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Introduction to Operating System

Permanent Linkby 13745 on Mon Mar 30, 2015 1:58 pm

Introduction to Operating system

OPERATING SYSTEM:

Definition:-
Operating system is software that works as an interface between a user and the computer hardware.

Example:-
There are following some examples of OS.
a) UNIX
b) LINUX
c) MS-DOS
d) MS WINDOWS -98/XP/Vista
e) Windows NT/2000,
f) Window 7 & 8 etc.



Explanation:-
•OS performs the basics tasks such as receiving input from keyboard, processing instructions and sending output to the screen.
•OS manages overall activities of computer and input/output devices attached to it.
•It is software that is required in order to run application programs and utilities.
•It works as a bridge to perform better interaction between application programs and hardware of computer.
•It manages the sharing of internal memory among multiple applications.
•It sends messages to each application or interactive user about the status of operation and any errors that may have occurred.
•The primary objective of an OS is to make computer system convenient to use and to utilize computer hardware in an efficient manner.
•OS manages hardware and software resources of computer system such as processor, memory, disk space etc.

Types:-
There are following types of OS.

1)GUI:-
Graphical user interface operating system contains graphics and icons.
2) Multitasking:-
An operating system that is capable of allowing multiple software processes to run at the same time.
3) Multi-user:-
It allows for multiple users to use the same computer at the same time and different times.
4)Multiprocessing:-
An operating system capable of supporting and utilizing more than one computer processor.
5)Multithreading:-
OS that allows different parts of software program to run concurrently.
6)Embedded system:-
The OS designed to operate on small machines like PDAs with less autonomy. They are able to operate with a limited number of resources.
Last edited by 13745 on Tue Mar 31, 2015 4:12 pm, edited 2 times in total.

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RE: Introduction to Operating System

Permanent Linkby zia khan on Mon Apr 20, 2015 9:12 pm

BASICS OF OPERATING SYSTEM (14310)
Operating system is one of the most important program that runs on our computer system. It manages all other programs on the machine. It performs basic tasks such as
. Recognising input from the keyboard or mouse
. Sending output to the monitor
. Keeping track of files and directories on the disk
. Controlling peripheral devices such as disk drives and printers
Generally there are four types based on the type of computer they control and the sort applications they support they include are (1) single user, single task (2) multi-user, multi-task (3) real time operating systems (4) single user, multi-tasking. Operating systems provide a software platform on top of which other application programs can run. The application programs must be written to run on a particular operating system. Choice of operating system determines what application software you can run. Besides managing hardware and software resources on the system, the OS must change resources and memory. There are two broad tasks to be accomplished.
. Each process must have enough memory in which to execute. It can neither run into the memory space of another process nor be run into by another process. The different types of memory must be used properly so that each process can run most effectively.
In our computer system every operating system has FOUR central managers that work together in the form as like team of players. They include are
1 MEMORY MANAGER: It is like the head of the main memory. Checks every request from the memory and utilize if it is valid or not, allows the location of the memory space which is not to be allowed.
2 PROCESS MANAGER: Process the job which is under execution when we run any file in our computer. Brain of the computer system which is known as CPU (CENTRAL PROCESSSING UNIT) manages and controls each and every process.
3 DEVICE MANAGER: Monitors, every device which is connected with our computer system known as peripherals and the control unit are called the device. It changes the properties of our devices which are directly connected to our computer system.

4 FILE MANAGER: File manager checks every type of file that is in the system such TXT files and stored applications. It also gives permission to the user hence operate the required file. It tells us the file READ only or READ OR WRITE only.
5 NETWORK MANAGER: By networking users are able to share hardware and software resources. Network manager gives the security ensuring that network is protected from agent users. Making always be sure the network is available to users.
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