omp_get_num_procs() not working on macintosh?

[Paolo Bonzini]

> If so, someone familiar with Darwin needs to provide (a tested) darwin specific
> proc.c implementation which can be added to libgomp/config/darwin/proc.c
> to replace the libgomp/config/posix/proc.c version.

Here is code that does so:

   #include <sys/types.h>
   #include <sys/sysctl.h>

   int main()
   {
     int mib[2] = { CTL_HW, HW_AVAILCPU };
     int result, len;
     len = sizeof (result);
     sysctl (mib, 2, &result, &len, NULL, 0);
     printf ("%d\n", result);
   }

If you need to retrieve the number of processors in the system (i.e. the 
upper bound to HW_AVAILCPU, because the latter may change if a different 
power management modes is activated), you should use HW_NCPU instead.

Paolo