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Operating Systems

Real-Time Systems

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Due to the forthcoming retirement of Prof. Härtig, availability of exam appointments will be limited after the summer exam period.


Real-time systems are systems interacting with the real world. Their correctness depends on the timeliness of results. This topic touches many of the classical branches of computer science. It is related to computer architecture like bus design, operating systems, programming languages, software engineering, use cases like multimedia or car electronics, and theoretical computer science. Processor scheduling, a synonym for real-time systems in many universities, is but a true subset of what we try to teach in this course.

The lecture is very loosely based on these two books:
  • Jane Liu: Real-Time Systems
  • Hermann Kopetz: Real-Time Systems
Despite bearing the same title, the books a fundamentally different. The authors even follow different schools of real-time systems. Neither book covers all areas of real time systems. Consequently, we use both books in the lecture and also mix in publications and own experiences. And we are generous with leaving things out.

The lecture will be a bit heterogeneous, as we are trying to cover a broad range of topics. However, we cut short on scheduling theory and the deeper mathematics, as this is covered in the lecture on scheduling theory.


  1. Introduction
  2. Modeling Real-Time Systems
  3. Time and Order
  4. Time-Driven Systems
  5. Event-Driven Scheduling
  6. Real-Time Communication
  7. Hardware
  8. Real-Time Operating Systems
  9. Resource Access Protocols
  10. Multiprocessor Scheduling
  11. Probabilistic Scheduling
  12. Mixed-criticality Systems


  1. Terms and Concepts on 29th Oct, 4.40 PM (after the lecture)
  2. Time and Order on 12th Nov, 4.40 PM (after the lecture)
  3. Scheduling on 26th Nov, 2.50 PM (replacing the lecture)
  4. Hardware on 17th Dec, 4.40 PM (after the lecture)
Last modified: 2nd Apr 2020, 1.32 PM
Author: Webmaster

Prof. Dr.
Hermann Härtig

Phone: +49 (0) 351 463-38282
Fax: +49 (0) 351 463-38284
e-mail contact form

  • ModuleModules: INF-BAS4, INF-VERT4, DSE-E9, INF-LE-EUI
  • Credits6 Credit Points
  • 2/1/0 = 3 SWS
Time and Place

This course is not being offered in this term.