| 1 | /* $Id: time-darwin.cpp 15870 2009-01-08 15:08:24Z vboxsync $ */
|
|---|
| 2 | /** @file
|
|---|
| 3 | * IPRT - Time, Darwin.
|
|---|
| 4 | */
|
|---|
| 5 |
|
|---|
| 6 | /*
|
|---|
| 7 | * Copyright (C) 2006-2007 Sun Microsystems, Inc.
|
|---|
| 8 | *
|
|---|
| 9 | * This file is part of VirtualBox Open Source Edition (OSE), as
|
|---|
| 10 | * available from http://www.virtualbox.org. This file is free software;
|
|---|
| 11 | * you can redistribute it and/or modify it under the terms of the GNU
|
|---|
| 12 | * General Public License (GPL) as published by the Free Software
|
|---|
| 13 | * Foundation, in version 2 as it comes in the "COPYING" file of the
|
|---|
| 14 | * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
|
|---|
| 15 | * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
|
|---|
| 16 | *
|
|---|
| 17 | * The contents of this file may alternatively be used under the terms
|
|---|
| 18 | * of the Common Development and Distribution License Version 1.0
|
|---|
| 19 | * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
|
|---|
| 20 | * VirtualBox OSE distribution, in which case the provisions of the
|
|---|
| 21 | * CDDL are applicable instead of those of the GPL.
|
|---|
| 22 | *
|
|---|
| 23 | * You may elect to license modified versions of this file under the
|
|---|
| 24 | * terms and conditions of either the GPL or the CDDL or both.
|
|---|
| 25 | *
|
|---|
| 26 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
|
|---|
| 27 | * Clara, CA 95054 USA or visit http://www.sun.com if you need
|
|---|
| 28 | * additional information or have any questions.
|
|---|
| 29 | */
|
|---|
| 30 |
|
|---|
| 31 |
|
|---|
| 32 | /*******************************************************************************
|
|---|
| 33 | * Header Files *
|
|---|
| 34 | *******************************************************************************/
|
|---|
| 35 | #define LOG_GROUP RTLOGGROUP_TIME
|
|---|
| 36 | #define RTTIME_INCL_TIMEVAL
|
|---|
| 37 | #include <mach/mach_time.h>
|
|---|
| 38 | #include <mach/kern_return.h>
|
|---|
| 39 | #include <sys/time.h>
|
|---|
| 40 | #include <time.h>
|
|---|
| 41 |
|
|---|
| 42 | #include <iprt/time.h>
|
|---|
| 43 | #include <iprt/assert.h>
|
|---|
| 44 | #include "internal/time.h"
|
|---|
| 45 |
|
|---|
| 46 |
|
|---|
| 47 | /*******************************************************************************
|
|---|
| 48 | * Global Variables *
|
|---|
| 49 | *******************************************************************************/
|
|---|
| 50 | static struct mach_timebase_info g_Info = { 0, 0 };
|
|---|
| 51 | static double g_rdFactor = 0.0;
|
|---|
| 52 | static bool g_fFailedToGetTimeBaseInfo = false;
|
|---|
| 53 |
|
|---|
| 54 |
|
|---|
| 55 | /**
|
|---|
| 56 | * Perform lazy init (pray we're not racing anyone in a bad way).
|
|---|
| 57 | */
|
|---|
| 58 | static void rtTimeDarwinLazyInit(void)
|
|---|
| 59 | {
|
|---|
| 60 | struct mach_timebase_info Info;
|
|---|
| 61 | if (mach_timebase_info(&Info) == KERN_SUCCESS)
|
|---|
| 62 | {
|
|---|
| 63 | g_rdFactor = (double)Info.numer / (double)Info.denom;
|
|---|
| 64 | g_Info = Info;
|
|---|
| 65 | }
|
|---|
| 66 | else
|
|---|
| 67 | {
|
|---|
| 68 | g_fFailedToGetTimeBaseInfo = true;
|
|---|
| 69 | Assert(g_Info.denom == 0 && g_Info.numer == 0 && g_rdFactor == 0.0);
|
|---|
| 70 | }
|
|---|
| 71 | }
|
|---|
| 72 |
|
|---|
| 73 |
|
|---|
| 74 | /**
|
|---|
| 75 | * Internal worker.
|
|---|
| 76 | * @returns Nanosecond timestamp.
|
|---|
| 77 | */
|
|---|
| 78 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
|
|---|
| 79 | {
|
|---|
| 80 | /* Lazy init. */
|
|---|
| 81 | if (RT_UNLIKELY(g_Info.denom == 0 && !g_fFailedToGetTimeBaseInfo))
|
|---|
| 82 | rtTimeDarwinLazyInit();
|
|---|
| 83 |
|
|---|
| 84 | /* special case: absolute time is in nanoseconds */
|
|---|
| 85 | if (g_Info.denom == 1 && g_Info.numer == 1)
|
|---|
| 86 | return mach_absolute_time();
|
|---|
| 87 |
|
|---|
| 88 | /* general case: multiply by factor to get nanoseconds. */
|
|---|
| 89 | if (g_rdFactor != 0.0)
|
|---|
| 90 | return mach_absolute_time() * g_rdFactor;
|
|---|
| 91 |
|
|---|
| 92 | /* worst case: fallback to gettimeofday(). */
|
|---|
| 93 | struct timeval tv;
|
|---|
| 94 | gettimeofday(&tv, NULL);
|
|---|
| 95 | return (uint64_t)tv.tv_sec * (uint64_t)(1000 * 1000 * 1000)
|
|---|
| 96 | + (uint64_t)(tv.tv_usec * 1000);
|
|---|
| 97 | }
|
|---|
| 98 |
|
|---|
| 99 |
|
|---|
| 100 | /**
|
|---|
| 101 | * Gets the current nanosecond timestamp.
|
|---|
| 102 | *
|
|---|
| 103 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
|
|---|
| 104 | * resolution or performance optimizations.
|
|---|
| 105 | *
|
|---|
| 106 | * @returns nanosecond timestamp.
|
|---|
| 107 | */
|
|---|
| 108 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
|
|---|
| 109 | {
|
|---|
| 110 | return rtTimeGetSystemNanoTS();
|
|---|
| 111 | }
|
|---|
| 112 |
|
|---|
| 113 |
|
|---|
| 114 | /**
|
|---|
| 115 | * Gets the current millisecond timestamp.
|
|---|
| 116 | *
|
|---|
| 117 | * This differs from RTTimeNanoTS in that it will use system APIs and not do any
|
|---|
| 118 | * resolution or performance optimizations.
|
|---|
| 119 | *
|
|---|
| 120 | * @returns millisecond timestamp.
|
|---|
| 121 | */
|
|---|
| 122 | RTDECL(uint64_t) RTTimeSystemMilliTS(void)
|
|---|
| 123 | {
|
|---|
| 124 | return rtTimeGetSystemNanoTS();
|
|---|
| 125 | }
|
|---|
| 126 |
|
|---|
| 127 |
|
|---|
| 128 | /**
|
|---|
| 129 | * Gets the current system time.
|
|---|
| 130 | *
|
|---|
| 131 | * @returns pTime.
|
|---|
| 132 | * @param pTime Where to store the time.
|
|---|
| 133 | */
|
|---|
| 134 | RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
|
|---|
| 135 | {
|
|---|
| 136 | /** @todo find nanosecond API for getting time of day. */
|
|---|
| 137 | struct timeval tv;
|
|---|
| 138 | gettimeofday(&tv, NULL);
|
|---|
| 139 | return RTTimeSpecSetTimeval(pTime, &tv);
|
|---|
| 140 | }
|
|---|
| 141 |
|
|---|
