Skip to main content

Functions of Operating System

 

Functions of operating system

 

5.                   protection and security :

·                     another important functions of an operating system is to protect itself from the user process and to protect different users processes from one another in a syatem.

·                     In a multi programming environment, where several users process reside in main memory at the same time, the may interface with OS or with each other.

·                     Thus, protection mechanism controls the access of users, programs and processes used by various applications.

·                     A total approach to computer security involves both external and internal security.

 

6.                   Networking:

·         Networking is used for exchanging  information among different computer that are distributed across various location.

·         Distributed system consist of multiple processors and each processor has its own memory and clock

·         This results in computer speedup, increased functionality, increased data availability and better reliability.

·         Thus, a distributed system enables us to share the various resources of the network.

 

7.                   Command interpretation:

·         The command interpreter is the basic interface between the computer and the user.

·         There are to different user interface supported by operating system:

1.       Command line interface

2.       Graphical user interface

·                     Command line interface . it is the textual user interface on which user gives instruction to computer by typing the command.

·                     Graphical user interface . GUI provide the user a screen full of graphical icons or menus and allows the user to make a rapid selection from the displayed icons or menus to give instruction to computer.

·                     The various command supported by command interpretations module are known as system calls.

Comments

Post a Comment

Popular posts from this blog

Multitasking System

  Multitasking system ·           Technically , multitasking is same as multi programming ·           In a multitasking operating system, s single user can execute multiple programs at the same time ·           We can also say, multitasking is the system capability to work on more than one job or process at the same time. ·           It means that whenever a job needs to perform I/O operation, the cpu can be used for execting some other job                                                        diagram of multi tasking     ·           There are two type of multitasking : 1.       ...
Post a Comment
Read more

Service provided By An Operating System.

  List of five service provided by an operating system. Explain how  each provides convenience to users?     The main purpose of operating system is to provide environment for the execution of programs. Thus an operating system provides certain services to program and the users of those programs. However , different operating system can provide different set of service. Some of the basis services provided by operating system are: 1.         Program execution ·          Operating system provides a convenient environment where users can run their programs ·          The operating system performs memory allocation to programs, load them into appropriate location so that they can execute. The users need not to worry about all these tasks.   2.         I/O Operation ·        ...
Post a Comment
Read more

Multi user Operating System

  Multi user operating system ·           In a multi-user operating system, multiple number of user can access different resources of a computer at a same time. ·           The access is provided using a network that consists of various personal computer attached to a mainframe computer system.                                                              diagram of multi -user operating system       ·           The various personal computer can send and receive information to mainframe computer system. ·           The example    of multi-user OS are UNIX, windows 2000,novell netware.            sing...
Post a Comment
Read more

Application Of Threads

  Application Of Threads This section discuss various implementation of threads. Multithreading concepts are implemented by pthread (POSIX standard), solaris, linux, window 2000 and java. 1. POSIX THREAD(Pthreads) ·          Pthread refers to the POSIX standard(IEEE 1003.IC) that defines an API for thread creation and sychronisation. ·          Prior to the of POSIX THREADS, each hardware vendor implemented their own version of threads. ·          As each implemented from the other, writing portable multithreaded application was difficult. Thus POSIX standardize the API for thread management. ·          The current Pthread API is defined only for C programming language and it is implemented as function with a header file Pthread.h and thread library. ·          The naming...
Post a Comment
Read more

Multi Programming Operating System

  Multi programming  system ·           Multi programming operating system allows multiple users to execute multiple programs using a single CPU concurrently i.e. at the same time. ·           In multiprogramming several process are kept in the main memory and CPU execute all these processes concurrently. It means, the CPU immediately switches from one process to next that are ready to get executed ·           In such an operating system when one process start process start performing the instructions from several programs at the same time. ·           Rather, it means that there are number program available to CPU and that portion of one is executed, then segment of another and so on                                 ...
Post a Comment
Read more