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Semantics and Termination of Simply-Moded Logic Programs with Dynamic Scheduling

Annalisa Bossi·Sandro Etalle·Sabina Rossi·Jan-Georg Smaus
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Abstract

In logic programming, dynamic scheduling refers to a situation where the selection of the atom in each resolution (computation) step is determined at runtime, as opposed to a fixed selection rule such as the left-to-right one of Prolog. This has applications e.g. in parallel programming. A mechanism to control dynamic scheduling is provided in existing languages in the form of delay declarations. Input-consuming derivations were introduced to describe dynamic scheduling while abstracting from the technical details. In this paper, we first formalise the relationship between delay declarations and input-consuming derivations, showing in many cases a one-to-one correspondence. Then, we define a model-theoretic semantics for input-consuming derivations of simply-moded programs. Finally, for this class of programs, we provide a necessary and sufficient criterion for termination.

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Annalisa Bossi, Sandro Etalle, Sabina Rossi, Jan-Georg Smaus. 2001-01-23. Semantics and Termination of Simply-Moded Logic Programs with Dynamic Scheduling. https://arxiv.org/abs/cs/0101022

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