OPERATING
SYSTEM OVERVIEW
Objectives
and Functions
A program that is executed by the processor that frequently
relinquishes control and must depend on the processor to regain control.
· A program
that mediates between application programs and the hardware
· A set of
procedures that enable a group of people to use a computer system.
· A program
that controls the execution of application programs
· An
interface between applications and hardware
Functions
Usage
Computer
system
Control
Support
Usage
v Users of
a computer system:
v Programs
- use memory, use CPU time, use I/O devices
v Human
users
v Programmers
- use program development tools such as debuggers, editors end users - use
application programs, e.g. Internet explorer
Computer system
hardware
+ software
OS is a part of the computer
software, it is a program. It is a very special program, that is the first to
be executed when the computer is switched on, and is supposed to control and
support the execution of other programs and the overall usage of the computer
system.
Control
The operating system controls the
usage of the computer resources - hardware devices and software utilities. We
can think of an operating system as a Resource Manager. Here are
some of the resources managed by the OS:
·
Processors,
·
Main memory,
·
Secondary Memory,
·
Peripheral devices,
·
Information.
Support
The operating system provides a
number of services to assist the users of the computer system:
For the
programmers:
Utilities
- debuggers, editors, file management, etc.
For the
end users - provides the interface to the application programs
For programs - loads instructions and
data into memory, prepares I/O devises for usage, handles interrupts and
error conditions.
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