OPERATING SYSTEM
An operating
system (OS) is a layer of software on a bare hardware machine that performs two
basic functions:
(a) Resource Management.
(b) Virtual machine management (User friendliness).
Resource management
A user
process accesses several hardware and software resources during its execution:
Examples of
resources are CPU, Main Memory, input-output devices and various types of
software resources such as compiler, linker, loader, files etc. It is the OS
that manages the reourcesand allocates them to user in an efficient and fair
manner.
Virtual Machine Management
An operating system (OS) hides the
unpleasant, low-level details and idiosyncrasies of a bare hardware machine and
provides users with a much friendlier interface to the machine. To load,
manipulate, print and execute programs, high level commands can be used without
the inconvenience of worrying about low-level details.
The layer of an operating system
transform a bare hardware machine into a virtual machine with added
functionality such as automatic resource management.
by luv yadav
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