,
Josef Widder
Creative Commons Attribution 3.0 Unported license
Threshold automata, and the counter systems they define, were introduced as a framework for parameterized model checking of fault-tolerant distributed algorithms. This application domain suggested natural constraints on the automata structure, and a specific form of acceleration, called single-rule acceleration: consecutive occurrences of the same automaton rule are executed as a single transition in the counter system. These accelerated systems have bounded diameter, and can be verified in a complete manner with bounded model checking. We go beyond the original domain, and investigate extensions of threshold automata: non-linear guards, increments and decrements of shared variables, increments of shared variables within loops, etc., and show that the bounded diameter property holds for several extensions. Finally, we put single-rule acceleration in the scope of flat counter automata: although increments in loops may break the bounded diameter property, the corresponding counter automaton is flattable, and reachability can be verified using more permissive forms of acceleration.
@InProceedings{kukovec_et_al:LIPIcs.CONCUR.2018.19,
author = {Kukovec, Jure and Konnov, Igor and Widder, Josef},
title = {{Reachability in Parameterized Systems: All Flavors of Threshold Automata}},
booktitle = {29th International Conference on Concurrency Theory (CONCUR 2018)},
pages = {19:1--19:17},
series = {Leibniz International Proceedings in Informatics (LIPIcs)},
ISBN = {978-3-95977-087-3},
ISSN = {1868-8969},
year = {2018},
volume = {118},
editor = {Schewe, Sven and Zhang, Lijun},
publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
address = {Dagstuhl, Germany},
URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2018.19},
URN = {urn:nbn:de:0030-drops-95578},
doi = {10.4230/LIPIcs.CONCUR.2018.19},
annote = {Keywords: threshold \& counter automata, parameterized verification, reachability}
}