Operating Systems
Our Operating Systems course covers processes and threads, CPU scheduling algorithms, process synchronisation, semaphores and monitors, deadlocks, memory management, paging and virtual memory, file systems, disk scheduling and I/O, with examples from Linux. Lessons are live and one-to-one with a verified subject expert, who explains each concept with worked examples, solves problems from your own module and helps you prepare for exams and coursework. Suitable for computer science and engineering students, following university syllabi in the UK, US, Australia and India (including AKTU, VTU and Anna University style courses).
Reviewed by V. Jaiswal, Computer science, AI and software development specialistLast updated
$12 – $32
per hour
Free demo class · pay only if you continue
What you will learn
Learning outcomes
- Understand operating system fundamentals
- Explain processes and threads
- Apply CPU scheduling algorithms
- Understand process synchronization
- Analyze and handle deadlocks
- Explain memory management techniques
- Understand virtual memory
- Explain file system organization
- Understand input and output management
- Apply basic operating system security concepts
Prerequisites
- Basic programming
- Computer fundamentals
- Data structures basics
- Computer architecture basics
Tags
Course structure
Syllabus(9 modules)
- OS functions and characteristics
- Evolution of operating systems
- OS design issues
- System calls
What is Operating Systems?
In short: this course gives one-to-one online tutoring in operating systems for computer science and engineering students. A verified tutor explains processes and threads, CPU scheduling, synchronisation, deadlocks, memory management and file systems, with numerical problems and lab support.
An operating system (OS) is the software that manages a computer's hardware and provides services to programs, such as running processes, sharing the CPU, managing memory and storing files. An operating systems course explains how these services work inside systems like Linux and Windows, and is a core module in computer science and engineering degrees.
This online course teaches Operating Systems one to one with a verified tutor who has studied or taught it at university level, at your pace and aligned with your own module.
Related subject: Operating systems help.
Systems students often pair this course with Compiler Design and System Software.
To go further with concurrency, see our Parallel and Distributed Computing course.
What does the Operating Systems course cover?
| Topic | Key content |
|---|---|
| OS fundamentals | Kernel, system calls, OS structures |
| Process management | Processes, threads, process states, context switching |
| CPU scheduling | FCFS, SJF, priority, round robin, multilevel queues |
| Concurrency and synchronisation | Race conditions, critical sections, mutexes, semaphores, monitors, classic problems |
| Deadlocks | Conditions, prevention, avoidance (Banker's algorithm), detection and recovery |
| Memory management | Contiguous allocation, paging, segmentation, TLBs |
| Virtual memory | Demand paging, page replacement (FIFO, LRU, optimal), thrashing |
| File systems and storage | File allocation, directories, disk scheduling |
| Device management and case studies | I/O systems, Linux and Windows case studies |
How do you solve CPU scheduling problems?
Scheduling questions ask you to compute waiting time and turnaround time for a set of processes.
- Draw a Gantt chart following the algorithm's rules.
- Record each process's completion time.
- Turnaround time = completion time − arrival time.
- Waiting time = turnaround time − burst time.
- Average across processes and compare algorithms.
How do you apply the Banker's algorithm?
- Compute the Need matrix: Need = Max − Allocation.
- Set Work = Available.
- Find a process whose Need ≤ Work.
- Add its Allocation to Work and mark it finished.
- Repeat until all processes finish (safe state) or none can proceed (unsafe).
- Write the safe sequence.
What does a worked CPU scheduling problem look like?
Here is a typical question: three processes arrive at time 0 with burst times P1 = 5, P2 = 3 and P3 = 2. Compare average waiting time under FCFS and SJF.
| Algorithm | Order | Waiting times | Average |
|---|---|---|---|
| FCFS | P1, P2, P3 | 0, 5, 8 | 13 ÷ 3 ≈ 4.33 |
| SJF | P3, P2, P1 | 0, 2, 5 | 7 ÷ 3 ≈ 2.33 |
SJF gives the lower average waiting time when all processes arrive together.
Where do students lose marks in Operating Systems?
Students most often lose marks with Gantt charts that don't match the algorithm, confusing waiting and turnaround time, misapplying the Banker's algorithm, and vague explanations of synchronisation.
| Mark-loser | What to do instead |
|---|---|
| Gantt chart errors | Draw it step by step with arrival times |
| Waiting vs turnaround confused | Turnaround = completion − arrival; waiting = turnaround − burst |
| Banker's algorithm errors | Recompute Need = Max − Allocation carefully |
| Vague synchronisation answers | Name the race condition and the fix |
| Page faults miscounted | Trace frames for each reference |
How is it assessed, and how can a tutor help?
Operating systems modules are usually assessed by written exams with numericals on scheduling, page replacement and deadlock, plus lab assignments in C on processes, threads and synchronisation.
Tutors explain concepts, work through practice problems with you and give feedback on your approach. Graded work you submit must be your own, as set out in our academic integrity policy. For deadline-driven guidance, see assignment help.
How the lessons work
Lessons are live and one to one on video with screen sharing and a shared whiteboard. You can follow a full course or book sessions on the topics you find hardest before exams. See also System Software, Computer Architecture and Microprocessors and Computer Networks.
Operating systems tutor online: who this course is for, prerequisites and study plan
An operating systems tutor online gives you live 1-to-1 lessons on processes, CPU scheduling, synchronisation, deadlocks and memory management, working through numericals step by step.
This course suits computer science and IT students preparing for university exams and placement interviews.
Prerequisites: basic programming, computer fundamentals, and basic data structures and computer architecture.
Course length: 40 one-hour lessons across 9 modules.
| Stage | Topics | What you can do afterwards |
|---|---|---|
| 1 | Fundamental concepts; process management | Explain processes, threads and system calls |
| 2 | CPU scheduling; deadlocks; concurrent processes | Solve scheduling and deadlock problems and explain synchronisation |
| 3 | Memory management; file systems | Solve paging problems and explain file storage |
| 4 | Device management; case studies | Compare how real operating systems work |
Where it leads: see the Computer Networks course or the Data Structures and Algorithms course.
Operating Systems: frequently asked questions
What is an operating system?
Software that manages hardware and provides services such as processes, memory and files to programs.
What is the difference between a process and a thread?
A process has its own memory space; threads share their process's memory and resources.
What is a deadlock?
A state where processes wait for each other's resources forever.
What is virtual memory?
A technique that lets programs use more memory than is physically available, using disk storage and paging.
Which page replacement algorithm is best?
Optimal is best in theory; LRU is a good practical approximation.
What is a semaphore?
A synchronisation variable used to control access to shared resources.
Can you help with OS lab programs in C?
Yes. Tutors explain system calls, threads and synchronisation code.
Can you help me prepare for my OS exam?
Yes. Tutors practise scheduling, paging and deadlock numericals.
How much does a Operating Systems tutor cost?
The price depends on the tutor and session length. You see the hourly rate before booking, with no subscription.
Can a tutor do my assignment for me?
No. Tutors explain, guide and give feedback so you can complete your own work, in line with our academic integrity policy.
How do I calculate waiting time?
Waiting time = turnaround time − burst time, where turnaround = completion − arrival.
Why does SJF reduce waiting time?
Running shorter jobs first reduces the time other jobs wait, minimising the average when bursts are known.
What is round robin scheduling?
Each process runs for a fixed time quantum in turn, which improves response time.
What are the four conditions for deadlock?
Mutual exclusion, hold and wait, no preemption and circular wait.
What is thrashing?
When a system spends more time paging than executing because processes lack enough frames.
What is a race condition?
When the result depends on the timing of concurrent accesses to shared data.
How does LRU page replacement work?
It replaces the page that has not been used for the longest time.
What is the difference between paging and segmentation?
Paging uses fixed-size blocks; segmentation uses variable-size logical units.
What are the important topics in operating systems?
The most examined operating systems topics are processes and threads, CPU scheduling algorithms, process synchronisation with semaphores, deadlocks and the banker's algorithm, memory management with paging and segmentation, virtual memory and page replacement, and file systems. Your tutor practises numerical scheduling and page-replacement questions, which appear in most exams.
Do you offer lessons in my time zone?
Yes. Lessons are online, so you can book times that suit your time zone.
Can I get an operating systems tutor online?
Yes. You can learn with a 1-to-1 operating systems tutor online through live lessons with a shared whiteboard. Your tutor works through scheduling, deadlock and paging numericals step by step, explains synchronisation clearly and practises past-paper questions before your exam.
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