2026-07-25T12:51:32Z https://drops.dagstuhl.de/oai

oai:drops-oai.dagstuhl.de:22540 2025-10-02T11:05:34Z ddc:004 open_access

AMECOS: A Modular Event-Based Framework for Concurrent Object Specification Albouy, Timothé Fernández Anta, Antonio Georgiou, Chryssis Gestin, Mathieu Nicolaou, Nicolas Wang, Junlang Concurrency Object specification Consistency conditions Consensus impossibility In this work, we introduce a modular framework for specifying distributed systems that we call AMECOS. Specifically, our framework departs from the traditional use of sequential specification, which presents limitations both on the specification expressiveness and implementation efficiency of inherently concurrent objects, as documented by Castañeda, Rajsbaum and Raynal in CACM 2023. Our framework focuses on the interactions between the various system components, specified as concurrent objects. Interactions are described with sequences of object events. This provides a modular way of specifying distributed systems and separates legality (object semantics) from other issues, such as consistency. We demonstrate the usability of our framework by (i) specifying various well-known concurrent objects, such as registers, shared memory, message-passing, reliable broadcast, and consensus, (ii) providing hierarchies of ordering semantics (namely, consistency hierarchy, memory hierarchy, and reliable broadcast hierarchy), and (iii) presenting a novel axiomatic proof of the impossibility of the well-known Consensus problem. Schloss Dagstuhl – Leibniz-Zentrum für Informatik Timothé Albouy and Antonio Fernández Anta and Chryssis Georgiou and Mathieu Gestin and Nicolas Nicolaou and Junlang Wang 2025 Is Part Of LIPIcs, Volume 324, 28th International Conference on Principles of Distributed Systems (OPODIS 2024) InProceedings Text doc-type:ResearchArticle publishedVersion application/pdf doi:10.4230/LIPIcs.OPODIS.2024.4 urn:nbn:de:0030-drops-225409 https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.OPODIS.2024.4 eng https://creativecommons.org/licenses/by/4.0/legalcode