Computer Science Interview Preparation
Operating Systems
Complete Learning Guide
Learn how operating systems manage processes, memory, files, concurrency, and hardware. Follow a structured path from core concepts to advanced topics and prepare for computer science interviews with confidence.
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Topics to Explore
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Learning Categories
4
Learning Stages
Your Learning Roadmap
Study the concepts in order. Build a strong foundation before moving to synchronization, memory internals, and advanced systems.
01
Understand the Basics
OS fundamentals, processes, threads, and system calls.
02
Master Concurrency
Scheduling, synchronization, and deadlocks.
03
Learn Resource Management
Virtual memory, files, storage, and I/O.
04
Go Beyond the Basics
Security, virtualization, and distributed systems.
Operating System Topic Index
Search a concept or browse the categories. Start with fundamentals and progress at your own pace.
1. Operating System Fundamentals Core terminology, architecture, kernels, and how an OS works.
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What Is an Operating System?
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Functions and Responsibilities of an OS
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Types of Operating Systems with Examples
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What Is a Kernel? Monolithic vs Microkernel
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User Mode vs Kernel Mode
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CPU Architecture and the Instruction Cycle
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CPU Cores vs CPU Threads vs Program Threads
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Multitasking vs Multiprocessing vs Multithreading
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Multiprogramming vs Multitasking
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Pipelining: Concepts and Examples
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Process Memory Space and Resources
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System Calls, Interrupts, and Exceptions: Overview
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2. Processes and Threads Process lifecycle, thread models, creation, and context switching.
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What Is a Process?
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Process States and State Transitions
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Process Control Block (PCB)
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Process Queues and OS Schedulers
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Program vs Process
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Process Creation and Termination
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fork(): Process Creation in Unix/Linux
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Normal Function Call vs System Call
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Process vs Thread
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User-Level vs Kernel-Level Threads
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Multithreading Models
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Thread Pools and Process Pools
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Connection Pooling: Concepts and Trade-offs
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Context Switching and Its Overhead
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3. CPU Scheduling Algorithms Scheduling criteria, numerical problems, starvation, and fairness.
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CPU Scheduling: Introduction and Criteria
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Arrival, Burst, Completion, Waiting, and Turnaround Time
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First Come First Served (FCFS)
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Shortest Job First (SJF)
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Shortest Remaining Time First (SRTF)
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Longest Remaining Time First (LRTF)
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Priority Scheduling: Preemptive and Non-Preemptive
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Round Robin Scheduling
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Highest Response Ratio Next (HRRN)
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Multilevel Queue Scheduling
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Multilevel Feedback Queue Scheduling
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Starvation and Aging
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Dispatcher and Dispatch Latency
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4. Process Synchronization and IPC Race conditions, critical sections, semaphores, and concurrency problems.
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Inter-Process Communication (IPC)
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Shared Memory vs Message Passing
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Process Synchronization: Introduction
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Race Conditions and Critical Sections
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Critical Section Problem and Its Requirements
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Peterson’s Solution
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Hardware Synchronization: Test-and-Set and Atomic Operations
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Disabling Interrupts for Synchronization
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Mutex vs Semaphore
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Binary vs Counting Semaphore
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Sleep and Wakeup Synchronization
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Producer-Consumer Problem Using Semaphores
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Readers-Writers Problem
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Dining Philosophers Problem
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Concurrent Programming: Parbegin-Parend and Fork-Join
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Condition Variables and Monitors
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5. Deadlocks Necessary conditions, prevention, avoidance, detection, and recovery.
6. Memory Management Address translation, paging, segmentation, virtual memory, and allocation.
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Memory Management: An Overview
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Memory Hardware: Registers, Cache, RAM, and Storage
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Logical vs Physical Address
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Compile-Time, Load-Time, and Execution-Time Binding
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Program Linking and Loading
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Contiguous Memory Allocation
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Fixed vs Variable Partitioning
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First Fit vs Best Fit vs Worst Fit
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Internal vs External Fragmentation
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Paging: Pages, Frames, and Address Translation
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Page Tables and Page Table Entries
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Multilevel Paging and Hashed Page Tables
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Translation Lookaside Buffer (TLB)
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Segmentation in Operating Systems
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Paging vs Segmentation
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Virtual Memory: Concepts and Benefits
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Demand Paging and Lazy Loading of Pages
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Page Fault: Causes and Handling
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Page Replacement Algorithms: FIFO, LRU, and Optimal
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Belady’s Anomaly
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Thrashing and Working-Set Model
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Copy-on-Write (COW)
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Overlays in Memory Management
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7. File Systems and Disk Management Files, directories, allocation, disk scheduling, and file-system internals.
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What Is a File System? Components and Responsibilities
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Files, Directories, Paths, and File Metadata
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Types of File Systems: FAT, NTFS, ext4, and More
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File Allocation: Contiguous, Linked, and Indexed
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File System Implementation and Metadata
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Inodes, File Descriptors, and File Metadata
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Journaling File Systems
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Disk Free-Space Management
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HDD vs SSD and Disk Structure
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Disk Scheduling: Introduction and Goals
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FCFS, SSTF, SCAN, C-SCAN, LOOK, and C-LOOK
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How a File Is Read from Disk into Memory
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8. I/O Systems and Device Management Device drivers, interrupts, DMA, buffering, and asynchronous operations.
9. System Calls and APIs How applications request operating-system services.
10. Storage, Protection, and Security RAID, access control, authentication, and operating-system security.
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RAID and Its Levels: RAID 0, 1, 5, 6, and 10
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Protection vs Security in Operating Systems
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Authentication vs Authorization
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Access Control and Permissions
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Principle of Least Privilege
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Security Threats and Vulnerabilities
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Encryption vs Hashing
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Security Policies and Access Rights
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11. Advanced Operating System Concepts Virtualization, distributed systems, cloud concepts, and Linux internals.
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Virtualization and Virtual Machines
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Type 1 vs Type 2 Hypervisors
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Containers vs Virtual Machines
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Networked vs Distributed Operating Systems
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Distributed File Systems
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Remote Procedure Call (RPC)
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Cloud Computing: OS Concepts and Fundamentals
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Linux Process Management Basics
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Useful Linux System and Networking Commands
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No matching topics found
Try another keyword or clear the search to see all topics.
Preparing for Operating System Interviews?
If you’re short on time, prioritize process vs thread, CPU scheduling, context switching, process synchronization, mutex vs semaphore, deadlocks, paging, virtual memory, page replacement, system calls, and file systems. Be ready to explain each concept with an example and solve numerical problems where applicable.
Process vs Thread
CPU Scheduling
Context Switching
Mutex vs Semaphore
Deadlocks
Banker’s Algorithm
Paging & TLB
Virtual Memory
Page Replacement
System Calls
File Systems
Process Synchronization