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#include "cache.h"

#ifdef _WIN32
# define WIN32_LEAN_AND_MEAN
# include <windows.h>
#elif defined(hpux) || defined(__hpux) || defined(_hpux)
# include <sys/pstat.h>
#endif

/*
* By doing this in two steps we can at least get
* the function to be somewhat coherent, even
* with this disgusting nest of #ifdefs.
*/
#ifndef _SC_NPROCESSORS_ONLN
# ifdef _SC_NPROC_ONLN
# define _SC_NPROCESSORS_ONLN _SC_NPROC_ONLN
# elif defined _SC_CRAY_NCPU
# define _SC_NPROCESSORS_ONLN _SC_CRAY_NCPU
# endif
#endif

int online_cpus(void)
{
#ifdef _SC_NPROCESSORS_ONLN
long ncpus;
#endif

#ifdef _WIN32
SYSTEM_INFO info;
GetSystemInfo(&info);

if ((int)info.dwNumberOfProcessors > 0)
return (int)info.dwNumberOfProcessors;
#elif defined(hpux) || defined(__hpux) || defined(_hpux)
struct pst_dynamic psd;

if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
return (int)psd.psd_proc_cnt;
#endif

#ifdef _SC_NPROCESSORS_ONLN
if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
return (int)ncpus;
#endif

return 1;
}
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