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/* $Id: time-win.cpp $ */
/** @file
* IPRT - Time, Windows.
*/
/*
* Copyright (C) 2006-2019 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 <iprt/nt/nt-and-windows.h>
#include <iprt/time.h>
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/errcore.h>
#include "internal/time.h"
#include "internal-r3-win.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
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() * RT_NS_1MS_64;
#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() * RT_NS_1MS_64;
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() * RT_NS_1MS_64;
#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
/*
* Use interrupt time if we can (not possible on NT 3.1).
* Note! We cannot entirely depend on g_enmWinVer here as we're likely to
* get called before IPRT is initialized. Ditto g_hModNtDll.
*/
static PFNRTLGETINTERRUPTTIMEPRECISE s_pfnRtlGetInterruptTimePrecise = NULL;
static int volatile s_iCanUseUserSharedData = -1;
int iCanUseUserSharedData = s_iCanUseUserSharedData;
if (iCanUseUserSharedData != -1)
{ /* likely */ }
else
{
/* We may be called before g_enmWinVer has been initialized. */
if (g_enmWinVer != kRTWinOSType_UNKNOWN)
iCanUseUserSharedData = g_enmWinVer > kRTWinOSType_NT310;
else
{
DWORD dwVer = GetVersion();
iCanUseUserSharedData = (dwVer & 0xff) != 3 || ((dwVer >> 8) & 0xff) >= 50;
}
if (iCanUseUserSharedData != 0)
{
FARPROC pfn = GetProcAddress(g_hModNtDll ? g_hModNtDll : GetModuleHandleW(L"ntdll"), "RtlGetInterruptTimePrecise");
if (pfn != NULL)
{
ASMAtomicWritePtr(&s_pfnRtlGetInterruptTimePrecise, pfn);
iCanUseUserSharedData = 42;
}
}
s_iCanUseUserSharedData = iCanUseUserSharedData;
}
if (iCanUseUserSharedData != 0)
{
LARGE_INTEGER Time;
if (iCanUseUserSharedData == 42)
{
uint64_t iIgnored;
Time.QuadPart = s_pfnRtlGetInterruptTimePrecise(&iIgnored);
}
else
{
PKUSER_SHARED_DATA pUserSharedData = (PKUSER_SHARED_DATA)MM_SHARED_USER_DATA_VA;
do
{
Time.HighPart = pUserSharedData->InterruptTime.High1Time;
Time.LowPart = pUserSharedData->InterruptTime.LowPart;
} while (pUserSharedData->InterruptTime.High2Time != Time.HighPart);
}
return (uint64_t)Time.QuadPart * 100;
}
return (uint64_t)GetTickCount() * RT_NS_1MS_64;
#else
# error "Must select a method bright guy!"
#endif
}
RTDECL(uint64_t) RTTimeSystemNanoTS(void)
{
return rtTimeGetSystemNanoTS();
}
RTDECL(uint64_t) RTTimeSystemMilliTS(void)
{
return rtTimeGetSystemNanoTS() / RT_NS_1MS;
}
RTDECL(PRTTIMESPEC) RTTimeNow(PRTTIMESPEC pTime)
{
uint64_t u64;
AssertCompile(sizeof(u64) == sizeof(FILETIME));
GetSystemTimeAsFileTime((LPFILETIME)&u64);
return RTTimeSpecSetNtTime(pTime, u64);
}
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 * RT_NS_1SEC_64;
return 0;
}
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