machin Sign up to vote on this title
computers) is in active mode
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As compare to other application programs, You're Reading a Preview kernel always lies
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Important Term: Interrupt (continued..)
So, we can say, that, Interrupting is a mechanism by whi
the normal seque modules (I/O, memory) may interrupt Sign up to vote on this title the processor (CPU) . Useful Not useful processor utilization. Interrupts help to improveYou're Reading a Preview
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Main Functions of an OS
Command Interpretation or User Interface Sign up to vote on this title
Process Management
Not useful Protection and Security
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Main Functions of an OS (continued…)
Process Management
As we know OS controls the execution of applications. Sign up to vote on this title
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Application (software) is made up by set of programs. You're Reading a Preview
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Main Functions of an OS (continued…)
Memory Management
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Memory is important resource of a computer syst
b
l
You're Reading a Preview
d f
h
ll
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Memory Levels: CPU Accessing
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Main Functions of an OS (continued…): File Manage A file is a collection of related information. Every file has a data and attributes
File’s name uniquely identifies the file in the system and is used by
access itself Sign up to vote on this title
File’s data is the available as contents found in the file
File’s attributes contain information such as
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Main Functions of an OS (continued…)
Device (I/O) Management
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to computer Manages and controls devices attached Useful Not useful
and software techniqu Handles devices by both hardware You're Reading a Preview
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Main Functions of an OS (continued…): SECURITY
Security deals with protecting the various resources and inf of a computer system against destruction and unauthorized ac
External security: Deals with securing computer against exter such as fires, floods, earthquakes, stolen disks/tapes, etc. by Sign up to vote on this title adequate backup, using security guards, allowing access to sensitive in Useful Not useful to only trusted employees/users, etc. You're Reading a Preview
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
Main Functions of an OS (continued…)
Command Interpretation: It provides a set of com Sign up to vote on this title Not useful Useful to using which the user can give instructions the compu getting some job done byYou're it Reading a Preview
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Amity School of Engineering T B.Tech.(CSE) & B.Tech (IT) 3
