Multithreaded Python FSM (Harel State Machines)

[Leonard J. Reder]

Hello, I am sending this out again in hopes that someone will
have some meaningful comments on FSM (finite state machine)
modules avaliable for Python.  Hope to get a reply or two
this time.  Thanks.

Leonard J. Reder wrote:

I have been searching on the web for a specific Python
implementation of a FSM.  More specifically looking
for a Harel State Machine implementation.

The Harel State Machine allows multi-threaded capable state
machines with hierarchical representation capability (nested
instances of state machines).  They also have a unique conditional
trigger symbol scheme for event representation and state machine
transitions.  Usually the multiple threads communicate over some
sort of queue.

I have seen some implementations of simple FSMs and some
interesting descriptions of how the generator/yeild Python keywords can be
used.  I think Python has all the pieces to make a Heral implementation.

Does anyone know of a Python implementation of FSM that comes close to
this functionality?  Any comments or recommendation for FSM packages
that I could add this functionality to would be welcome.  I
certainly think someone has done this approach already.

All replies are very much appreciated.

Thanks for reading this and please reply.

Regards,
Len


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____________________________________________________
Leonard J. Reder
Jet Propulsion Laboratory
Interferometry Systems and Technology Section 383
Email: reder at huey.jpl.nasa.gov
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