Skip to main content

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

·         in order to execute a program,it usually requires an I/O operations. For example , it may need a file and print the output.

·         When all these I/O operation are performed users cannot I/O devices.

 

3.       File system manipulation

·         The execution of a program may involve reading data from or writing data to file . it may also require to create or delete a certain file.

·         The operating system provides all these operation and performs secondary storage management.

 

4.       Communication

·         The various process executing on a system

 

·         may have multiple execution flows, different once belonging to difficult threads.

 

Comments

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.       ...

Batch Processing Operating System

  Batch processing system ·           Batch processing is one of the oldest method    of running the programs ·           The computer in the past were very large in size and their I/O devices were very different from those that are used today. The job processing was not interactive as it is today. ·           The user did not interact directly with computer system.   ·           The process scheduling , memory management, file management and I/Omanagement functions are quite simple in batch processing system   1.         Process scheduling (i.e. allocation strategy for a processor is typically in order of their arrival i.e. first come first served(FCFS)basis.   2.         Memory management  is done by divi...

Monolithic Architecture

  Monolithic Architecture Monolith means composed all in one piece. The  Monolithic  application describes a single-tiered  software  application in which different components combined into a single program from a single platform. Components can be: Authorization — responsible for authorizing a user Presentation — responsible for handling HTTP requests and responding with either HTML or JSON/XML (for web services APIs). Business logic — the application’s business logic. Database layer — data access objects responsible for accessing the database. Application integration — integration with other services (e.g. via messaging or REST API). Or integration with any other Data sources. Notification module — responsible for sending email notifications whenever needed. Example for Monolithic Approach Consider an example of Ecommerce application, that authorizes customer, takes an order, check products inventory, authorize payment and ships ordered products. This applicat...

Change the priority of a process

  Change the priority of a process You can tell the computer that certain processes should have a higher priority than others, and so should be given a bigger share of the available computing time. This can make them run faster, but only in certain cases. You can also give a process a  lower  priority if you think it is taking up too much processing power. Go to the  Processes  tab and click on the process you want to have a different priority. Right-click the process, and use the  Change Priority  menu to assign the process a higher or lower priority. There is typically little need to change process priorities manually. The computer will usually do a good job of managing them itself. (The system for managing the priority of processes is called  nice .) Does higher priority make a process run faster? The computer shares its processing time between all of the running processes. This is normally shared intelligently, so programs that are doing more ...
 C omparison between real time and time sharing operating system P rotection and s ecurity  • Protection refers to a mechanism for controlling the access of program s processes, or users to the resources defined by computer system. • The concept of protection came with the advent of multiprogramming where several processes compete for the use of CPU. • the purpose was to confine each users program to its assigned areaof memory so that the programs cannot interface and harm each other. • Protection in main memory is particularly important because of address translation. The purpose of protection is to allow concurrently running process to share the common physical address space. • Protection also ensure that only process that have gained proper authorization from the operating system can operate on memory segment , the CPU, files and other resources.