VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/posix/RTMpGetCount-posix.cpp@ 103914

Last change on this file since 103914 was 98103, checked in by vboxsync, 23 months ago

Copyright year updates by scm.

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1/* $Id: RTMpGetCount-posix.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - RTMpGetCount, POSIX.
4 */
5
6/*
7 * Copyright (C) 2006-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include <iprt/mp.h>
42#include <iprt/assert.h>
43
44#include <unistd.h>
45#if !defined(RT_OS_SOLARIS)
46# include <sys/sysctl.h>
47#endif
48
49
50RTDECL(RTCPUID) RTMpGetCount(void)
51{
52 /*
53 * The sysconf way (linux and others).
54 */
55#if defined(_SC_NPROCESSORS_MAX) || defined(_SC_NPROCESSORS_CONF) || defined(_SC_NPROCESSORS_ONLN)
56 int cCpusSC = -1;
57# ifdef _SC_NPROCESSORS_MAX
58 int cMax = sysconf(_SC_NPROCESSORS_MAX);
59 cCpusSC = RT_MAX(cCpusSC, cMax);
60# endif
61# ifdef _SC_NPROCESSORS_CONF
62 int cConf = sysconf(_SC_NPROCESSORS_CONF);
63 cCpusSC = RT_MAX(cCpusSC, cConf);
64# endif
65# ifdef _SC_NPROCESSORS_ONLN
66 int cOnln = sysconf(_SC_NPROCESSORS_ONLN);
67 cCpusSC = RT_MAX(cCpusSC, cOnln);
68# endif
69 Assert(cCpusSC > 0);
70 if (cCpusSC > 0)
71 return cCpusSC;
72#endif
73
74 /*
75 * The BSD 4.4 way.
76 */
77#if defined(CTL_HW) && defined(HW_NCPU)
78 int aiMib[2];
79 aiMib[0] = CTL_HW;
80 aiMib[1] = HW_NCPU;
81 int cCpus = -1;
82 size_t cb = sizeof(cCpus);
83 int rc = sysctl(aiMib, RT_ELEMENTS(aiMib), &cCpus, &cb, NULL, 0);
84 if (rc != -1 && cCpus >= 1)
85 return cCpus;
86#endif
87 return 1;
88}
89
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