Re: [gpsd-dev] Updated docs on NTP segment management

[Eric S. Raymond]

Harlan Stenn <address@hidden>:
> http://clang.llvm.org/docs/LanguageExtensions.html has some info about
> clang and memory barrier intrinsics, but they seem to be for ARM only.
> 
> I'd hope that somebody has written a library of these things for
> different compilers (including AIX, Solaris, and some other platforms).
> 
> I haven't looked in to this stuff much though.
> 
> I'm game to have a libntpshm/ tear-off (unless there's a better name for
> it) that we could use for all of this, that would be shared between at
> least NTP and GPSD.  I know some other folks use this code as well, but
> they are not real loud about it.

If read/write access is a concern it's probaby time to look beyond
shared segments with roll-your-own locking to something like POSIX
message queues.

I could design and implement a facility like that, given a reasonably
well-thought-out set of requirements.  It's the kind of thing I'm good
at.
-- 
                <a href="http://www.catb.org/~esr/";>Eric S. Raymond</a>