blob: 5be961e3bc91ba55335b44e4bc18e73afd8ef57c (
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
|
/* Copyright (C) 2006 MySQL AB, 2008-2009 Sun Microsystems, Inc
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/* get the number of (online) CPUs */
#include "mysys_priv.h"
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
static int ncpus=0;
int my_getncpus()
{
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
}
return ncpus;
}
|
