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A Preliminary Study of Hierarchical Finite State Machines with Multiple Concurrency Models


Alain Girault, Bilung Lee, and Edward A. Lee

Superseded by Hierarchical Finite State Machines with Multiple Concurrency Models

Technical Memorandum UCB/ERL M97/57
Electronics Research Laboratory, Berkeley, CA 94720

[Postscript] [PDF]

ABSTRACT

This paper studies the semantics of hierarchical finite-state machines that are composed using various concurrency models, particularly dataflow, discrete-events, and synchronous/reactive modeling. It is argued that all three combinations are useful, and that therefore the concurrency model should be selected independently of the decision to use hierarchical FSMs. In contrast, most formalisms that combine FSMs with concurrency models, such as Statecharts (and its variants) and Hybrid systems, tightly integrate the FSM semantics with the concurrency semantics. An implementation that supports the three combinations studied is described.
Send comments to Edward A. Lee at eal@eecs.berkeley.edu.