Threader: A Constraint-Based Verifier for Multi-threaded Programs

Ashutosh Gupta, Corneliu Popeea, Andrey Rybalchenko

Abstract: We present a tool that implements Owicki-Gries and rely-guarantee methods for the compositional verification of multi-threaded programs. Our tool computes the requisite auxiliary assertions automatically using an abstraction and refinement procedure. Our procedure is based on a Horn clause encoding of refinement queries and facilitates the discovery of thread-modular proofs when such proofs exist. We present the tool and its evaluation on a collection of benchmarks, including a direct comparison of the effectiveness of the proof rules.