[rfc] gcc trunk - libgomp thread affinity for freebsd

[Jakub Jelinek]

On Wed, May 06, 2015 at 04:29:02PM -0700, Adrian Chadd wrote:
> This patch implements basic top level thread affinity support for
> freebsd. It doesn't yet implement thread affinity support for
> core/socket grouping yet; I'm working on a library to extract that out
> to userland and plan on teaching libgomp about it at a later stage.
> 
> https://people.freebsd.org/~adrian/gcc/20150506-gcc-trunk-libgomp-1.diff
> 
> I'd appreciate feedback/review.

In affinity.c, that sounds like way too much code duplication, besides
slightly different includes (but, seems it is only added ones, not removed),
the only differences I see are:
1) you are assuming HAVE_PTHREAD_AFFINITY_NP is defined, is that really
needed?  The configure test should pass and define this macro if you have
it
2) cpu_set_t vs. cpuset_t
3) assuming CPU_ALLOC_SIZE is not defined and so aren't CPU_*_S
4) gomp_cpuset_popcount vs. CPU_COUNT
5) gomp_affinity_init_level is different

1) and 3) can be IMHO kept as is, for 2)/4) you could just add
a short config/freebsd/affinity.c wrapper that includes right headers,
defines a few macros and finally #include "../linux/affinity.c"
For 5), guess that function could be moved into some header
(affinity-init.h) and you could have a different version in config/linux and
config/freebsd.  As you add your own proc.c, I guess for 4) also
just defining your own gomp_cpuset_popcount in there would work too.

	Jakub