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///////////////////////////////////////////////////////////////////////////////
//
/// \file tuklib_cpucores.c
/// \brief Get the number of CPU cores online
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#include "tuklib_cpucores.h"
#if defined(TUKLIB_CPUCORES_SYSCTL)
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# include <sys/sysctl.h>
#elif defined(TUKLIB_CPUCORES_SYSCONF)
# include <unistd.h>
// HP-UX
#elif defined(TUKLIB_CPUCORES_PSTAT_GETDYNAMIC)
# include <sys/param.h>
# include <sys/pstat.h>
#endif
extern uint32_t
tuklib_cpucores(void)
{
uint32_t ret = 0;
#if defined(TUKLIB_CPUCORES_SYSCTL)
int name[2] = { CTL_HW, HW_NCPU };
int cpus;
size_t cpus_size = sizeof(cpus);
if (sysctl(name, 2, &cpus, &cpus_size, NULL, 0) != -1
&& cpus_size == sizeof(cpus) && cpus > 0)
ret = cpus;
#elif defined(TUKLIB_CPUCORES_SYSCONF)
# ifdef _SC_NPROCESSORS_ONLN
// Most systems
const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
# else
// IRIX
const long cpus = sysconf(_SC_NPROC_ONLN);
# endif
if (cpus > 0)
ret = cpus;
#elif defined(TUKLIB_CPUCORES_PSTAT_GETDYNAMIC)
struct pst_dynamic pst;
if (pstat_getdynamic(&pst, sizeof(pst), 1, 0) != -1)
ret = pst.psd_proc_cnt;
#endif
return ret;
}
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