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DBMS by Love Babbar


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UNIT 1
AN INTRODUCTION TO OPERATING SYSTEMS
Application software
performs specific task for the user.
System software operates and controls the computer system and provides a platform to run
application software.
An
operating system is a piece of software that manages all the resources of a computer
system,both hardware and software, and provides an environment in which the user can
execute his/her programs in a convenient and efficient manner by hiding underlying
complexity of the hardware and acting as a resource manager.
Why OS?
1. What if there is no OS?
a. Bulky and complex app. (Hardware interaction code must be in app’s
code base)
b. Resource exploitation by 1 App.
c. No memory protection.
2. What is an OS made up of?
a. Collection of system software.
An operating system function -
- Access to the computer hardware.
- interface between the user and the computer hardware
- Resource management (Aka, Arbitration) (memory, device, file, security, process etc)
- Hides the underlying complexity of the hardware. (Aka, Abstraction)
- facilitates execution of application programs by providing isolation and protection.
User
Application programs
Operating system
Computer hardware
The operating system provides the means for proper use of the resources in the operation of
the computer system


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