Reversible Semantics in Session-based Concurrency

Much research has studied foundations for correct and reliable communication-centric systems. A salient approach to correctness uses session types to enforce structured communications; a recent approach to reliability uses reversible actions as a way of reacting to unanticipated events or failures. This note describes recent work that develops a simple observation: the machinery required to define monitored semantics can also support reversible protocols. We illustrate a process framework of session communication in which monitors support reversibility. A key novelty in our approach are session types with present and past, which allow us to streamline the semantics of reversible actions.