1 ///////////////////////////////////////////////////////////////////////////////
3 /// \file tuklib_cpucores.c
4 /// \brief Get the number of CPU cores online
6 // Author: Lasse Collin
8 // This file has been put into the public domain.
9 // You can do whatever you want with this file.
11 ///////////////////////////////////////////////////////////////////////////////
13 #include "tuklib_cpucores.h"
15 #if defined(_WIN32) || defined(__CYGWIN__)
17 # define _WIN32_WINNT 0x0500
22 #elif defined(TUKLIB_CPUCORES_CPUSET)
23 # include <sys/param.h>
24 # include <sys/cpuset.h>
26 #elif defined(TUKLIB_CPUCORES_SYSCTL)
27 # ifdef HAVE_SYS_PARAM_H
28 # include <sys/param.h>
30 # include <sys/sysctl.h>
32 #elif defined(TUKLIB_CPUCORES_SYSCONF)
36 #elif defined(TUKLIB_CPUCORES_PSTAT_GETDYNAMIC)
37 # include <sys/param.h>
38 # include <sys/pstat.h>
47 #if defined(_WIN32) || defined(__CYGWIN__)
49 GetSystemInfo(&sysinfo);
50 ret = sysinfo.dwNumberOfProcessors;
52 #elif defined(TUKLIB_CPUCORES_CPUSET)
54 if (cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1,
55 sizeof(set), &set) == 0) {
57 ret = CPU_COUNT(&set);
59 for (unsigned i = 0; i < CPU_SETSIZE; ++i)
60 if (CPU_ISSET(i, &set))
65 #elif defined(TUKLIB_CPUCORES_SYSCTL)
66 int name[2] = { CTL_HW, HW_NCPU };
68 size_t cpus_size = sizeof(cpus);
69 if (sysctl(name, 2, &cpus, &cpus_size, NULL, 0) != -1
70 && cpus_size == sizeof(cpus) && cpus > 0)
73 #elif defined(TUKLIB_CPUCORES_SYSCONF)
74 # ifdef _SC_NPROCESSORS_ONLN
76 const long cpus = sysconf(_SC_NPROCESSORS_ONLN);
79 const long cpus = sysconf(_SC_NPROC_ONLN);
84 #elif defined(TUKLIB_CPUCORES_PSTAT_GETDYNAMIC)
85 struct pst_dynamic pst;
86 if (pstat_getdynamic(&pst, sizeof(pst), 1, 0) != -1)
87 ret = pst.psd_proc_cnt;