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Towards Static Deadlock Resolution in the \(\pi \)-Calculus

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Trustworthy Global Computing (TGC 2013)

Part of the book series: Lecture Notes in Computer Science ((LNTCS,volume 8358))

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Abstract

Static analysis techniques based on session types discern concurrent programs that ensure the fidelity of protocol sessions – for each input (output) end point of a session there is exactly an output (input) end point available – being expressive enough to represent the standard \(\pi \)-calculus and several typing disciplines. More advanced type systems, enforcing properties as deadlock-freedom or even progress, sensibly reduce the set of typed processes, thus mining the expressiveness of the analysis. Herein, we propose a first step towards a compromise solution to this problem: a session based type checking algorithm that releases some deadlocks (when co-actions on the same channel occur in sequence in a thread). This procedure may help the software development process: the typing algorithm detects a deadlock, but instead of rejecting the code, fixes it by looking into the session types and producing new safe code that obeys the protocols and is deadlock-free.

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Notes

  1. 1.

    The procedure is still at an experimental stage; we do not discuss it here.

  2. 2.

    While most of the examples do not require the use of restriction, we limit the scope of channels to help the comprehension of the reader.

  3. 3.

    The subject variables of a sound process is indeed a set.

  4. 4.

    When convenient, we will say “type disentangle” to mean resolution of a (typed) wait-for sequential deadlock.

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Acknowledgments

This work is partially supported by the Portuguese Fundação para a Ciência e a Tecnologia via project “CITI/FCT/UNL 2011-2012” — grant PEst-OE/EEI/UI0527/2011 and project “Liveness, statically” — grant PTDC/EIA-CCO/117513/2010, and by the COST Action IC1201: Behavioural Types for Reliable Large-Scale Software Systems (BETTY). We would like to thank Adrian Francalanza for fruitful discussions and illuminating examples, and the anonymous reviewers for their careful reading and constructive criticisms.

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Authors and Affiliations

  1. CITI and DI-FCT, Universidade Nova de Lisboa, Lisbon, Portugal

    Marco Giunti & António Ravara

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  1. Marco Giunti
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  2. António Ravara
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Correspondence to Marco Giunti or António Ravara .

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Editors and Affiliations

  1. Microsoft Research, Mountain View, California, USA

    Martín Abadi

  2. IMT Institute for Advanced Studies, Lucca, Italy

    Alberto Lluch Lafuente

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Giunti, M., Ravara, A. (2014). Towards Static Deadlock Resolution in the \(\pi \)-Calculus. In: Abadi, M., Lluch Lafuente, A. (eds) Trustworthy Global Computing. TGC 2013. Lecture Notes in Computer Science(), vol 8358. Springer, Cham. https://doi.org/10.1007/978-3-319-05119-2_9

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  • DOI: https://doi.org/10.1007/978-3-319-05119-2_9

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  • Publisher Name: Springer, Cham

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