scholarly journals Modeling and Verification of ARINC 653 Hierarchical Preemptive Scheduling

2019 ◽  
Vol 17 (1) ◽  
pp. 99-106 ◽  
Author(s):  
Ning Fu ◽  
Lijun Shan ◽  
Chenglie Du ◽  
Zhiqiang Liu ◽  
Han Peng
Keyword(s):  
Model Checking ◽  
Timed Automata ◽  
Automata Theory ◽  
Traditional Scheduling ◽  
Preemptive Scheduling ◽  
Scheduling System ◽  
Software Interface ◽  
Precise Analysis ◽  
Stop Watch ◽  
Automata Network

Avionics Application Standard Software Interface (ARINC 653) is a software specification for space and time partitioning in safety-critical avionics real-time operating systems. Correctly designed task schedulers are crucial for ARINC 653 running systems. This paper proposes a model-checking-based method for analyzing and verifying ARINC 653 scheduling model. Based on priced timed automata theory, an ARINC 653 scheduling system was modeled as a priced timed automata network. The schedulability of the system was described as a set of temporal logic expressions, and was analyzed and verified by a model checker. Our research shows that it is feasible to use model checking to analyze task schedulability in an ARINC 653 hierarchical scheduling system. The method discussed modeled preemptive scheduling by using the stop/watch features of priced timed automata. Unlike traditional scheduling analysis techniques, the proposed approach uses an exhaustive method to automate analysis of the schedulability of a system, resulting in a more precise analysis

Automata theory and higher-order model-checking

2016 ◽  
Vol 3 (4) ◽  
pp. 13-31 ◽  
Author(s):  
Igor Walukiewicz
Keyword(s):  
Model Checking ◽  
Higher Order ◽  
Automata Theory ◽  
Order Model

Schedulability Analysis for Timed Automata With Tasks

2021 ◽  
Vol 20 (5s) ◽  
pp. 1-26
Author(s):  
Jinghao Sun ◽  
Nan Guan ◽  
Rongxiao Shi ◽  
Guozhen Tan ◽  
Wang Yi
Keyword(s):  
Model Checking ◽  
State Space ◽  
Real Time ◽  
Timed Automata ◽  
Schedulability Analysis ◽  
Scheduling Theory ◽  
Real Time Scheduling ◽  
Analysis Techniques ◽  
Model Complex ◽  
Time Scheduling

Research on modeling and analysis of real-time computing systems has been done in two areas, model checking and real-time scheduling theory. In model checking, an expressive modeling formalism such as timed automata (TA) is used to model complex systems, but the analysis is typically very expensive due to state-space explosion. In real-time scheduling theory, the analysis techniques are highly efficient, but the models are often restrictive. In this paper, we aim to exploit the possibility of applying efficient analysis techniques rooted in real-time scheduling theory to analysis of real-time task systems modeled by timed automata with tasks (TAT). More specifically, we develop efficient techniques to analyze the feasibility of TAT-based task models (i.e., whether all tasks can meet their deadlines on single-processor) using demand bound functions (DBF), a widely used workload abstraction in real-time scheduling theory. Our proposed analysis method has a pseudo-polynomial time complexity if the number of clocks used to model each task is bounded by a constant, which is much lower than the exponential complexity of the traditional model-checking based analysis approach (also assuming the number of clocks is bounded by a constant). We apply dynamic programming techniques to implement the DBF-based analysis framework, and propose state space pruning techniques to accelerate the analysis process. Experimental results show that our DBF-based method can analyze a TAT system with 50 tasks within a few minutes, which significantly outperforms the state-of-the-art TAT-based schedulability analysis tool TIMES.

Proving properties of autonomous car manoeuvres in urban traffic

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Maike Schwammberger
Keyword(s):  
Model Checking ◽  
Functional Properties ◽  
Timed Automata ◽  
Urban Traffic ◽  
Abstract Model ◽  
Automated Driving ◽  
Spatial Logic

Abstract As automated driving techniques are increasingly capturing the market, it is particularly important to consider vital functional properties of these systems. We present an overview of an approach that uses an abstract model to logically reason about properties of autonomous manoeuvres at intersections in urban traffic. The approach introduces automotive-controlling timed automata crossing controllers that use the traffic logic UMLSL (Urban Multi-lane Spatial Logic) to reason about traffic situations. Safety in the context of collision freedom is mathematically proven. Liveness (something good finally happens) and fairness (no queue-jumping) are examined and verified using a model-checking tool for timed automata, UPPAAL.

scholarly journals Model Checking via Reachability Testing for Timed Automata

1997 ◽  
Vol 4 (29) ◽  
Author(s):  
Luca Aceto ◽  
Augusto Burgueno ◽  
Kim G. Larsen
Keyword(s):  
Model Checking ◽  
Timed Automata ◽  
Reachability Problem ◽  
Liveness Properties ◽  
Time Logic ◽  
Definition Of ◽  
Reachability Testing ◽  
Time Systems ◽  
Timed Automaton ◽  
Theoretical Side

In this paper we develop an approach to model-checking for timed automata via reachability testing. As our specification formalism, we consider a dense-time logic with clocks. This logic may be used to express safety and bounded liveness properties of real-time systems. We show how to automatically synthesize, for every logical formula phi, a so-called test automaton T_phi in such a way that checking whether a system S satisfies the property phi can be reduced to a reachability question over the system obtained by making T_phi interact with S. <br />The testable logic we consider is both of practical and theoretical interest. On the practical side, we have used the logic, and the associated approach to model-checking via reachability testing it supports, in the specification and verification in Uppaal of a collision avoidance protocol. On the theoretical side, we show that the logic is powerful enough to permit the definition of characteristic properties, with respect to a timed version of<br />the ready simulation preorder, for nodes of deterministic, tau-free timed automata. This allows one to compute behavioural relations via our model-checking technique, therefore effectively reducing the problem of checking the existence of a behavioural relation among states of a timed automaton to a reachability problem.

scholarly journals Online On-the-Fly Testing of Real-time Systems

2003 ◽  
Vol 10 (49) ◽  
Author(s):  
Marius Mikucionis ◽  
Kim G. Larsen ◽  
Brian Nielsen
Keyword(s):  
Real Time ◽  
Test Generation ◽  
Timed Automata ◽  
Online Testing ◽  
Real Time Systems ◽  
Model Checker ◽  
Test Specification ◽  
And Performance ◽  
Automata Network ◽  
Time Systems

In this paper we present a framework, an algorithm and a new tool for online testing of real-time systems based on symbolic techniques used in UPPAAL model checker. We extend UPPAAL timed automata network model to a test specification which is used to generate test primitives and to check the correctness of system responses including the timing aspects. We use timed trace inclusion as a conformance relation between system and specification to draw a test verdict. The test generation and execution algorithm is implemented as an extension to UPPAAL and experiments carried out to examine the correctness and performance of the tool. The experiment results are promising.

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