Operating System Tutorial

Operating System Tutorial Types of Operating System Evolution of Operating System Functions of Operating System Operating System Properties Operating System Services Components of Operating System Needs of the Operating System

Operating Systems

Linux Operating System Unix Operating System Ubuntu Operating System Chrome Operating Systems Fedora Operating System MAC Operating System MS Windows Operating System Solaris Operating System Cooperative Operating System CorelDRAW Operating System CentOS FreeBSD Operating Systems Batch Operating System MS-DOS Operating System Commercial Mobile Operating Systems


Difference Between Multi-programming and Multitasking Difference between C-LOOK and C-SCAN Difference between Rotational Latency and Disk Assess Time Trap vs Interrupt Difference between C-SCAN and SSTF Difference between SCAN and FCFS Difference between Seek Time and Disk Access Time Difference between SSTF and LOOK Difference between Process and Program in the Operating System Difference between Protection and Security in Operating System

How To

How to implement Monitors using Semaphores How to Install a Different Operating System on a PC


What is Kernel and Types of Kernel What is DOS Operating System What is Thread and Types of Thread What is Process Scheduler and Process Queue What is Context Switching What is CPU Scheduling What is Producer-Consumer Problem What is Semaphore in Operating System Monitors in Operating System What is Deadlock What is Paging and Segmentation What is Demand Paging What is Virtual Memory What is a Long term Scheduler What is Page Replacement in Operating System What is BSR Mode What is Convoy Effect What is Job Sequencing in Operating System Why is it critical for the Scheduler to distinguish between I/O-bound and CPU-bound programs Why is there a Need for an Operating System


Process Management Process State Scheduling Algorithm FCFS (First-come-First-Serve) Scheduling SJF (Shortest Job First) Scheduling Round-Robin CPU Scheduling Priority Based Scheduling HRRN (Highest Response Ratio Next) Scheduling Process Synchronization Lock Variable Mechanism TSL Mechanism Turn Variable Mechanism Interested Variable Mechanism Deadlock Avoidance Strategies for Handling Deadlock Deadlock Prevention Deadlock Detection and Recovery Resource Allocation Graph Banker’s Algorithm in Operating System Fixed Partitioning and Dynamic Partitioning Partitioning Algorithms Disk Scheduling Algorithms FCFS and SSTF Disk Scheduling Algorithm SCAN and C-SCAN Disk Scheduling Algorithm Look and C-Look Disk Scheduling Algorithm File in Operating System File Access Methods in Operating System File Allocation Method Directory Structure in Operating System N-Step-SCAN Disk Scheduling Feedback Queue in Operating System Contiguous Memory Allocation in Operating System Real-time Operating System Starvation in Operating System Thrashing in Operating System 5 Goals of Operating System Advantages of Operating System Advantages of UNIX Operating System Bit Vector in Operating System Booting Process in Operating System Can a Computer Run Without the Operating System Dining Philosophers Problem in Operating System Free Space Management in Operating System Inter Process Communication in Operating System Swapping in Operating System Memory Management in Operating System Multiprogramming Operating System Multitasking Operating Systems Multi-user Operating Systems Non-Contiguous Memory Allocation in Operating System Page Table in Operating System Process Scheduling in Operating System Segmentation in Operating System Simple Structure in Operating System Single-User Operating System Two Phase Locking Protocol Advantages and Disadvantages of Operating System Arithmetic operations in binary number system Assemblers in the operating system Bakery Algorithm in Operating System Benefits of Ubuntu Operating System CPU Scheduling Criteria in Operating System Critical Section in Operating System Device Management in Operating System Linux Scheduler in Operating System Long Term Scheduler in Operating System Mutex in Operating System Operating System Failure Peterson's Solution in Operating System Privileged and Non-Privileged Instructions in Operating System Swapping in Operating System Types of Operating System Zombie and Orphan Process in Operating System 62-bit operating system Advantages and Disadvantages of Batch Operating System Boot Block and Bad Block in Operating System Contiguous and Non - Contiguous Memory Allocation in Operating System Control and Distribution Systems in Operations Management Control Program in Operating System Convergent Technologies in Operating System Convoy Effect in Operating System Copy Operating Systems to SSD Core Components of Operating System Core of UNIX Operating System Correct Value to return to the Operating System Corrupted Operating System Cos is Smart Card Operating System Cosmos Operating Systems Examples Generation of Operating System Hardware Solution in Operating System Process Control Block in Operating System Function of Kernel in Operating System Operating System Layers History of Debian Operating Systems Branches and Architecture of Debian Operating Systems Features and Packages of Debian Operating Systems Installation of Operating System on a New PC Organizational Structure and Development in Debian Operating Systems User Interface in Operating System Types Of Memory in OS Operating System in Nokia Multilevel Paging in OS Memory Mapping Techniques in OS Memory Layout of a Process in Operating System Hardware Protection in Operating System Functions of File Management in Operating System Core of Linux Operating System Cache Replacement Policy in Operating System Cache Line and Cache Size in Operating System What is Memory Mapping? Difference Between Network Operating System And Distributed Operating System What is the difference between a Hard link and a Soft Link? Principles of Preemptive Scheduling Process Scheduling Algorithms What is NOS? What is the Interrupt I/O Process? What is Time Sharing OS What is process termination? What is Time-Sharing Operating System What is Batch File File system manipulation What is Message-passing Technique in OS Logical Clock in Distributed System

5 Goals of Operating System

An Operating System (OS) is system software that acts as an interface or bridge between the hardware of a computer and the end user.

Operating System reduces the communication barrier between the user and the system and helps the user to communicate easily with the computer.

Every computer system requires an operating system to run its applications and programs. Applications like Browsers, MS Office, Notepad, Games, and many more require some space or can be an atmosphere to perform their tasks.

This operating system is an essential need or requirement of a system such as a laptop, computer, iPad, mobile phone, etc. With OS, the user can communicate and perform any task on the system.

5 goals of operating system

Examples of Operating Systems

There are various types of operating systems which are available in the market:

  • Windows
  • Android
  • iOS
  • Mac OS
  • Linux
  • Chrome OS
  • Windows Phone OS

Goals of Operating System

There are mainly 2 goals of the operating system:

  • Convenience
  • Efficiency

The other 3 goals are:

  • Portability and Reliability
  • Hardware Abstraction
  • Security

1. Convenience

An Operating System's primary and first goal is to provide a friendly and convenient environment to the user. It is optional to use Operating System. Still, things become harder when the user has to perform all the process scheduling and convert user commands to machine language so that system can perform tasks. So, we use an Operating System to act as a bridge between us and the computer hardware. We only have to give commands to the system, and OS will take the instructions and do the rest of the work. Because of this operating system should be convenient to use and operate by the user.

2. Efficiency

The second and important goal of an Operating System is efficiency. An operating system should utilize all the resources efficiently. The management of resources and programs should be done so that no resource is kept idle and memory is used for no use.

3. Portability and Reliability

The operating system can work/operate on different machines with different processors and memory configurations. This makes the operating system more reliable.

Also, the operating system can protect itself and the user from accidental damage from the user program.

4. Hardware Abstraction

The operating system can conceal or can be said to control all functions and resources of the computer. The user can give commands and access any function or resource of the computer without facing any difficulties. In this way, the Operating system communicates between the user and computer hardware.

5. Security

An operating system provides the safety and security of data between the user and the hardware. OS enables multiple users to securely share a computer(system), including files, processes, memory, and device separately.

Functions of the Operating System

5 goals of operating system

To achieve the goals of an Operating system, the Operating System performs several functionalities, which are:

  • Process ManagementThe CPU executes many instructions for users at a time. Besides, user's commands, the CPU has some of its activities to perform, called processes. CPU has to complete all the tasks assigned to it. So, it solves the problem by giving a certain amount of time to a particular task. The operating system's function is to create and delete both user and system processes that are being executed or do not need to execute them.
  • Memory Management: Various tasks and commands fetched by the CPU are stored in the memory for execution. The operating system keeps track of which part of the memory is currently being used. Allocating and de-allocating the memory as per need. And decides which process should be loaded in the memory when it is available.
  • I/O Device Management: Various I/O devices are present in a system. Only OS has access to these devices. So, the Operating System must allow the use of I/O devices by the various processes requiring these resources.
  • File Management: There are various files, folders, and directory systems in a particular computer. Computers can store the files in magnetic tape, hard disk, local folder, etc. The operating system manages all these. The function of the OS is to create and delete files and folders. Mapping of files and directories to the disk. Backing up data to non-volatile memory.
  • Virtual Memory: Operating system loads some of the files, programs, and applications that are larger than the main memory in a memory which is called virtual memory.
  • Job Accounting: Job Accounting is a system available in the operating system that helps track system resource usage. It keeps track of the time and resources used by various processes and users.