1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
|
///////////////////////////////////////////////////////////////////////////////
//
/// \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(_WIN32) || defined(__CYGWIN__)
# ifndef _WIN32_WINNT
# define _WIN32_WINNT 0x0500
# endif
# include <windows.h>
// glibc >= 2.9
#elif defined(TUKLIB_CPUCORES_SCHED_GETAFFINITY)
# include <sched.h>
// FreeBSD
#elif defined(TUKLIB_CPUCORES_CPUSET)
# include <sys/param.h>
# include <sys/cpuset.h>
#elif 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(_WIN32) || defined(__CYGWIN__)
SYSTEM_INFO sysinfo;
GetSystemInfo(&sysinfo);
ret = sysinfo.dwNumberOfProcessors;
#elif defined(TUKLIB_CPUCORES_SCHED_GETAFFINITY)
cpu_set_t cpu_mask;
if (sched_getaffinity(0, sizeof(cpu_mask), &cpu_mask) == 0)
ret = (uint32_t)CPU_COUNT(&cpu_mask);
#elif defined(TUKLIB_CPUCORES_CPUSET)
cpuset_t set;
if (cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1,
sizeof(set), &set) == 0) {
# ifdef CPU_COUNT
ret = (uint32_t)CPU_COUNT(&set);
# else
for (unsigned i = 0; i < CPU_SETSIZE; ++i)
if (CPU_ISSET(i, &set))
++ret;
# endif
}
#elif defined(TUKLIB_CPUCORES_SYSCTL)
// On OpenBSD HW_NCPUONLINE tells the number of processor cores that
// are online so it is preferred over HW_NCPU which also counts cores
// that aren't currently available. The number of cores online is
// often less than HW_NCPU because OpenBSD disables simultaneous
// multi-threading (SMT) by default.
# ifdef HW_NCPUONLINE
int name[2] = { CTL_HW, HW_NCPUONLINE };
# else
int name[2] = { CTL_HW, HW_NCPU };
# endif
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;
#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 = (uint32_t)cpus;
#elif defined(TUKLIB_CPUCORES_PSTAT_GETDYNAMIC)
struct pst_dynamic pst;
if (pstat_getdynamic(&pst, sizeof(pst), 1, 0) != -1)
ret = (uint32_t)pst.psd_proc_cnt;
#endif
return ret;
}
|
