/* $Id: RTMpGetCount-posix.cpp $ */ /** @file * IPRT - RTMpGetCount, POSIX. */ /* * Copyright (C) 2006-2019 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE 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. */ /********************************************************************************************************************************* * 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; }