blob: 0ee03631da8f7cb060ee38da24cc63204f4ccb77 (
plain)
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
|
/*
Copyright (c) 2006, 2010, Oracle and/or its affiliates
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/* get the number of (online) CPUs */
#include "mysys_priv.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#if defined(__FreeBSD__) && defined(HAVE_PTHREAD_GETAFFINITY_NP)
#include <pthread_np.h>
#include <sys/cpuset.h>
#endif
static int ncpus=0;
int my_getncpus(void)
{
#if (defined(__linux__) || defined(__FreeBSD__)) && defined(HAVE_PTHREAD_GETAFFINITY_NP)
cpu_set_t set;
if (!ncpus)
{
if (pthread_getaffinity_np(pthread_self(), sizeof(set), &set) == 0)
{
ncpus= CPU_COUNT(&set);
}
else
{
#ifdef _SC_NPROCESSORS_ONLN
ncpus= sysconf(_SC_NPROCESSORS_ONLN);
#else
ncpus= 2;
#endif
}
}
#else /* __linux__ || FreeBSD && HAVE_PTHREAD_GETAFFINITY_NP */
if (!ncpus)
{
#ifdef _SC_NPROCESSORS_ONLN
ncpus= sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(__WIN__)
SYSTEM_INFO sysinfo;
/*
* We are not calling GetNativeSystemInfo here because (1) we
* don't believe that they return different values for number
* of processors and (2) if WOW64 limits processors for Win32
* then we don't want to try to override that.
*/
GetSystemInfo(&sysinfo);
ncpus= sysinfo.dwNumberOfProcessors;
#else
/* unknown so play safe: assume SMP and forbid uniprocessor build */
ncpus= 2;
#endif
}
#endif /* __linux__ || FreeBSD && HAVE_PTHREAD_GETAFFINITY_NP */
return ncpus;
}
|
