Fischer's protocol revisited: a simple proof using modal constraints
Proceedings of the DIMACS/SYCON workshop on Hybrid systems III : verification and control: verification and control
Model checking
Software engineering (6th ed.)
Software engineering (6th ed.)
Efficient and User-Friendly Verification
IEEE Transactions on Computers
Scheduler Modeling Based on the Controller Synthesis Paradigm
Real-Time Systems
Specification and verification of concurrent systems in CESAR
Proceedings of the 5th Colloquium on International Symposium on Programming
Risk Ordering of States in Safecharts
SAFECOMP '00 Proceedings of the 19th International Conference on Computer Safety, Reliability and Security
Design and Synthesis of Synchronization Skeletons Using Branching-Time Temporal Logic
Logic of Programs, Workshop
A State Graph Manipulator Tool for Real-Time System Specification and Verification
RTCSA '98 Proceedings of the 5th International Conference on Real-Time Computing Systems and Applications
Safecharts for Specifying and Designing Safety Critical Systems
SRDS '99 Proceedings of the 18th IEEE Symposium on Reliable Distributed Systems
Risk Bands - A Novel Feature of Safecharts
ISSRE '00 Proceedings of the 11th International Symposium on Software Reliability Engineering
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With rapid development in science and technology, we now see the ubiquitous use of different types of safety-critical systems in our daily lives such as in avionics, consumer electronics, and medical systems. In such systems, unintentional design faults might result in injury or even death to human beings. To make sure that safety-critical systems are really safe, there is need to verify them formally. However, the verification of such systems is getting more and more difficult, because the designs are becoming very complex. To cope with high design complexity, currently model-driven architecture design is becoming a well-accepted trend. However, conventional methods of code testing and standards conformance do not fit very well with such model-based approaches. To bridge this gap, we propose a model-based formal verification technique for safety-critical systems. In this work, the model checking paradigm is applied to the Safecharts model which was used for modeling, but not yet used for verification. Our contributions are five folds. Firstly, the safety constraints in Safecharts are mapped to semantic equivalents in timed automata for verification. Secondly, the theory for safety constraint verification is proved and implemented in a compositional model checker (SGM). Thirdly, prioritized transitions are implemented in SGM to model the risk semantics in Safecharts. Fourthly, it is shown how the original Safecharts lacked synchronization semantics which could lead to safety hazards. A solution to this issue is also proposed. Finally, it is shown that priority-based approach to mutual exclusion of resource usage in the original Safecharts is unsafe and corresponding solutions are proposed here. Application examples show the feasibility and benefits of the proposed model-driven verification of safety-critical systems.