Explain Need Of Operating System, Function Of Operating system.
Need Of Operating System
• The operating system provides access to a number of
resources, directly or indirectly, such as files on a local
disk.
• The operating system is capable of distinguishing
between some requestors of these resources who are
authorized to access the resource, and others who are not
authorized.
• Many operating systems allow the user to install or
create any user interface they desire.
• A device driver is a specific type of computer software
developed to allow interaction with hardware devices.
Function Of Operating system
An operating system manages four major resources of the
computer system :- memory, input/output devices, processors
and files.
So an operating system provides four operations: -
1. Memory Management Function : - finds free space in
memory and allocate it to different processes.
2. Processor Management Function : - allocates the processor
to executes a chosen process.
3. I/O devices Management Function : - allocates a device to a
process.
4. File Management Function : - keeps track of all
information's about files that how they are opened or
closed.
Process :- A process is a program at the time of its execution.
Sometimes it is called task.
Jobs : - A job is a collection of activities needed to do the
required work. A job can be divided into smaller steps named
job steps and they have to be executed sequentially.