Learn Operating System concepts through clear explanations, examples, diagrams, algorithms and problem-solving resources.
An Operating System (OS) is system software that manages computer hardware and provides services to application programs. It coordinates resources such as the CPU, main memory, storage devices and input/output devices, while providing an environment in which programs can execute.
This tutorial series explains Operating System concepts in a structured way, beginning with fundamental ideas and progressing to process management, CPU scheduling, synchronization, deadlocks, memory management, virtual memory, file systems and disk scheduling.
Depending on the topic, the tutorials may include diagrams, step-by-step explanations, algorithms, examples, numerical problems and comparisons. Students can study the chapters in sequence or open a specific topic when revising a concept.
Start with the definition, purpose, components and working of the topic before moving to algorithms or calculations.
Use architecture, process-state, memory, file-system and scheduling diagrams where they help explain relationships and flow.
For numerical topics, follow the steps carefully and understand how each value is obtained.
After learning a topic, solve similar questions yourself and compare your approach with the worked example.
Learn what an Operating System is, why it is needed, its objectives, major functions and role in a computer system.
Understand how Operating Systems are classified and how different types are used for different computing environments.
Study the services an Operating System provides to users and application programs.
Learn how application programs request services from the Operating System through system calls.
Understand how an Operating System creates, manages and coordinates processes.
Learn the role of threads in concurrent program execution and the difference between common thread models.
Study how the CPU scheduler selects processes and compare common scheduling algorithms.
Understand how concurrent processes coordinate access to shared data and resources.
Learn why deadlocks occur and how Operating Systems can prevent, avoid, detect and recover from them.
Study how memory is allocated and managed during program execution.
Understand two important memory-management techniques and how logical addresses are mapped to physical memory.
Learn why memory can become inefficiently utilized and how internal and external fragmentation differ.
Understand how virtual memory allows processes to use an address space larger than available physical memory.
Study how the Operating System selects pages for replacement when a page fault occurs.
Learn how files are represented, organized and accessed by an Operating System.
Explore common directory structures used to organize files and folders.
Compare methods used to allocate disk blocks to files and understand their advantages and limitations.
Learn how disk requests are handled and compare common disk scheduling algorithms.
A useful way to study Operating System is to move from basic concepts to resource management and then to algorithms and problem solving.
Start with the basic concepts and services, then study processes, threads and CPU scheduling. After that, move to synchronization, deadlocks, memory management, virtual memory and file systems. For numerical topics, solve examples step by step instead of only reading the formulas.
The tutorials cover commonly taught Operating System concepts. University syllabi can differ, so students should compare these topics with their own current syllabus, prescribed textbook and classroom material.
Diagrams and examples can be used where they make a concept easier to understand. Topics such as process states, memory management, paging, deadlock and disk scheduling benefit particularly from visual explanations and worked examples.
Operating System concepts are relevant to many Computer Science discussions and technical interviews. Understanding processes, threads, scheduling, synchronization, deadlocks and memory management can help students explain how software interacts with system resources.
Basic computer fundamentals are enough to begin most Operating System topics. Programming knowledge can be helpful when studying system calls, process creation and implementation-oriented examples in greater depth.
This Operating System tutorial page currently provides 18 chapter links, covering fundamentals, process management, scheduling, synchronization, deadlocks, memory management, virtual memory, file systems and disk scheduling.