DROPS

Volume

LIPIcs, Volume 279

34th International Conference on Concurrency Theory (CONCUR 2023)

CONCUR 2023, September 18-23, 2023, Antwerp, Belgium

Editors: Guillermo A. Pérez and Jean-François Raskin

Volume

LIPIcs, Volume 83

42nd International Symposium on Mathematical Foundations of Computer Science (MFCS 2017)

MFCS 2017, August 21-25, 2017, Aalborg, Denmark

Editors: Kim G. Larsen, Hans L. Bodlaender, and Jean-Francois Raskin

Document

Complete Volume

DOI: 10.4230/LIPIcs.CONCUR.2023

LIPIcs, Volume 279, CONCUR 2023, Complete Volume

Authors: Guillermo A. Pérez and Jean-François Raskin

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

LIPIcs, Volume 279, CONCUR 2023, Complete Volume

Cite as

34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 1-666, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@Proceedings{perez_et_al:LIPIcs.CONCUR.2023,
  title =	{{LIPIcs, Volume 279, CONCUR 2023, Complete Volume}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{1--666},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023},
  URN =		{urn:nbn:de:0030-drops-189936},
  doi =		{10.4230/LIPIcs.CONCUR.2023},
  annote =	{Keywords: LIPIcs, Volume 279, CONCUR 2023, Complete Volume}
}

Document

Front Matter

DOI: 10.4230/LIPIcs.CONCUR.2023.0

Front Matter, Table of Contents, Preface, Conference Organization

Authors: Guillermo A. Pérez and Jean-François Raskin

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

Front Matter, Table of Contents, Preface, Conference Organization

Cite as

34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 0:i-0:x, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{perez_et_al:LIPIcs.CONCUR.2023.0,
  author =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  title =	{{Front Matter, Table of Contents, Preface, Conference Organization}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{0:i--0:x},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.0},
  URN =		{urn:nbn:de:0030-drops-189942},
  doi =		{10.4230/LIPIcs.CONCUR.2023.0},
  annote =	{Keywords: Front Matter, Table of Contents, Preface, Conference Organization}
}

Document

Invited Paper

DOI: 10.4230/LIPIcs.CONCUR.2023.1

CONCUR Test-Of-Time Award 2023 (Invited Paper)

Authors: Bengt Jonsson, Marta Kwiatkowska, and Igor Walukiewicz

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

This short article recaps the purpose of the CONCUR Test-of-Time Award and presents the paper that received the Award in 2023.

Cite as

Bengt Jonsson, Marta Kwiatkowska, and Igor Walukiewicz. CONCUR Test-Of-Time Award 2023 (Invited Paper). In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 1:1-1:2, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{jonsson_et_al:LIPIcs.CONCUR.2023.1,
  author =	{Jonsson, Bengt and Kwiatkowska, Marta and Walukiewicz, Igor},
  title =	{{CONCUR Test-Of-Time Award 2023}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{1:1--1:2},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.1},
  URN =		{urn:nbn:de:0030-drops-189953},
  doi =		{10.4230/LIPIcs.CONCUR.2023.1},
  annote =	{Keywords: CONCUR Test-of-Time Award}
}

Document

Invited Talk

DOI: 10.4230/LIPIcs.CONCUR.2023.2

On Verifying Concurrent Programs Under Weakly Consistent Models (Invited Talk)

Authors: Ahmed Bouajjani

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

Developing correct and performant concurrent systems is a major challenge. When programming an application using a memory system, a natural expectation would be that each memory update is immediately visible to all concurrent threads (which corresponds to strong consistency). However, for performance reasons, only weaker guarantees can be ensured by memory systems, defined by what sets of updates can be made visible to each thread at any moment, and by the order in which they are made visible. The conditions on the visibility order guaranteed by a memory system corresponds to its memory consistency model. Weak consistency models admit complex and unintuitive behaviors, which makes the task of application programmers extremely hard. It is therefore important to determine an adequate level of consistency for each given application: a level that is weak enough to ensure performance, but also strong enough to ensure correctness of the application behaviors. This leads to the consideration of several important verification problems: - the correctness of an application program running over a weak consistency model; - the robustness of an application program w.r.t. consistency weakening; - the fact that an implementation of a system (memory, storage system) guarantees a given (weak) consistency model. The talk gives a broad presentation of these issues and some results in this research area. The talk is based on several joint works with students and colleagues during the last few years.

Cite as

Ahmed Bouajjani. On Verifying Concurrent Programs Under Weakly Consistent Models (Invited Talk). In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, p. 2:1, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{bouajjani:LIPIcs.CONCUR.2023.2,
  author =	{Bouajjani, Ahmed},
  title =	{{On Verifying Concurrent Programs Under Weakly Consistent Models}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{2:1--2:1},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.2},
  URN =		{urn:nbn:de:0030-drops-189961},
  doi =		{10.4230/LIPIcs.CONCUR.2023.2},
  annote =	{Keywords: Concurrent programs, weakly consistent models}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.3

Reachability and Bounded Emptiness Problems of Constraint Automata with Prefix, Suffix and Infix

Authors: Jakub Michaliszyn, Jan Otop, and Piotr Wieczorek

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

We study constraint automata, which are finite-state automata over infinite alphabets consisting of tuples of words. A constraint automaton can compare the words of the consecutive tuples using Boolean combinations of the relations prefix, suffix, infix and equality. First, we show that the reachability problem of such automata is PSpace-complete. Second, we study automata over infinite sequences with Büchi conditions. We show that the problem: given a constraint automaton, is there a bound B and a sequence of tuples of words of length bounded by B, which is accepted by the automaton, is also PSpace-complete. These results contribute towards solving the long-standing open problem of the decidability of the emptiness problem for constraint automata, in which the words can have arbitrary lengths.

Cite as

Jakub Michaliszyn, Jan Otop, and Piotr Wieczorek. Reachability and Bounded Emptiness Problems of Constraint Automata with Prefix, Suffix and Infix. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 3:1-3:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{michaliszyn_et_al:LIPIcs.CONCUR.2023.3,
  author =	{Michaliszyn, Jakub and Otop, Jan and Wieczorek, Piotr},
  title =	{{Reachability and Bounded Emptiness Problems of Constraint Automata with Prefix, Suffix and Infix}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{3:1--3:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.3},
  URN =		{urn:nbn:de:0030-drops-189971},
  doi =		{10.4230/LIPIcs.CONCUR.2023.3},
  annote =	{Keywords: constraint automata, emptiness problem}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.4

The Best of Both Worlds: Model-Driven Engineering Meets Model-Based Testing

Authors: P. H. M. van Spaendonck and Tim A. C. Willemse

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

We study the connection between stable-failures refinement and the ioco conformance relation. Both behavioural relations underlie methodologies that have gained traction in industry: stable-failures refinement is used in several commercial Model-Driven Engineering tool suites, whereas the ioco conformance relation is used in Model-Based Testing tools. Refinement-based Model-Driven Engineering approaches promise to generate executable code from high-level models, thus guaranteeing that the code upholds specified behavioural contracts. Manual testing, however, is still required to gain confidence that the model-to-code transformation and the execution platform do not lead to unexpected contract violations. We identify conditions under which also this last step in the design methodology can be automated using the ioco conformance relation and the associated tools.

Cite as

P. H. M. van Spaendonck and Tim A. C. Willemse. The Best of Both Worlds: Model-Driven Engineering Meets Model-Based Testing. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 4:1-4:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{vanspaendonck_et_al:LIPIcs.CONCUR.2023.4,
  author =	{van Spaendonck, P. H. M. and Willemse, Tim A. C.},
  title =	{{The Best of Both Worlds: Model-Driven Engineering Meets Model-Based Testing}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{4:1--4:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.4},
  URN =		{urn:nbn:de:0030-drops-189988},
  doi =		{10.4230/LIPIcs.CONCUR.2023.4},
  annote =	{Keywords: stable-failures refinement, Model-Driven Engineering, input output conformance, Input Output Labelled Transition Systems, internal choice}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.5

Process-Algebraic Models of Multi-Writer Multi-Reader Non-Atomic Registers

Authors: Myrthe S. C. Spronck and Bas Luttik

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

We present process-algebraic models of multi-writer multi-reader safe, regular and atomic registers. We establish the relationship between our models and alternative versions presented in the literature. We use our models to formally analyse by model checking to what extent several well-known mutual exclusion algorithms are robust for relaxed atomicity requirements. Our analyses refute correctness claims made about some of these algorithms in the literature.

Cite as

Myrthe S. C. Spronck and Bas Luttik. Process-Algebraic Models of Multi-Writer Multi-Reader Non-Atomic Registers. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 5:1-5:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{spronck_et_al:LIPIcs.CONCUR.2023.5,
  author =	{Spronck, Myrthe S. C. and Luttik, Bas},
  title =	{{Process-Algebraic Models of Multi-Writer Multi-Reader Non-Atomic Registers}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{5:1--5:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.5},
  URN =		{urn:nbn:de:0030-drops-189995},
  doi =		{10.4230/LIPIcs.CONCUR.2023.5},
  annote =	{Keywords: mutual exclusion, model checking, non-atomic reads and writes, regular register}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.6

Geometry of Reachability Sets of Vector Addition Systems

Authors: Roland Guttenberg, Mikhail Raskin, and Javier Esparza

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

Vector Addition Systems (VAS), aka Petri nets, are a popular model of concurrency. The reachability set of a VAS is the set of configurations reachable from the initial configuration. Leroux has studied the geometric properties of VAS reachability sets, and used them to derive decision procedures for important analysis problems. In this paper we continue the geometric study of reachability sets. We show that every reachability set admits a finite decomposition into disjoint almost hybridlinear sets enjoying nice geometric properties. Further, we prove that the decomposition of the reachability set of a given VAS is effectively computable. As a corollary, we derive a new proof of Hauschildt’s 1990 result showing the decidability of the question whether the reachability set of a given VAS is semilinear. As a second corollary, we prove that the complement of a reachability set, if it is infinite, always contains an infinite linear set.

Cite as

Roland Guttenberg, Mikhail Raskin, and Javier Esparza. Geometry of Reachability Sets of Vector Addition Systems. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 6:1-6:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{guttenberg_et_al:LIPIcs.CONCUR.2023.6,
  author =	{Guttenberg, Roland and Raskin, Mikhail and Esparza, Javier},
  title =	{{Geometry of Reachability Sets of Vector Addition Systems}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{6:1--6:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.6},
  URN =		{urn:nbn:de:0030-drops-190005},
  doi =		{10.4230/LIPIcs.CONCUR.2023.6},
  annote =	{Keywords: Vector Addition System, Petri net, Reachability Set, Almost hybridlinear, Partition, Geometry}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.7

Safety Analysis of Parameterised Networks with Non-Blocking Rendez-Vous

Authors: Lucie Guillou, Arnaud Sangnier, and Nathalie Sznajder

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

We consider networks of processes that all execute the same finite-state protocol and communicate via a rendez-vous mechanism. When a process requests a rendez-vous, another process can respond to it and they both change their control states accordingly. We focus here on a specific semantics, called non-blocking, where the process requesting a rendez-vous can change its state even if no process can respond to it. In this context, we study the parameterised coverability problem of a configuration, which consists in determining whether there is an initial number of processes and an execution allowing to reach a configuration bigger than a given one. We show that this problem is EXPSPACE-complete and can be solved in polynomial time if the protocol is partitioned into two sets of states, the states from which a process can request a rendez-vous and the ones from which it can answer one. We also prove that the problem of the existence of an execution bringing all the processes in a final state is undecidable in our context. These two problems can be solved in polynomial time with the classical rendez-vous semantics.

Cite as

Lucie Guillou, Arnaud Sangnier, and Nathalie Sznajder. Safety Analysis of Parameterised Networks with Non-Blocking Rendez-Vous. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 7:1-7:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{guillou_et_al:LIPIcs.CONCUR.2023.7,
  author =	{Guillou, Lucie and Sangnier, Arnaud and Sznajder, Nathalie},
  title =	{{Safety Analysis of Parameterised Networks with Non-Blocking Rendez-Vous}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{7:1--7:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.7},
  URN =		{urn:nbn:de:0030-drops-190015},
  doi =		{10.4230/LIPIcs.CONCUR.2023.7},
  annote =	{Keywords: Parameterised verification, Coverability, Counter machines}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.8

Separability and Non-Determinizability of WSTS

Authors: Eren Keskin and Roland Meyer

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

There is a recent separability result for the languages of well-structured transition systems (WSTS) that is surprisingly general: disjoint WSTS languages are always separated by a regular language. The result assumes that one of the languages is accepted by a deterministic WSTS, and it is not known whether this assumption is needed. There are two ways to get rid of the assumption, none of which has led to conclusions so far: (i) show that WSTS can be determinized or (ii) generalize the separability result to non-deterministic WSTS languages. Our contribution is to show that (i) does not work but (ii) does. As for (i), we give a non-deterministic WSTS language that we prove cannot be accepted by a deterministic WSTS. The proof relies on a novel characterization of the languages accepted by deterministic WSTS. As for (ii), we show how to find finitely represented inductive invariants without having the tool of ideal decompositions at hand. Instead, we work with closures under converging sequences. Our results hold for upward- and downward-compatible WSTS.

Cite as

Eren Keskin and Roland Meyer. Separability and Non-Determinizability of WSTS. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 8:1-8:17, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{keskin_et_al:LIPIcs.CONCUR.2023.8,
  author =	{Keskin, Eren and Meyer, Roland},
  title =	{{Separability and Non-Determinizability of WSTS}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{8:1--8:17},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.8},
  URN =		{urn:nbn:de:0030-drops-190025},
  doi =		{10.4230/LIPIcs.CONCUR.2023.8},
  annote =	{Keywords: WSTS, regular separability, determinization}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.9

Compositional Correctness and Completeness for Symbolic Partial Order Reduction

Authors: Åsmund Aqissiaq Arild Kløvstad, Eduard Kamburjan, and Einar Broch Johnsen

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

Partial Order Reduction (POR) and Symbolic Execution (SE) are two fundamental abstraction techniques in program analysis. SE is particularly useful as a state abstraction technique for sequential programs, while POR addresses equivalent interleavings in the execution of concurrent programs. Recently, several promising connections between these two approaches have been investigated, which result in symbolic partial order reduction: partial order reduction of symbolically executed programs. In this work, we provide compositional notions of completeness and correctness for symbolic partial order reduction. We formalize completeness and correctness for (1) abstraction over program states and (2) trace equivalence, such that the abstraction gives rise to a complete and correct SE, the trace equivalence gives rise to a complete and correct POR, and their combination results in complete and correct symbolic partial order reduction. We develop our results for a core parallel imperative programming language and mechanize the proofs in Coq.

Cite as

Åsmund Aqissiaq Arild Kløvstad, Eduard Kamburjan, and Einar Broch Johnsen. Compositional Correctness and Completeness for Symbolic Partial Order Reduction. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 9:1-9:16, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

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@InProceedings{klvstad_et_al:LIPIcs.CONCUR.2023.9,
  author =	{Kl{\o}vstad, \r{A}smund Aqissiaq Arild and Kamburjan, Eduard and Johnsen, Einar Broch},
  title =	{{Compositional Correctness and Completeness for Symbolic Partial Order Reduction}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{9:1--9:16},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.9},
  URN =		{urn:nbn:de:0030-drops-190035},
  doi =		{10.4230/LIPIcs.CONCUR.2023.9},
  annote =	{Keywords: Symbolic Execution, Coq, Trace Semantics, Partial Order Reduction}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.10

Monus Semantics in Vector Addition Systems with States

Authors: Pascal Baumann, Khushraj Madnani, Filip Mazowiecki, and Georg Zetzsche

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

Vector addition systems with states (VASS) are a popular model for concurrent systems. However, many decision problems have prohibitively high complexity. Therefore, it is sometimes useful to consider overapproximating semantics in which these problems can be decided more efficiently. We study an overapproximation, called monus semantics, that slightly relaxes the semantics of decrements: A key property of a vector addition systems is that in order to decrement a counter, this counter must have a positive value. In contrast, our semantics allows decrements of zero-valued counters: If such a transition is executed, the counter just remains zero. It turns out that if only a subset of transitions is used with monus semantics (and the others with classical semantics), then reachability is undecidable. However, we show that if monus semantics is used throughout, reachability remains decidable. In particular, we show that reachability for VASS with monus semantics is as hard as that of classical VASS (i.e. Ackermann-hard), while the zero-reachability and coverability are easier (i.e. EXPSPACE-complete and NP-complete, respectively). We provide a comprehensive account of the complexity of the general reachability problem, reachability of zero configurations, and coverability under monus semantics. We study these problems in general VASS, two-dimensional VASS, and one-dimensional VASS, with unary and binary counter updates.

Cite as

Pascal Baumann, Khushraj Madnani, Filip Mazowiecki, and Georg Zetzsche. Monus Semantics in Vector Addition Systems with States. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 10:1-10:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

Copy BibTex To Clipboard

@InProceedings{baumann_et_al:LIPIcs.CONCUR.2023.10,
  author =	{Baumann, Pascal and Madnani, Khushraj and Mazowiecki, Filip and Zetzsche, Georg},
  title =	{{Monus Semantics in Vector Addition Systems with States}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{10:1--10:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.10},
  URN =		{urn:nbn:de:0030-drops-190047},
  doi =		{10.4230/LIPIcs.CONCUR.2023.10},
  annote =	{Keywords: Vector addition systems, Overapproximation, Reachability, Coverability}
}

Document

DOI: 10.4230/LIPIcs.CONCUR.2023.11

Subtyping Context-Free Session Types

Authors: Gil Silva, Andreia Mordido, and Vasco T. Vasconcelos

Published in: LIPIcs, Volume 279, 34th International Conference on Concurrency Theory (CONCUR 2023)

Abstract

Context-free session types describe structured patterns of communication on heterogeneously typed channels, allowing the specification of protocols unconstrained by tail recursion. The enhanced expressive power provided by non-regular recursion comes, however, at the cost of the decidability of subtyping, even if equivalence is still decidable. We present an approach to subtyping context-free session types based on a novel kind of observational preorder we call XYZW-simulation, which generalizes XY-simulation (also known as covariant-contravariant simulation) and therefore also bisimulation and plain simulation. We further propose a subtyping algorithm that we prove to be sound, and present an empirical evaluation in the context of a compiler for a programming language. Due to the general nature of the simulation relation upon which it is built, this algorithm may also find applications in other domains.

Cite as

Gil Silva, Andreia Mordido, and Vasco T. Vasconcelos. Subtyping Context-Free Session Types. In 34th International Conference on Concurrency Theory (CONCUR 2023). Leibniz International Proceedings in Informatics (LIPIcs), Volume 279, pp. 11:1-11:19, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2023)

Copy BibTex To Clipboard

@InProceedings{silva_et_al:LIPIcs.CONCUR.2023.11,
  author =	{Silva, Gil and Mordido, Andreia and Vasconcelos, Vasco T.},
  title =	{{Subtyping Context-Free Session Types}},
  booktitle =	{34th International Conference on Concurrency Theory (CONCUR 2023)},
  pages =	{11:1--11:19},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-299-0},
  ISSN =	{1868-8969},
  year =	{2023},
  volume =	{279},
  editor =	{P\'{e}rez, Guillermo A. and Raskin, Jean-Fran\c{c}ois},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops-dev.dagstuhl.de/entities/document/10.4230/LIPIcs.CONCUR.2023.11},
  URN =		{urn:nbn:de:0030-drops-190055},
  doi =		{10.4230/LIPIcs.CONCUR.2023.11},
  annote =	{Keywords: Session types, Subtyping, Simulation, Simple grammars, Non-regular recursion}
}

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