| 1 | /* $Id: RTMpGetCount-posix.cpp 93115 2022-01-01 11:31:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * IPRT - RTMpGetCount, POSIX.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2022 Oracle Corporation
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| 8 | *
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| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
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| 10 | * available from http://www.virtualbox.org. This file is free software;
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| 11 | * you can redistribute it and/or modify it under the terms of the GNU
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| 12 | * General Public License (GPL) as published by the Free Software
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| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
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| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
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| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | *
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| 17 | * The contents of this file may alternatively be used under the terms
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| 18 | * of the Common Development and Distribution License Version 1.0
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| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
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| 20 | * VirtualBox OSE distribution, in which case the provisions of the
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| 21 | * CDDL are applicable instead of those of the GPL.
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| 22 | *
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| 23 | * You may elect to license modified versions of this file under the
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| 24 | * terms and conditions of either the GPL or the CDDL or both.
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| 25 | */
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| 26 |
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| 27 |
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| 28 | /*********************************************************************************************************************************
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| 29 | * Header Files *
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| 30 | *********************************************************************************************************************************/
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| 31 | #include <iprt/mp.h>
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| 32 | #include <iprt/assert.h>
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| 33 |
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| 34 | #include <unistd.h>
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| 35 | #if !defined(RT_OS_SOLARIS)
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| 36 | # include <sys/sysctl.h>
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| 37 | #endif
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| 38 |
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| 39 |
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| 40 | RTDECL(RTCPUID) RTMpGetCount(void)
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| 41 | {
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| 42 | /*
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| 43 | * The sysconf way (linux and others).
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| 44 | */
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| 45 | #if defined(_SC_NPROCESSORS_MAX) || defined(_SC_NPROCESSORS_CONF) || defined(_SC_NPROCESSORS_ONLN)
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| 46 | int cCpusSC = -1;
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| 47 | # ifdef _SC_NPROCESSORS_MAX
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| 48 | int cMax = sysconf(_SC_NPROCESSORS_MAX);
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| 49 | cCpusSC = RT_MAX(cCpusSC, cMax);
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| 50 | # endif
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| 51 | # ifdef _SC_NPROCESSORS_CONF
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| 52 | int cConf = sysconf(_SC_NPROCESSORS_CONF);
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| 53 | cCpusSC = RT_MAX(cCpusSC, cConf);
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| 54 | # endif
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| 55 | # ifdef _SC_NPROCESSORS_ONLN
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| 56 | int cOnln = sysconf(_SC_NPROCESSORS_ONLN);
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| 57 | cCpusSC = RT_MAX(cCpusSC, cOnln);
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| 58 | # endif
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| 59 | Assert(cCpusSC > 0);
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| 60 | if (cCpusSC > 0)
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| 61 | return cCpusSC;
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| 62 | #endif
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| 63 |
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| 64 | /*
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| 65 | * The BSD 4.4 way.
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| 66 | */
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| 67 | #if defined(CTL_HW) && defined(HW_NCPU)
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| 68 | int aiMib[2];
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| 69 | aiMib[0] = CTL_HW;
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| 70 | aiMib[1] = HW_NCPU;
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| 71 | int cCpus = -1;
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| 72 | size_t cb = sizeof(cCpus);
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| 73 | int rc = sysctl(aiMib, RT_ELEMENTS(aiMib), &cCpus, &cb, NULL, 0);
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| 74 | if (rc != -1 && cCpus >= 1)
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| 75 | return cCpus;
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| 76 | #endif
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| 77 | return 1;
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| 78 | }
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| 79 |
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