> So you are correct that some clients may use the SHM protocol in rw mode.
> Can't imagine why...

Does gpsd write in mode 0 or mode 1?

In mode 0, the reader has to turn off the valid flag so needs writing.

Mode 1 isn't solid.  It's only got one counter.  Clean read-only operation 
needs 2 counters.

-- 
These are my opinions.  I hate spam.



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