| 1 | /* $Id: time-darwin.cpp 104105 2024-03-28 13:33:58Z 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) 2006-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #define LOG_GROUP RTLOGGROUP_TIME
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| 42 | #define RTTIME_INCL_TIMEVAL
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| 43 | #include <mach/mach_time.h>
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| 44 | #include <mach/kern_return.h>
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| 45 | #include <sys/time.h>
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| 46 | #include <time.h>
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| 47 |
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| 48 | #include <iprt/time.h>
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| 49 | #include <iprt/assert.h>
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| 50 | #include <iprt/asm-math.h>
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| 51 | #include "internal/time.h"
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| 52 |
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| 53 |
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| 54 | /*********************************************************************************************************************************
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| 55 | * Global Variables *
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| 56 | *********************************************************************************************************************************/
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| 57 | static struct mach_timebase_info g_Info = { 0, 0 };
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| 58 | static bool g_fFailedToGetTimeBaseInfo = false;
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| 59 |
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| 60 |
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| 61 | /**
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| 62 | * Perform lazy init (pray we're not racing anyone in a bad way).
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| 63 | */
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| 64 | static void rtTimeDarwinLazyInit(void)
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| 65 | {
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| 66 | struct mach_timebase_info Info;
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| 67 | if (mach_timebase_info(&Info) == KERN_SUCCESS)
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| 68 | g_Info = Info;
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| 69 | else
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| 70 | {
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| 71 | g_fFailedToGetTimeBaseInfo = true;
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| 72 | Assert(g_Info.denom == 0 && g_Info.numer == 0);
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| 73 | }
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| 74 | }
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| 75 |
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| 76 |
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| 77 | /**
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| 78 | * Internal worker.
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| 79 | * @returns Nanosecond timestamp.
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| 80 | */
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| 81 | DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
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| 82 | {
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| 83 | /* Lazy init. */
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| 84 | if (RT_UNLIKELY(g_Info.denom == 0 && !g_fFailedToGetTimeBaseInfo))
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| 85 | rtTimeDarwinLazyInit();
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| 86 |
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| 87 | /* special case: absolute time is in nanoseconds. */
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| 88 | if (g_Info.denom == 1 && g_Info.numer == 1)
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| 89 | return mach_absolute_time();
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| 90 |
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| 91 | /* general case: multiply by factor to get nanoseconds. */
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| 92 | if (g_Info.denom > 0 && g_Info.numer > 0)
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| 93 | {
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| 94 | /*
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| 95 | * We could use clock_gettime_nsec_np(CLOCK_UPTIME_RAW) but internally
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| 96 | * it might be calling mach_timebase_info() for each call. This is most
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| 97 | * likely faster since we avoid calling mach_timebase_info() here.
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| 98 | */
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| 99 | uint64_t const cTicks = mach_absolute_time();
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| 100 | return ASMMultU64ByU32DivByU32(cTicks, g_Info.numer, g_Info.denom);
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| 101 | }
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| 102 |
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| 103 | /* worst case: fallback to gettimeofday(). */
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| 104 | struct timeval tv;
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| 105 | gettimeofday(&tv, NULL);
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| 106 | return (uint64_t)tv.tv_sec * RT_NS_1SEC_64
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| 107 | + (uint64_t)(tv.tv_usec * RT_NS_1US);
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| 108 | }
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| 109 |
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| 110 |
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| 111 | RTDECL(uint64_t) RTTimeSystemNanoTS(void)
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| 112 | {
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| 113 | return rtTimeGetSystemNanoTS();
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| 114 | }
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| 115 |
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| 116 |
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| 117 | RTDECL(uint64_t) RTTimeSystemMilliTS(void)
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| 118 | {
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| 119 | return rtTimeGetSystemNanoTS() / RT_NS_1MS;
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| 120 | }
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| 121 |
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| 122 |
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| 123 | RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
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| 124 | {
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| 125 | /** @todo find nanosecond API for getting time of day. */
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| 126 | struct timeval tv;
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| 127 | gettimeofday(&tv, NULL);
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| 128 | return RTTimeSpecSetTimeval(pTime, &tv);
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| 129 | }
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| 130 |
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