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///////////////////////////////////////////////////////////////////////////////
//
/// \file cpucores.h
/// \brief Get the number of online CPU cores
//
// Author: Lasse Collin
//
// This file has been put into the public domain.
// You can do whatever you want with this file.
//
///////////////////////////////////////////////////////////////////////////////
#ifndef CPUCORES_H
#define CPUCORES_H
#if defined(HAVE_CPUCORES_SYSCONF)
# include <unistd.h>
#elif defined(HAVE_CPUCORES_SYSCTL)
# ifdef HAVE_SYS_PARAM_H
# include <sys/param.h>
# endif
# ifdef HAVE_SYS_SYSCTL_H
# include <sys/sysctl.h>
# endif
#endif
static inline uint32_t
cpucores(void)
{
uint32_t ret = 0;
#if defined(HAVE_CPUCORES_SYSCONF)
const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (cpus > 0)
ret = (uint32_t)(cpus);
#elif defined(HAVE_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 = (uint32_t)(cpus);
#endif
return ret;
}
#endif
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