1 | /* $Id: time-darwin.cpp 76553 2019-01-01 01:45:53Z vboxsync $ */
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2 | /** @file
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3 | * IPRT - Time, Darwin.
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4 | */
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5 |
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6 | /*
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7 | * Copyright (C) 2006-2019 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 | #define LOG_GROUP RTLOGGROUP_TIME
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32 | #define RTTIME_INCL_TIMEVAL
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33 | #include <mach/mach_time.h>
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34 | #include <mach/kern_return.h>
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35 | #include <sys/time.h>
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36 | #include <time.h>
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37 |
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38 | #include <iprt/time.h>
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39 | #include <iprt/assert.h>
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40 | #include "internal/time.h"
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41 |
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42 |
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43 | /*********************************************************************************************************************************
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44 | * Global Variables *
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45 | *********************************************************************************************************************************/
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46 | static struct mach_timebase_info g_Info = { 0, 0 };
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47 | static double g_rdFactor = 0.0;
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48 | static bool g_fFailedToGetTimeBaseInfo = false;
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49 |
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50 |
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51 | /**
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52 | * Perform lazy init (pray we're not racing anyone in a bad way).
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53 | */
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54 | static void rtTimeDarwinLazyInit(void)
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55 | {
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56 | struct mach_timebase_info Info;
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57 | if (mach_timebase_info(&Info) == KERN_SUCCESS)
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58 | {
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59 | g_rdFactor = (double)Info.numer / (double)Info.denom;
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60 | g_Info = Info;
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61 | }
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62 | else
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63 | {
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64 | g_fFailedToGetTimeBaseInfo = true;
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65 | Assert(g_Info.denom == 0 && g_Info.numer == 0 && g_rdFactor == 0.0);
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66 | }
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67 | }
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68 |
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69 |
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70 | /**
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71 | * Internal worker.
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72 | * @returns Nanosecond timestamp.
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73 | */
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74 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
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75 | {
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76 | /* Lazy init. */
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77 | if (RT_UNLIKELY(g_Info.denom == 0 && !g_fFailedToGetTimeBaseInfo))
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78 | rtTimeDarwinLazyInit();
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79 |
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80 | /* special case: absolute time is in nanoseconds */
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81 | if (g_Info.denom == 1 && g_Info.numer == 1)
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82 | return mach_absolute_time();
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83 |
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84 | /* general case: multiply by factor to get nanoseconds. */
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85 | if (g_rdFactor != 0.0)
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86 | return mach_absolute_time() * g_rdFactor;
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87 |
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88 | /* worst case: fallback to gettimeofday(). */
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89 | struct timeval tv;
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90 | gettimeofday(&tv, NULL);
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91 | return (uint64_t)tv.tv_sec * RT_NS_1SEC_64
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92 | + (uint64_t)(tv.tv_usec * RT_NS_1US);
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93 | }
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94 |
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95 |
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96 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
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97 | {
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98 | return rtTimeGetSystemNanoTS();
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99 | }
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100 |
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101 |
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102 | RTDECL(uint64_t) RTTimeSystemMilliTS(void)
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103 | {
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104 | return rtTimeGetSystemNanoTS() / RT_NS_1MS;
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105 | }
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106 |
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107 |
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108 | RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
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109 | {
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110 | /** @todo find nanosecond API for getting time of day. */
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111 | struct timeval tv;
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112 | gettimeofday(&tv, NULL);
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113 | return RTTimeSpecSetTimeval(pTime, &tv);
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114 | }
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115 |
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