Abstract
Re-establishing a safe program state after an error occurred is a known problem. Manually written error-recovery code is both more difficult to test and less often executed than the main code paths, hence errors are prevalent in these parts of a program. This paper proposes a failure model for concurrent objects with cooperative scheduling that automatically re-establishes object invariants after program failures, thereby eliminating the need to manually write this problematic code. The proposed model relies on a number of features of actor-based object-oriented languages, such as asynchronous method calls, co-operative scheduling with explicit synchronization points, and communication via future variables. We show that this approach can be used to implement Erlang-style process linking, and implement a supervision tree as a proof-of-concept.
Partially funded by the EU project FP7-610582 ENVISAGE: Engineering Virtualized Services (http://www.envisage-project.eu).
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Göri, G., Johnsen, E.B., Schlatte, R., Stolz, V. (2014). Erlang-Style Error Recovery for Concurrent Objects with Cooperative Scheduling. In: Margaria, T., Steffen, B. (eds) Leveraging Applications of Formal Methods, Verification and Validation. Specialized Techniques and Applications. ISoLA 2014. Lecture Notes in Computer Science, vol 8803. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-662-45231-8_2
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