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The SCOOP model provides programmers with a simple extension of Eiffel that allows them to produce high-quality concurrent applications with little more effort than sequential ones. The model is simple yet powerful; nevertheless, its access control policy is pessimistic: (1) all separate actual arguments of a feature call are locked, even if it is not necessary, and (2) at most one client object can access a given supplier object at any time. As a result, SCOOP-based programs are deadlock-prone. Additionally, some interesting synchronisation scenarios, e.g. reader-writer, cannot be implemented efficiently. This paper presents an extended access control policy for SCOOP that makes it possible to specify which arguments of a routine call should be locked; it also allows for shared access to supplier objects thanks to the interleaving of pure query calls. Additionally, we introduce a mechanism for lock-passing that increases the expressive power of the model, thus allowing the programmer to write programs that were impossible to implement in the original SCOOP model.

Refined access control policy for SCOOP