#elif defined(HAVE_UNISTD) && defined(_SC_NPROCESSORS_ONLN)
int const count=sysconf(_SC_NPROCESSORS_ONLN);
return (count>0)?count:0;
#elif defined(HAVE_UNISTD) && defined(_SC_NPROCESSORS_ONLN)
int const count=sysconf(_SC_NPROCESSORS_ONLN);
return (count>0)?count:0;