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On Fri, 15 Nov 2002, Hans Boldt wrote:

> > However, there's still the issue of having one program call another.  One
> > standalone program cannot call another using a PLIST type of structure.  Is
> > that an issue?  Only for us old OPM dinosuars.  As the Hans's of the world
> > drag us kicking and screaming into the newer models, we'll probably forget
> > about the old PLIST entirely.
>
> Joe: The same issues of inter-program communication affect
> programming in most OS's, as far as I can tell. But again, OS/400
> seems to be the odd one out in that parameter passing between
> programs can indeed be bidi. The single level store probably has a
> lot to do with that, since programs running in different processes

I just had a thought on this:  can't the same thing (passing parms from
one executable to another and back again) be achieved using mmap?  I
haven't ever coded anything that used mmap and it might be a kernel
space only function.  But it does give a type of single level store for a
limited memory space (meaning that two apps access the same memory area).

James Rich



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