Transferring Obligations Through Synchronizations

Authors Jafar Hamin , Bart Jacobs



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Author Details

Jafar Hamin
  • imec-DistriNet, Department of Computer Science, KU Leuven, Belgium
Bart Jacobs
  • imec-DistriNet, Department of Computer Science, KU Leuven, Belgium

Acknowledgements

We thank three anonymous reviewers for their careful reading of our manuscript and their many insighful comments and suggestions, and also Amin Timany for his guidance on Coq.

Cite AsGet BibTex

Jafar Hamin and Bart Jacobs. Transferring Obligations Through Synchronizations. In 33rd European Conference on Object-Oriented Programming (ECOOP 2019). Leibniz International Proceedings in Informatics (LIPIcs), Volume 134, pp. 19:1-19:58, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2019)
https://doi.org/10.4230/LIPIcs.ECOOP.2019.19

Abstract

One common approach for verifying safety properties of multithreaded programs is assigning appropriate permissions, such as ownership of a heap location, and obligations, such as an obligation to send a message on a channel, to each thread and making sure that each thread only performs the actions for which it has permissions and it also fulfills all of its obligations before it terminates. Although permissions can be transferred through synchronizations from a sender thread, where for example a message is sent or a condition variable is notified, to a receiver thread, where that message or that notification is received, in existing approaches obligations can only be transferred when a thread is forked. In this paper we introduce two mechanisms, one for channels and the other for condition variables, that allow obligations, along with permissions, to be transferred from the sender to the receiver, while ensuring that there is no state where the transferred obligations are lost, i.e. where they are discharged from the sender thread but not loaded onto the receiver thread yet. We show how these mechanisms can be used to modularly verify deadlock-freedom of a number of interesting programs, such as some variations of client-server programs, fair readers-writers locks, and dining philosophers, which cannot be modularly verified without such transfer. We also encoded the proposed separation logic-based proof rules in the VeriFast program verifier and succeeded in verifying the mentioned programs.

Subject Classification

ACM Subject Classification
  • Theory of computation → Separation logic
  • Software and its engineering → Deadlocks
  • Software and its engineering → Process synchronization
  • Software and its engineering → Formal software verification
  • Theory of computation → Hoare logic
Keywords
  • Hoare logic
  • separation logic
  • modular program verification
  • synchronization
  • transferring obligations
  • deadlock-freedom

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