OPERATING SYSTEM (OS)

OPERATING SYSTEM (OS)

1. Types of operating system

   • Single and multi-user
     • A multi-user operating system extends the basic concept of multi-tasking with facilities that identify processes and resources, such as disk space, belonging to multiple users, and the system permits multiple users to interact with the system at the same time
   • Single and multitasking
     • A single-tasking system can only run one program at a time, while a multi-tasking operating system allows more than one program
   • Distributed
     • A distributed operating system manages a group of distinct computers and makes them appear to be a single computer
   • Templated
     • In an OS, distributed and cloud computing context, templating refers to creating a single virtual machine image as a guest operating system, then saving it as a tool for multiple running virtual machines
   • Enebelded
     • Embedded operating systems are designed to be used in embedded computer systems. They are designed to operate on small machines like PDAs with less autonomy. They are able to operate with a limited number of resources. They are very compact and extremely efficient by design. Windows CE and Minix 3 are some examples
   • Real-time
     • A real-time operating system is an operating system that guarantees to process events or data within a certain short amount of time. A real-time operating system may be single- or multi-tasking, but when multitasking, it uses specialized scheduling algorithms so that a deterministic nature of behavior is achieved
   • Library
     • A library operating system is one in which the services that a typical operating system provides, such as networking, are provided in the form of libraries. These libraries are composed with the application and configuration code to construct unikernels — which are specialised, single address space, machine images that can be deployed to cloud or embedded environments.

2. What is a OS ?

   • An (OS) is system software that manages computer hardware and software resources and provides common services for computer programs.The operating system is a component of the system software is a comouter system

3. OS functions.

   • 1- It manages the hardware and software resorces of the system. In a desktop computer , thse resources include such things as the processor, memory, disk, space and more.
   • 2- It provides a stables, cosist way for applications to deal wit the hardware without having to know all the deals of the hardware

4. OS developments

   • For desktop systems, acces to a LAN or the Internet has become such an expected feature that is many ways it's hard to descoss an operating system without making references to its connections to other computers and servers. Operating system developers have made the Internet the standard method for delivering crucial operationg system updates via CD or DVD

5. How it works ?

   • It sets up the divisions of memory that hold the operating system, user information and applications. It establishes the data structures that will hold the myriad signals, flags and semaphores that are used to communicate within and between the subsystems and applications of the computer. Then it turns control of the computer over to the operating system.