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/* $Id: time-win.cpp $ */
/** @file
* IPRT - Time, Windows.
*/
/*
* Copyright (C) 2006-2010 Oracle Corporation
*
* 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.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP RTLOGGROUP_TIME
#include <Windows.h>
#include <iprt/time.h>
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include "internal/time.h"
/*
* Note! The selected time source be the exact same one as we use in kernel land!
*/
//#define USE_TICK_COUNT
//#define USE_PERFORMANCE_COUNTER
//# define USE_FILE_TIME
//#if defined(RT_ARCH_X86) || defined(RT_ARCH_AMD64)
# define USE_INTERRUPT_TIME
//#else
//# define USE_TICK_COUNT
//#endif
#ifdef USE_INTERRUPT_TIME
typedef struct _MY_KSYSTEM_TIME
{
ULONG LowPart;
LONG High1Time;
LONG High2Time;
} MY_KSYSTEM_TIME;
typedef struct _MY_KUSER_SHARED_DATA
{
ULONG TickCountLowDeprecated;
ULONG TickCountMultiplier;
volatile MY_KSYSTEM_TIME InterruptTime;
/* The rest is not relevant. */
} MY_KUSER_SHARED_DATA, *PMY_KUSER_SHARED_DATA;
#endif /* USE_INTERRUPT_TIME */
DECLINLINE(uint64_t) rtTimeGetSystemNanoTS(void)
{
#if defined USE_TICK_COUNT
/*
* This would work if it didn't flip over every 49 (or so) days.
*/
return (uint64_t)GetTickCount() * (uint64_t)1000000;
#elif defined USE_PERFORMANCE_COUNTER
/*
* Slow and not derived from InterruptTime.
*/
static LARGE_INTEGER llFreq;
static unsigned uMult;
if (!llFreq.QuadPart)
{
if (!QueryPerformanceFrequency(&llFreq))
return (uint64_t)GetTickCount() * (uint64_t)1000000;
llFreq.QuadPart /= 1000;
uMult = 1000000; /* no math genius, but this seemed to help avoiding floating point. */
}
LARGE_INTEGER ll;
if (QueryPerformanceCounter(&ll))
return (ll.QuadPart * uMult) / llFreq.QuadPart;
return (uint64_t)GetTickCount() * (uint64_t)1000000;
#elif defined USE_FILE_TIME
/*
* This is SystemTime not InterruptTime.
*/
uint64_t u64; /* manual say larger integer, should be safe to assume it's the same. */
GetSystemTimeAsFileTime((LPFILETIME)&u64);
return u64 * 100;
#elif defined USE_INTERRUPT_TIME
# if 0 /* ASSUME 0x7ffe0000 is set in stone */
/*
* This is exactly what we want, but we have to obtain it by non-official
* means.
*/
static MY_KUSER_SHARED_DATA *s_pUserSharedData = NULL;
if (!s_pUserSharedData)
{
/** @todo find official way of getting this or some more clever
* detection algorithm if necessary. The com debugger class
* exports this too, windbg knows it too... */
s_pUserSharedData = (PMY_KUSER_SHARED_DATA)(uintptr_t)0x7ffe0000;
}
# endif
PMY_KUSER_SHARED_DATA pUserSharedData = (PMY_KUSER_SHARED_DATA)(uintptr_t)0x7ffe0000;
/* use interrupt time */
LARGE_INTEGER Time;
do
{
Time.HighPart = pUserSharedData->InterruptTime.High1Time;
Time.LowPart = pUserSharedData->InterruptTime.LowPart;
} while (pUserSharedData->InterruptTime.High2Time != Time.HighPart);
return (uint64_t)Time.QuadPart * 100;
#else
# error "Must select a method bright guy!"
#endif
}
RTDECL(uint64_t) RTTimeSystemNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
RTDECL(uint64_t) RTTimeSystemMilliTS(void)
{
return rtTimeGetSystemNanoTS() / 1000000;
}
RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
{
uint64_t u64;
AssertCompile(sizeof(u64) == sizeof(FILETIME));
GetSystemTimeAsFileTime((LPFILETIME)&u64);
return RTTimeSpecSetNtTime(pTime, u64);
}
RTDECL(int) RTTimeSet(PCRTTIMESPEC pTime)
{
FILETIME FileTime;
SYSTEMTIME SysTime;
if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTime, &FileTime), &SysTime))
{
if (SetSystemTime(&SysTime))
return VINF_SUCCESS;
}
return RTErrConvertFromWin32(GetLastError());
}
RTDECL(PRTTIMESPEC) RTTimeLocalNow(PRTTIMESPEC pTime)
{
uint64_t u64;
AssertCompile(sizeof(u64) == sizeof(FILETIME));
GetSystemTimeAsFileTime((LPFILETIME)&u64);
uint64_t u64Local;
if (!FileTimeToLocalFileTime((FILETIME const *)&u64, (LPFILETIME)&u64Local))
u64Local = u64;
return RTTimeSpecSetNtTime(pTime, u64Local);
}
RTDECL(int64_t) RTTimeLocalDeltaNano(void)
{
/*
* UTC = local + Tzi.Bias;
* The bias is given in minutes.
*/
TIME_ZONE_INFORMATION Tzi;
Tzi.Bias = 0;
if (GetTimeZoneInformation(&Tzi) != TIME_ZONE_ID_INVALID)
return -(int64_t)Tzi.Bias * 60*1000*1000*1000;
return 0;
}
RTDECL(PRTTIME) RTTimeLocalExplode(PRTTIME pTime, PCRTTIMESPEC pTimeSpec)
{
/*
* FileTimeToLocalFileTime does not do the right thing, so we'll have
* to convert to system time and SystemTimeToTzSpecificLocalTime instead.
*/
RTTIMESPEC LocalTime;
SYSTEMTIME SystemTimeIn;
FILETIME FileTime;
if (FileTimeToSystemTime(RTTimeSpecGetNtFileTime(pTimeSpec, &FileTime), &SystemTimeIn))
{
SYSTEMTIME SystemTimeOut;
if (SystemTimeToTzSpecificLocalTime(NULL /* use current TZI */,
&SystemTimeIn,
&SystemTimeOut))
{
if (SystemTimeToFileTime(&SystemTimeOut, &FileTime))
{
RTTimeSpecSetNtFileTime(&LocalTime, &FileTime);
pTime = RTTimeExplode(pTime, &LocalTime);
if (pTime)
pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
return pTime;
}
}
}
/*
* The fallback is to use the current offset.
* (A better fallback would be to use the offset of the same time of the year.)
*/
LocalTime = *pTimeSpec;
RTTimeSpecAddNano(&LocalTime, RTTimeLocalDeltaNano());
pTime = RTTimeExplode(pTime, &LocalTime);
if (pTime)
pTime->fFlags = (pTime->fFlags & ~RTTIME_FLAGS_TYPE_MASK) | RTTIME_FLAGS_TYPE_LOCAL;
return pTime;
}
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