| 1 | /* $Id: time-darwin.cpp 4750 2007-09-13 07:05:03Z vboxsync $ */
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| 2 | /** @file
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| 3 | * innotek Portable Runtime - Time, Darwin.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2006-2007 innotek GmbH
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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 as published by the Free Software Foundation,
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| 13 | * in version 2 as it comes in the "COPYING" file of the VirtualBox OSE
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| 14 | * distribution. VirtualBox OSE is distributed in the hope that it will
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| 15 | * be useful, but WITHOUT ANY WARRANTY of any kind.
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| 16 | */
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| 17 |
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| 18 |
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| 19 | /*******************************************************************************
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| 20 | * Header Files *
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| 21 | *******************************************************************************/
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| 22 | #define LOG_GROUP RTLOGGROUP_TIME
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| 23 | #define RTTIME_INCL_TIMEVAL
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| 24 | #include <mach/mach_time.h>
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| 25 | #include <mach/kern_return.h>
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| 26 | #include <sys/time.h>
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| 27 | #include <time.h>
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| 28 |
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| 29 | #include <iprt/time.h>
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| 30 | #include "internal/time.h"
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| 31 |
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| 32 |
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| 33 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
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| 34 | {
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| 35 | static struct mach_timebase_info s_Info = { 0, 0 };
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| 36 | static double s_rdFactor = 0.0;
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| 37 |
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| 38 | /* get the factors the first time (pray we're not racing anyone) */
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| 39 | if (s_Info.denom == 0)
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| 40 | {
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| 41 | static bool s_fFailedToGetTimeBaseInfo = false;
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| 42 | if (!s_fFailedToGetTimeBaseInfo)
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| 43 | {
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| 44 | struct mach_timebase_info Info;
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| 45 | if (mach_timebase_info(&Info) != KERN_SUCCESS)
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| 46 | {
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| 47 | s_rdFactor = (double)Info.numer / (double)Info.denom;
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| 48 | s_Info = Info;
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| 49 | }
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| 50 | else
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| 51 | {
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| 52 | s_Info.denom = s_Info.numer = 0;
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| 53 | s_fFailedToGetTimeBaseInfo = true;
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| 54 | }
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| 55 | }
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| 56 | }
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| 57 |
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| 58 | /* special case: absolute time is in nanoseconds */
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| 59 | if (s_Info.denom == 1 && s_Info.numer == 1)
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| 60 | return mach_absolute_time();
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| 61 |
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| 62 | /* general case: multiply by factor to get nanoseconds. */
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| 63 | if (s_rdFactor != 0.0)
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| 64 | return mach_absolute_time() * s_rdFactor;
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| 65 |
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| 66 | /* worst case: fallback to gettimeofday(). */
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| 67 | struct timeval tv;
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| 68 | gettimeofday(&tv, NULL);
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| 69 | return (uint64_t)tv.tv_sec * (uint64_t)(1000 * 1000 * 1000)
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| 70 | + (uint64_t)(tv.tv_usec * 1000);
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| 71 | }
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| 72 |
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| 73 |
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| 74 | /**
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| 75 | * Gets the current nanosecond timestamp.
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| 76 | *
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| 77 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
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| 78 | * resolution or performance optimizations.
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| 79 | *
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| 80 | * @returns nanosecond timestamp.
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| 81 | */
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| 82 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
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| 83 | {
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| 84 | return rtTimeGetSystemNanoTS();
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| 85 | }
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| 86 |
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| 87 |
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| 88 | /**
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| 89 | * Gets the current millisecond timestamp.
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| 90 | *
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| 91 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
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| 92 | * resolution or performance optimizations.
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| 93 | *
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| 94 | * @returns millisecond timestamp.
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| 95 | */
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| 96 | RTDECL(uint64_t) RTTimeSystemMilliTS(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 | /**
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| 103 | * Gets the current system time.
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| 104 | *
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| 105 | * @returns pTime.
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| 106 | * @param pTime Where to store the time.
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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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