Operating Systems Complete Study Notes: Diagrams, Flow Charts, Examples & Interview Questions (PDF)

Learn Operating Systems the easy way with this 22-page illustrated study guide. Each topic has a clear explanation, a diagram or flow chart, a friendly analogy and a real-world example, so concepts stay in your head. It is written for exams, placements and technical interviews.

What's inside

OS basics: functions, kernel, user mode vs kernel mode, system calls

Types of operating systems: batch, time-sharing, real-time, distributed, embedded and mobile

OS structures: monolithic, layered, microkernel and hybrid

Processes: states, PCB, context switch, IPC

CPU scheduling: FCFS, SJF, SRTF, Priority, Round Robin, with worked examples and Gantt charts

Threads and multithreading

Process synchronization: race conditions, critical section, semaphores, producer-consumer

Deadlocks: Coffman conditions, resource allocation graph, Banker's algorithm, dining philosophers

Memory management: fragmentation, paging, TLB, segmentation

Virtual memory: page fault flow chart, thrashing, FIFO/LRU/Optimal pag