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A CSP model of Eiffel's SCOOP

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JournalFormal Aspects of Computing
DatePublished - Nov 2007
Issue number4
Volume19
Number of pages25
Pages (from-to)487-512
Original languageEnglish

Abstract

The current informal semantics of the simple concurrent object-oriented programming (SCOOP) mechanism for Eiffel is described. We construct and discuss a model using the process algebra CSP. This model gives a more formal semantics for SCOOP than existed previously.

We implement the model mechanically via a new tool called CSPsim. We examine two semantic variations of SCOOP: when and how far to pass locks, and when to wait for child calls to complete. We provide evidence that waiting for child calls to complete both unnecessarily reduces parallelism without any increase in safety and increases deadlocks involving callbacks.

Through the creation and analysis of the model, we identify a number of ambiguities relating to reservations and the underlying run-time system and propose means to resolve them.

    Research areas

  • concurrency, formal methods, programming languages, Eiffel, SCOOP

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