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/* $Id: time-darwin.cpp 15870 2009-01-08 15:08:24Z vboxsync $ */
/** @file
* IPRT - Time, Darwin.
*/
/*
* Copyright (C) 2006-2007 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#define RTTIME_INCL_TIMEVAL
#include <mach/mach_time.h>
#include <mach/kern_return.h>
#include <sys/time.h>
#include <time.h>
#include <iprt/time.h>
#include <iprt/assert.h>
#include "internal/time.h"
/*******************************************************************************
* Global Variables *
*******************************************************************************/
static struct mach_timebase_info g_Info = { 0, 0 };
static double g_rdFactor = 0.0;
static bool g_fFailedToGetTimeBaseInfo = false;
/**
* Perform lazy init (pray we're not racing anyone in a bad way).
*/
static void rtTimeDarwinLazyInit(void)
{
struct mach_timebase_info Info;
if (mach_timebase_info(&Info) == KERN_SUCCESS)
{
g_rdFactor = (double)Info.numer / (double)Info.denom;
g_Info = Info;
}
else
{
g_fFailedToGetTimeBaseInfo = true;
Assert(g_Info.denom == 0 && g_Info.numer == 0 && g_rdFactor == 0.0);
}
}
/**
* Internal worker.
* @returns Nanosecond timestamp.
*/
DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
{
/* Lazy init. */
if (RT_UNLIKELY(g_Info.denom == 0 && !g_fFailedToGetTimeBaseInfo))
rtTimeDarwinLazyInit();
/* special case: absolute time is in nanoseconds */
if (g_Info.denom == 1 && g_Info.numer == 1)
return mach_absolute_time();
/* general case: multiply by factor to get nanoseconds. */
if (g_rdFactor != 0.0)
return mach_absolute_time() * g_rdFactor;
/* worst case: fallback to gettimeofday(). */
struct timeval tv;
gettimeofday(&tv, NULL);
return (uint64_t)tv.tv_sec * (uint64_t)(1000 * 1000 * 1000)
+ (uint64_t)(tv.tv_usec * 1000);
}
/**
* Gets the current nanosecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns nanosecond timestamp.
*/
RTDECL(uint64_t) RTTimeSystemNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
/**
* Gets the current millisecond timestamp.
*
* This differs from RTTimeNanoTS in that it will use system APIs and not do any
* resolution or performance optimizations.
*
* @returns millisecond timestamp.
*/
RTDECL(uint64_t) RTTimeSystemMilliTS(void)
{
return rtTimeGetSystemNanoTS();
}
/**
* Gets the current system time.
*
* @returns pTime.
* @param pTime Where to store the time.
*/
RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
{
/** @todo find nanosecond API for getting time of day. */
struct timeval tv;
gettimeofday(&tv, NULL);
return RTTimeSpecSetTimeval(pTime, &tv);
}
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