Operating Systems
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The document discusses operating systems and their functions. An operating system controls the entire operations of a computer by providing an environment for users to execute programs and acting as an interface between the user and hardware. It has two main objectives - managing hardware and providing an interface. The document then describes different types of operating systems including batch processing, multi-user, single-user, multi-tasking, real-time, multi-processing, and multi-threading operating systems. It concludes by listing some of the main functions of an operating system such as process management, memory management, file management, device management, security management, and providing a user interface.
Operating Systems
- 2. OPERATING SYSTEM • A set of system programs that control the entire operations of the computer. • Provides an environment for the user to execute programs. • Acts as an interface between a user of a computer and the computer hardware. • Has 2 objectives – Managing the hardware – Providing an interface • Examples – MS DOS, Windows XP, Windows 7, LINUX, UNIX etc.
- 3. LAYERS OF COMPUTER SYSTEM
- 4. TYPES OF OS • A Batch processing system – A Executes only one job (batch) at a time. – Collects similar jobs called batch and put them into a queue. – OS is responsible for scheduling the jobs according to priority .
- 5. TYPES OF OS • Multi user operating system – Allows more than one user can use the same data and application programs at the same time. – Another term for multi-user is time sharing. – Eg: Linux, Unix, Windows NT
- 6. TYPES OF OS • Single user operating system – Allows a single user to perform only one task at a time. – Eg: MS DOS.
- 7. TYPES OF OS • Multi tasking operating system – Allows multiple jobs to be executed concurrently. – Multiple jobs are executed by switching the CPU between them. – Eg: UNIX, Windows.
- 8. TYPES OF OS • Real time operating system (RTOS) • Designed to respond to an event within a predefined time.
- 9. TYPES OF OS • Multi processing operating system – Can incorporate more than one processor dedicated to running processes. – Improves overall performance of the system.
- 10. TYPES OF OS • Multi threading operating system – A form of multi tasking. – Allows multiple parts of a software program to be run simultaneously.
- 11. FUNSTIONS OF OS • Process management • Memory management • File management • Device management • Security management • User interface