blob: 01dfa3a70e11cf90d3f9ef53d7b65295959abe4f (
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
80
81
82
83
84
|
/*
* ptw32_getprocessors.c
*
* Description:
* This translation unit implements routines which are private to
* the implementation and may be used throughout it.
*
* --------------------------------------------------------------------------
*
* Pthreads-win32 - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999,2003 Pthreads-win32 contributors
*
* Contact Email: rpj@callisto.canberra.edu.au
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* http://sources.redhat.com/pthreads-win32/contributors.html
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library in the file COPYING.LIB;
* if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include "pthread.h"
#include "implement.h"
/*
* ptw32_getprocessors()
*
* Get the number of CPUs available to the process.
*
* If the available number of CPUs is 1 then pthread_spin_lock()
* will block rather than spin if the lock is already owned.
*
* pthread_spin_init() calls this routine when initialising
* a spinlock. If the number of available processors changes
* (after a call to SetProcessAffinityMask()) then only
* newly initialised spinlocks will notice.
*/
int
ptw32_getprocessors(int * count)
{
DWORD_PTR vProcessCPUs;
DWORD_PTR vSystemCPUs;
int result = 0;
if (GetProcessAffinityMask(GetCurrentProcess(),
&vProcessCPUs,
&vSystemCPUs))
{
DWORD_PTR bit;
int CPUs = 0;
for (bit = 1; bit != 0; bit <<= 1)
{
if (vProcessCPUs & bit)
{
CPUs++;
}
}
*count = CPUs;
}
else
{
result = EAGAIN;
}
return(result);
}
|
