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About this document
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- 14 pages
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- Computer Science, Information Technology
This study guide covers the basics of operating systems, including their goals, components, and functions. It explains concepts like the kernel, bootstrap program, interrupts, and system calls. It is useful for understanding the fundamentals of operating systems.
What's inside
- Introduction to operating systems
- Goals and functions of an OS
- Kernel and bootstrap program
- Interrupts and system calls
- Multiprogramming and timesharing
Who it is for: Students studying operating systems. (Undergraduate)
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Summary
An operating system is a program that manages computer hardware and software. This guide explains what an operating system does, how it works, and the different ways it can manage processes and memory.
Introduction to Operating Systems
An operating system manages computer hardware and software. It executes user programs, makes the computer system easy to use, and utilizes hardware efficiently. It acts as an intermediary between users and the computer hardware.
Process Management
Process management involves scheduling and controlling the execution of processes. It includes multiprogramming, timesharing, and different scheduling algorithms like priority scheduling, round robin, and multilevel queues.
Memory Management
Memory management handles how memory is allocated and deallocated. It includes concepts like caching, multiprocessor systems, and different types of fragmentation. It also covers logical and physical memory division.
File System Organization
A file system organizes how data is stored and retrieved. It includes logical formatting, swap-space, RAID, and tertiary storage. It also covers file sharing systems and consistency semantics.
Key terms
- Kernel
- The core part of the operating system that runs at all times.
- Interrupt
- A signal to the processor emitted by hardware or software indicating an event that needs immediate attention.
- System call
- A request to the operating system to allow user to wait for I/O completion.
- Multiprogramming
- A method to keep the CPU busy by scheduling jobs so that the CPU always has one to execute.
- Dual-mode operation
- A mode of operation that allows the operating system to protect itself and other system components.
- Page table
- A data structure used by a virtual memory system that stores the mapping between virtual addresses and physical addresses.
Questions this document helps with
- What are the main goals of an operating system?
- How does process management work in an operating system?
- What is the difference between internal and external fragmentation?
Summary written with AI from the document's text.
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