On 17/05/2016 08:18 AM, scott wrote:
> Thanks for the ideas everyone.

No problem. I enjoy interesting problems. ;-)

> Just looked up named pipes - it seems you can only have a single
> "reader"? I need more than one process to be able to see the signal.

Yeah, you would need one named pipe per process.

> Sockets should work ok, or as you state, just create/delete an empty
> file somewhere. I'll have to experiment.

Good luck. ;-)

> I guess at some point I might
> want to expand the signal to more than one pin, so being able to
> communicate an "int" rather than a "bool" would actually be more scalable.

Sure thing. I can certainly understand that. Putting the contents into a 
small file seems the simplest way. (I'm not 100% sure of the semantics 
of multiple processes accessing a file concurrently - unless it's via 
mmap...)

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