Timed soft concurrent constraint programs: an interleaved and a parallel approach
Stefano Bistarelli, Univ. of Perugia
Maurizio Gabbrielli, Univ. of Bologna
Maria Chiara Meo, Univ. “G. D’Annunzio” Pescara
Francesco Santini, CWI Amsterdam
Abstract
We propose a timed and soft extension of Concurrent Constraint Programming. The time extension is based on the hypothesis of bounded asynchrony: the computation takes a bounded period of time and is measured by a discrete global clock. Action prefixing is then considered as the syntactic marker which distinguishes a time instant from the next one. Supported by soft constraints instead of crisp ones, tell and ask agents are now equipped with a preference (or consistency) threshold which is used to determine their success or suspension. In the paper we provide a language to describe the agents behavior, together with its operational and denotational semantics, for which we also prove the compositionality and correctness properties. After presenting a semantics using maximal parallelism of actions, we also describe a version for their interleaving on a single processor (with maximal parallelism for time elapsing). Coordinating agents that need to take decisions both on preference values and time events may benefit from this language.
Bibtex (Use it for references)
@article{KEYWORD,
journal = {Theory and Practice of Logic Programming},
publisher = {Cambridge University Press},
author = {Stefano Bistarelli and Maurizio Gabbrielli and Maria Chiara Meo and Francesco Santini },
title = {Timed soft concurrent constraint programs: an interleaved and a parallel approach},
volume = {15},
number = {6},
year = {2015},
pages = {743-782}
}