SHM

[Gary E. Miller]

Yo Hal!

On Fri, 06 May 2016 13:56:43 -0700
Hal Murray <hmurray at megapathdsl.net> wrote:

> > Are we presently using the old one?  Where is documentation for the
> > new one?  
> 
> Do the old and new SHM schemes share the same name space?  If gpsd
> uses old, can a ntpd using new talk to it?

No, fundamentally incompatible at the ABI level.  So it would have
to be a totally new refclock.  Unless we find another QNX type issue
that needs fixing, a half step not worth making.  Better to work on
refclockd and fixing current refclocks.

But, just to totally muddy the water...

Some people worry about the latency issues in the JSON.  I doubt they exist,
but if they did, then the solution would be to run JSON through shm_open()
style shared memory.  We get file system style security and shared memory
style speed!

So just keep shm_open() in the back of your mind, someday it might be a
solution to a hard problem.

RGDS
GARY
---------------------------------------------------------------------------
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
	gem at rellim.com  Tel:+1 541 382 8588
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