TaDA Live: Compositional Reasoning for Termination of Fine-grained Concurrent Programs
We present TaDA Live, a concurrent separation logic for reasoning compositionally about the termination of blocking fine-grained concurrent programs. The crucial challenge is how to deal with abstract atomic blocking: that is, abstract atomic operations that have blocking behaviour arising from busy-waiting patterns as found in, for example, fine-grained spin locks. Our fundamental innovation is with the design of abstract specifications that capture this blocking behaviour as liveness assumptions on the environment. We design a logic that can reason about the termination of clients that use such operations without breaking their abstraction boundaries, and the correctness of the implementations of the operations with respect to their abstract specifications. We introduce a novel semantic model using layered subjective obligations to express liveness invariants and a proof system that is sound with respect to the model. The subtlety of our specifications and reasoning is illustrated using several case studies.
Fri 21 JanDisplayed time zone: Eastern Time (US & Canada) change
13:30 - 14:45
|Armed cats: formal concurrency modelling at ArmRemote
|TaDA Live: Compositional Reasoning for Termination of Fine-grained Concurrent Programs Remote
Emanuele D’Osualdo MPI-SWS, Julian Sutherland Imperial College London, Azadeh Farzan University of Toronto, Philippa Gardner Imperial College LondonDOI
|Gradualizing the Calculus of Inductive ConstructionsRemote