Prof. Sema: Operating Systems
Learn Concurrency Visually
Free · Designed for iPad. Not verified for macOS.
Studying operating systems? Control thread steps, watch race conditions happen, and learn locks, semaphores, and deadlocks by seeing every state change.
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.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
The developer, Chenxi Yang, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Contact Info
- Identifiers
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Chenxi Yang
- Size
- 11.2 MB
- Category
- Education
- Compatibility
Requires iOS 15.0 or later.
- iPhone
Requires iOS 15.0 or later. - iPad
Requires iPadOS 15.0 or later. - iPod touch
Requires iOS 15.0 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
4+
- 4+
- Copyright
- © 2026 Einar Yang