The decidability and complexity of reachability problems and model-checking for flat counter systems have been explored in detail. However, only few results are known for flat FIFO systems, only in some particular cases (a single loop or a single bounded expression). We prove, by establishing reductions between properties, and by reducing SAT to a subset of these properties that many verification problems like reachability, non-termination, unboundedness are NP-complete for flat FIFO systems, generalizing similar existing results for flat counter systems. We construct a trace-flattable counter system that is bisimilar to a given flat FIFO system, which allows to model-check the original flat FIFO system. Our results lay the theoretical foundations and open the way to build a verification tool for (general) FIFO systems based on analysis of flat subsystems.
@InProceedings{finkel_et_al:LIPIcs.CONCUR.2019.12, author = {Finkel, Alain and Praveen, M.}, title = {{Verification of Flat FIFO Systems}}, booktitle = {30th International Conference on Concurrency Theory (CONCUR 2019)}, pages = {12:1--12:17}, series = {Leibniz International Proceedings in Informatics (LIPIcs)}, ISBN = {978-3-95977-121-4}, ISSN = {1868-8969}, year = {2019}, volume = {140}, editor = {Fokkink, Wan and van Glabbeek, Rob}, publisher = {Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik}, address = {Dagstuhl, Germany}, URL = {https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2019.12}, URN = {urn:nbn:de:0030-drops-109147}, doi = {10.4230/LIPIcs.CONCUR.2019.12}, annote = {Keywords: Infinite state systems, FIFO, counters, flat systems, reachability, termination, complexity} }
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