# Prof. Sema: Operating Systems

> Prof. Sema: Operating Systems (iPhone/iPad app by Chenxi Yang.)

- Source: https://appshunter.io/ios/app/prof-sema-operating-systems/id6787905862 (this page in markdown: same URL + `.md`)
- Developer: [Chenxi Yang](https://appshunter.io/developer/1893758426)
- Category: Education
- Price: Free
- Age rating: 4+
- Requires: iOS 15.0 · 11 MB
- Languages: English
- Released: 2026-07-29
- Data updated: 2026-07-30
- User reviews in markdown: https://appshunter.io/ios/app/prof-sema-operating-systems/id6787905862/reviews.md

## What is Prof. Sema?

Stop memorizing concurrency diagrams. See them run.

Prof. Sema is an interactive operating systems study tool for computer science students. You choose each thread's next operation, then watch shared memory, locks, queues, and blocked threads update live.

MAKE THE BUG HAPPEN
Try a common mistake on purpose. Create a race condition, block a thread, or build a deadlock. Prof. Sema shows exactly what changed and why. Undo the step and try a safer ordering.

PRACTICE 7 CORE CONCEPTS
• Race conditions and thread interleavings
• Mutexes and critical sections
• Semaphores using wait()/signal() and P()/V()
• Producer-consumer bounded buffers
• Readers-writers synchronization
• Dining philosophers
• AB-BA transfer deadlocks

HOW IT WORKS
• Pick real thread operations one step at a time
• See shared state and synchronization update live
• Try realistic mistakes and observe their consequences
• Undo and reset freely
• Open a concise explanation for each concept

Use Prof. Sema for an operating systems course, exam revision, interview prep, or self-study. Every lesson works without an account. Sign in only if you want to sync progress across devices.

Free. No ads. No tracking.


## Version history (last 1 release)

### 1.0 — 2026-07-29

No release notes.

## More apps by Chenxi Yang

- [Gemholic: AI Companion Chat](https://appshunter.io/ios/app/gemholic-ai-companion-chat/id6762309929)

All apps by Chenxi Yang: https://appshunter.io/developer/1893758426

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-07-30.*