Operating System
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An operating system (OS) is system software that manages hardware resources and provides an environment for users to run applications. Key functions of an OS include process management, memory management, file management, and providing security utilities. Various types of operating systems exist, including batch, time-sharing, and network operating systems, and multitasking enables the concurrent execution of multiple processes.
Operating System
- 2. THE DEFINITION OF AN OS WHERE COMES THE OS IN? A computer system consists of: User software System software Hardware User Applications Compilers Editors Shells Operating System System hardware
- 3. THE DEFINITION OF AN OS WHAT IS AN OS? A system software A collection of programs that: manage all the system’s hardware resources (the CPU, memory, I/O devices, etc.) of a computer system provide the users the environment in which they can: use the system resources run their own applications Two primary objectives of an OS are: Making a computer system convenient to use Managing the resources of a computer system
- 4. TYPES OF OS Basic types of OS are as follows: Batch operating system Time sharing operating system Network operating system Etc…
- 5. LOGICAL ARCHITECTURE OF A COMPUTER SYSTEM The operating system Computer layer hides the details of the hardware from the programmer and provides the programmer with convenient interface for using the system
- 6. BASIC TASK PERFORM BY OS An OS performs basic tasks, such as recognizing input from the keyboard, sending output to the display screen, keeping track of files and directories on the disk, and controlling peripheral devices such as printers
- 7. TASK SWITCHING In computing, multitasking is a concept of performing multiple tasks (also known as processes) over a certain period of time by executing them concurrently. New tasks start and interrupt already started ones before they have reached completion, instead of executing the tasks sequentially so each started task needs to reach its end before a new one is started. As a result, a computer executes segments of multiple tasks in an interleaved manner, while the tasks share common processing resources such as central processing units (CPUs) and main memory A multitasking OS allows you to run multiple processes (tasks) "simultaneously". They do not actually run at the same time, of course, since there is only one CPU.
- 8. MAIN FUNCTIONS OF AN OS Process management : creates, schedules and destroy processes Memory management: Allocates and releases memory File management: create, read, modify, remove etc. files Security
- 9. UTILITY SOFTWARE Utility software is system software designed to help analyze, configure, optimize or maintain a computer. Utility software, along with operating system software, is a type of system software used to support the computer infrastructure, distinguishing it from application software which is aimed at directly performing tasks that benefit ordinary users
- 10. EXAMPLES Antivirus software, as the name suggests, helps to protect a computer system from viruses and other harmful programs. Backup software helps in the creation of a backup of the files on your computer. Etc.