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 page replacement with worked tables
• File systems: allocation methods, directories, permissions
• Disk scheduling: FCFS, SSTF, SCAN, C-SCAN, plus I/O management and security basics
• About 28 interview questions with short answers and 5 numerical practice problems