g_atomic_int_compare_and_exchange

[Thomas Stover <thomas wsinnovations com>]

I was just looking at gatomic.c to see if
g_atomic_int_compare_and_exchange() would work on an integer inside memory
obtained by mmap(MAP_SHARED) safely between processes. With my limited
understanding it looks like it probably would except for the cases when it
has to fall back to g_mutex_()* ops on g_atomic_mutex. I started to look at
gthread.c to see if the mutex implementations themselves might be based on
inter-process capable mutex technologies, but I'm not following along so
well in there. 

So my questions are:
-were any of the atomic functions intended for process shared memory or
just thread shared memory?

-even if that is not the case, would the non-mutex based implementations
work in that fashion?

-is there a way to test for what implementation is being used? (if it
maters)



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