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/* $Id: RTMpGetCount-posix.cpp $ */
/** @file
* IPRT - RTMpGetCount, POSIX.
*/
/*
* Copyright (C) 2006-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* 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, in version 3 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, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <iprt/mp.h>
#include <iprt/assert.h>
#include <unistd.h>
#if !defined(RT_OS_SOLARIS)
# include <sys/sysctl.h>
#endif
RTDECL(RTCPUID) RTMpGetCount(void)
{
/*
* The sysconf way (linux and others).
*/
#if defined(_SC_NPROCESSORS_MAX) || defined(_SC_NPROCESSORS_CONF) || defined(_SC_NPROCESSORS_ONLN)
int cCpusSC = -1;
# ifdef _SC_NPROCESSORS_MAX
int cMax = sysconf(_SC_NPROCESSORS_MAX);
cCpusSC = RT_MAX(cCpusSC, cMax);
# endif
# ifdef _SC_NPROCESSORS_CONF
int cConf = sysconf(_SC_NPROCESSORS_CONF);
cCpusSC = RT_MAX(cCpusSC, cConf);
# endif
# ifdef _SC_NPROCESSORS_ONLN
int cOnln = sysconf(_SC_NPROCESSORS_ONLN);
cCpusSC = RT_MAX(cCpusSC, cOnln);
# endif
Assert(cCpusSC > 0);
if (cCpusSC > 0)
return cCpusSC;
#endif
/*
* The BSD 4.4 way.
*/
#if defined(CTL_HW) && defined(HW_NCPU)
int aiMib[2];
aiMib[0] = CTL_HW;
aiMib[1] = HW_NCPU;
int cCpus = -1;
size_t cb = sizeof(cCpus);
int rc = sysctl(aiMib, RT_ELEMENTS(aiMib), &cCpus, &cb, NULL, 0);
if (rc != -1 && cCpus >= 1)
return cCpus;
#endif
return 1;
}
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