🚀 go-pugleaf

In article <rlogin.724966959@dutncp8> rob@pact.nl (Rob Kurver) writes:
>In <1992Dec21.132719.23839@hubcap.clemson.edu> ka@wan.inf.rl.ac.uk( (Khalid Akram \(student-david;until 31/12/92\)) writes:
>
>>how does one implement discriminated protocols using INMOS ANSI C?
>
>In C (ANY transputer C), you can simply use a union and send that with
>a single channel input/output pair (be they function calls or language
>constructs or whatever).  Unless one member of the union is very much
>larger than the other, and not sent very often, the overhead of sending
>a larger message is usually compensated by the single input/output.
>
>If you find you're transferring too much data this way, you can explicitly
>input/output the union tag first, followed by the right body for the
>tag.

Yes, if all your sizes are even close:

struct _foo {
	char foo_tag;		/* union tag */
	union {			/* I forget if INMOS C has unnamed unions */
		struct foo1 foo1;
		struct foo2 foo2;
		etc...
	};
};

Jeff

>
>Rob
>
>--
>     PACT                   Rob Kurver
>    Foulkeslaan 87         rob@pact.nl
>   2625 RB Delft     ph: +31 15 616864 
>  The Netherlands   fax: +31 15 610032


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