The EAPLS Best Paper Award 2021

The EAPLS Best Paper Award 2021 is awarded to the paper

 "General Decidability Results for Asynchronous Shared-Memory Programs: Higher-Order and Beyond", by Rupak Majumdar, Ramanathan S. Thinniyam and Georg Zetzsche (Max Planck Institute for Software Systems (MPI-SWS), Kaiserslautern, Germany).

This paper has been published in the proceedings of the 27th International Conference on Tools and Algorithms for the Construction and Analysis of Systems (TACAS 2021). Congratulations to the authors!

The abstract of the paper:

The model of asynchronous programming arises in many contexts, from low-level systems software to high-level web programming. We take a language-theoretic perspective and show general decidability and undecidability results for asynchronous programs that capture all known results as well as show decidability of new and important classes. As a main consequence, we show decidability of safety, termination and boundedness verification for higher-order asynchronous programs—such as OCaml programs using Lwt—and undecidability of liveness verification already for order-2 asynchronous programs. We show that under mild assumptions, surprisingly, safety and termination verification of asynchronous programs with handlers from a language class are decidable iff emptiness is decidable for the underlying language class. Moreover, we show that configuration reachability and liveness (fair termination) verification are equivalent, and decidability of these problems implies decidability of the well-known “equal-letters” problem on languages. Our results close the decidability frontier for asynchronous programs.

Link to publication:

https://link.springer.com/chapter/10.1007/978-3-030-72016-2_24