/[pcsx2_0.9.7]/trunk/3rdparty/w32pthreads/ptw32_getprocessors.c
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Contents of /trunk/3rdparty/w32pthreads/ptw32_getprocessors.c

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Revision 31 - (show annotations) (download)
Tue Sep 7 03:24:11 2010 UTC (9 years, 11 months ago) by william
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committing r3113 initial commit again...
1 /*
2 * ptw32_getprocessors.c
3 *
4 * Description:
5 * This translation unit implements routines which are private to
6 * the implementation and may be used throughout it.
7 *
8 * --------------------------------------------------------------------------
9 *
10 * Pthreads-win32 - POSIX Threads Library for Win32
11 * Copyright(C) 1998 John E. Bossom
12 * Copyright(C) 1999,2005 Pthreads-win32 contributors
13 *
14 * Contact Email: rpj@callisto.canberra.edu.au
15 *
16 * The current list of contributors is contained
17 * in the file CONTRIBUTORS included with the source
18 * code distribution. The list can also be seen at the
19 * following World Wide Web location:
20 * http://sources.redhat.com/pthreads-win32/contributors.html
21 *
22 * This library is free software; you can redistribute it and/or
23 * modify it under the terms of the GNU Lesser General Public
24 * License as published by the Free Software Foundation; either
25 * version 2 of the License, or (at your option) any later version.
26 *
27 * This library is distributed in the hope that it will be useful,
28 * but WITHOUT ANY WARRANTY; without even the implied warranty of
29 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
30 * Lesser General Public License for more details.
31 *
32 * You should have received a copy of the GNU Lesser General Public
33 * License along with this library in the file COPYING.LIB;
34 * if not, write to the Free Software Foundation, Inc.,
35 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
36 */
37
38 #include "ptw32pch.h"
39
40
41 /*
42 * ptw32_getprocessors()
43 *
44 * Get the number of CPUs available to the process.
45 *
46 * If the available number of CPUs is 1 then pthread_spin_lock()
47 * will block rather than spin if the lock is already owned.
48 *
49 * pthread_spin_init() calls this routine when initialising
50 * a spinlock. If the number of available processors changes
51 * (after a call to SetProcessAffinityMask()) then only
52 * newly initialised spinlocks will notice.
53 */
54 int
55 ptw32_getprocessors (int *count)
56 {
57 DWORD_PTR vProcessCPUs;
58 DWORD_PTR vSystemCPUs;
59 int result = 0;
60
61 #if defined(NEED_PROCESS_AFFINITY_MASK)
62
63 *count = 1;
64
65 #else
66
67 if (GetProcessAffinityMask (GetCurrentProcess (),
68 &vProcessCPUs, &vSystemCPUs))
69 {
70 DWORD_PTR bit;
71 int CPUs = 0;
72
73 for (bit = 1; bit != 0; bit <<= 1)
74 {
75 if (vProcessCPUs & bit)
76 {
77 CPUs++;
78 }
79 }
80 *count = CPUs;
81 }
82 else
83 {
84 result = EAGAIN;
85 }
86
87 #endif
88
89 return (result);
90 }

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