1 | /* $Id: system-posix.cpp 8245 2008-04-21 17:24:28Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - System, POSIX.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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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 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
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27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
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28 | * additional information or have any questions.
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29 | */
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30 |
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31 |
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32 | /*******************************************************************************
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33 | * Header Files *
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34 | *******************************************************************************/
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35 | #include <iprt/system.h>
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36 | #include <iprt/assert.h>
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37 |
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38 | #include <unistd.h>
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39 | #if !defined(RT_OS_SOLARIS)
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40 | # include <sys/sysctl.h>
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41 | #endif
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42 |
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43 |
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44 | /**
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45 | * Gets the number of logical (not physical) processors in the system.
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46 | *
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47 | * @returns Number of logical processors in the system.
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48 | */
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49 | RTR3DECL(unsigned) RTSystemProcessorGetCount(void)
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50 | {
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51 | int cCpus; NOREF(cCpus);
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52 |
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53 | /*
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54 | * The sysconf way (linux and others).
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55 | */
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56 | #ifdef _SC_NPROCESSORS_ONLN
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57 | cCpus = sysconf(_SC_NPROCESSORS_ONLN);
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58 | if (cCpus >= 1)
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59 | return cCpus;
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60 | #endif
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61 |
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62 | /*
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63 | * The BSD 4.4 way.
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64 | */
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65 | #if defined(CTL_HW) && defined(HW_NCPU)
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66 | int aiMib[2];
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67 | aiMib[0] = CTL_HW;
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68 | aiMib[1] = HW_NCPU;
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69 | cCpus = -1;
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70 | size_t cb = sizeof(cCpus);
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71 | int rc = sysctl(aiMib, ELEMENTS(aiMib), &cCpus, &cb, NULL, 0);
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72 | if (rc != -1 && cCpus >= 1)
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73 | return cCpus;
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74 | #endif
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75 | return 1;
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76 | }
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77 |
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78 |
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79 | /**
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80 | * Gets the active logical processor mask.
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81 | *
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82 | * @returns Active logical processor mask. (bit 0 == logical cpu 0)
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83 | */
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84 | RTR3DECL(uint64_t) RTSystemProcessorGetActiveMask(void)
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85 | {
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86 | int cCpus = RTSystemProcessorGetCount();
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87 | return ((uint64_t)1 << cCpus) - 1;
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88 | }
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89 |
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