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101 lines
2.3 KiB
101 lines
2.3 KiB
3 years ago
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file tuklib_cpucores.c
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/// \brief Get the number of CPU cores online
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "tuklib_cpucores.h"
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#if defined(_WIN32) || defined(__CYGWIN__)
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# ifndef _WIN32_WINNT
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# define _WIN32_WINNT 0x0500
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# endif
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# include <windows.h>
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// glibc >= 2.9
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#elif defined(TUKLIB_CPUCORES_SCHED_GETAFFINITY)
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# include <sched.h>
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// FreeBSD
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#elif defined(TUKLIB_CPUCORES_CPUSET)
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# include <sys/param.h>
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# include <sys/cpuset.h>
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#elif defined(TUKLIB_CPUCORES_SYSCTL)
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# ifdef HAVE_SYS_PARAM_H
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# include <sys/param.h>
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# endif
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# include <sys/sysctl.h>
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#elif defined(TUKLIB_CPUCORES_SYSCONF)
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# include <unistd.h>
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// HP-UX
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#elif defined(TUKLIB_CPUCORES_PSTAT_GETDYNAMIC)
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# include <sys/param.h>
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# include <sys/pstat.h>
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#endif
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extern uint32_t
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tuklib_cpucores(void)
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{
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uint32_t ret = 0;
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#if defined(_WIN32) || defined(__CYGWIN__)
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SYSTEM_INFO sysinfo;
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GetSystemInfo(&sysinfo);
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ret = sysinfo.dwNumberOfProcessors;
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#elif defined(TUKLIB_CPUCORES_SCHED_GETAFFINITY)
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cpu_set_t cpu_mask;
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if (sched_getaffinity(0, sizeof(cpu_mask), &cpu_mask) == 0)
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ret = (uint32_t)CPU_COUNT(&cpu_mask);
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#elif defined(TUKLIB_CPUCORES_CPUSET)
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cpuset_t set;
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if (cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1,
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sizeof(set), &set) == 0) {
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# ifdef CPU_COUNT
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ret = (uint32_t)CPU_COUNT(&set);
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# else
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for (unsigned i = 0; i < CPU_SETSIZE; ++i)
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if (CPU_ISSET(i, &set))
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++ret;
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# endif
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}
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#elif defined(TUKLIB_CPUCORES_SYSCTL)
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int name[2] = { CTL_HW, HW_NCPU };
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int cpus;
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size_t cpus_size = sizeof(cpus);
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if (sysctl(name, 2, &cpus, &cpus_size, NULL, 0) != -1
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&& cpus_size == sizeof(cpus) && cpus > 0)
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ret = (uint32_t)cpus;
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#elif defined(TUKLIB_CPUCORES_SYSCONF)
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# ifdef _SC_NPROCESSORS_ONLN
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// Most systems
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const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
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# else
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// IRIX
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const long cpus = sysconf(_SC_NPROC_ONLN);
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# endif
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if (cpus > 0)
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ret = (uint32_t)cpus;
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#elif defined(TUKLIB_CPUCORES_PSTAT_GETDYNAMIC)
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struct pst_dynamic pst;
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if (pstat_getdynamic(&pst, sizeof(pst), 1, 0) != -1)
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ret = (uint32_t)pst.psd_proc_cnt;
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#endif
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return ret;
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}
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