Abstract
This paper develops a Multiset Rewriting language with explicit time for the specification and analysis of Time-Sensitive Distributed Systems (TSDS). Goals are often specified using explicit time constraints. A good trace is an infinite trace in which the goals are satisfied perpetually despite possible interference from the environment. In our previous work [14], we discussed two desirable properties of TSDSes, realizability (there exists a good trace) and survivability (where, in addition, all admissible traces are good). Here we consider two additional properties, recoverability (all compliant traces do not reach points-of-no-return) and reliability (the system can always continue functioning using a good trace). Following [14], we focus on a class of systems called Progressing Timed Systems (PTS), where intuitively only a finite number of actions can be carried out in a bounded time period. We prove that for this class of systems the properties of recoverability and reliability coincide and are PSPACE-complete. Moreover, if we impose a bound on time (as in bounded model-checking), we show that for PTS the reliability property is in the \(\varPi _2^p\) class of the polynomial hierarchy, a subclass of PSPACE. We also show that the bounded survivability is both NP-hard and coNP-hard.
Dedicated to Joshua Guttman with gratitude for his inspiration and friendly and insightful discussions.
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Notes
- 1.
For simplicity, in the rest of the paper, for properties of systems and configurations, we will not always explicitly state the critical configuration specification, initial configuration, and/or time samplingwith respect to which the property is considered. For example, when it is clear from the context, we simply say that a system satisfies \(Z\) property or that it is realizable.
Also, when for a property of an MSR \(\mathcal {T}\) we only consider traces that use the l.t.s., we also say that \(\mathcal {T}\) uses the lazy time sampling.
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Acknowledgments
We thank the anonymous reviewers for their valuable comments and careful remarks, which have significantly improved the presentation of the paper. Ban Kirigin is supported in part by the Croatian Science Foundation under the project UIP-05-2017-9219. The work of Max Kanovich was partially supported by EPSRC Programme Grant EP/R006865/1: “Interface Reasoning for Interacting Systems (IRIS).” Nigam is partially supported by NRL grant N0017317-1-G002, and CNPq grant 303909/2018-8. Scedrov was partially supported by the U. S. Office of Naval Research under award numbers N00014-20-1-2635 and N00014-18-1-2618. Talcott was partially supported by the U. S. Office of Naval Research under award numbers N00014-15-1-2202 and N00014-20-1-2644, and NRL grant N0017317-1-G002.
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Kanovich, M., Kirigin, T.B., Nigam, V., Scedrov, A., Talcott, C. (2021). On the Complexity of Verification of Time-Sensitive Distributed Systems. In: Dougherty, D., Meseguer, J., Mödersheim, S.A., Rowe, P. (eds) Protocols, Strands, and Logic. Lecture Notes in Computer Science(), vol 13066. Springer, Cham. https://doi.org/10.1007/978-3-030-91631-2_14
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