Re: [BLACKBOX] [Fwd: Re: [BLACKBOX] Long running command and Dialog.ShowStatus]

From: [at]} <Bob>
Date: Sat, 5 Dec 2009 11:10:22 -0000

----boundary-LibPST-iamunique-1054093884_-_-
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> It's always possible to rewrite a program which has inner
> loops into the equivalent program with a single loop, without
> resorting to awkward logic.

I thought it might be of some interest to people for me to back up my claim
with an example. Coincidentally I have been reading "The Design of the UNIX
Operating System" by Maurice J Bach, so I have used his state transition
diagram (Figure 2.6 in the book) of unix process states and transitions to
illustrate my point. My version of the STD is at
<http://www.web-options.com/UnixProcessSTD.htm>. The equivalent state table
is at <http://www.web-options.com/ProcessSTT.htm>.

The attached module contains 3 procedures which are essentially syntax
analysers for Bach's STD.

Background.A is based on my ebnf version of the STD which I have coded
following the usual principles for coding from ebnf. It contains nested
loops and conditions and would be difficult to use effectively with
Services.DoLater.

Background.B is an equivalent based on the STD and does not use
Services.DoLater. It shows that the same structure can be coded simply and
efficiently without nested loops - just one outer loop.

Background.C is a refinement of the STD version which uses Services.Do
Later. It shows how easy it is to convert a STD-based algorithm to use
Service.DoLater and I think it shows that if you need to write a
long-running process for BB or ETH Oberon it is better to design
specifically for it, using the state-transition method rather than the more
Wirthian method based on EBNF.

Note however that Services.DoLater carries a very heavy performance penalty!

Bob

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> -----Original Message-----
> From: Bob Walkden [mailto:bob{([at]})nowhere.xy
> Sent: 03 December 2009 23:25
> To: 'BlackBox'
> Subject: RE: [BLACKBOX] [Fwd: Re: [BLACKBOX] Long running
> command and Dialog.ShowStatus]
>
> [...]
> >
> > 2) But the logic involved in using Actions can be very
> awkward. If the
> > task is a simple loop, as in this example, it is not too
> bad. But if
> > the task is several nested loops, and you need to be able
> to interrupt
> > it partly through the inner loop, it is less easy (but
> possible, and
> > sometimes necessary).
> >
> > Surely these problems (apparent hanging of BlackBox, and
> the fact that
> > Ctrl-Break does not work as advertised) can and should be
> solved at a
> > lower level than imposing lots of awkward logic into every
> > application?
>
> It's always possible to rewrite a program which has inner
> loops into the equivalent program with a single loop, without
> resorting to awkward logic.
>
> Structured programming encouraged us to design our algorithms
> to match our data structures, and this close match leads
> naturally to nested loops. However, any design based on say
> EBNF can be transformed straightforwardly into the equivalent
> design using statecharts. Statecharts (and more particularly
> state tables) lead quite naturally to a structure containing
> only one loop, with the state variable & current input event
> determining what happens next.
>
> Although I haven't used Actions for anything serious, I think
> the approach to designing a bit of software for it is to
> treat it as an event-driven design based on statecharts. This
> would also work with the original ETH Oberon keyboard / mouse
> / network loop and seems appropriate for a single-user system
> without the overhead of threads or the need for statements
> which let the program breathe, and suchlike.
>
> Bob

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Received on Sat Dec 05 2009 - 12:10:22 UTC