48 lines
1.7 KiB
C++
48 lines
1.7 KiB
C++
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//--------------------------------------------------------------------
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// AccurateSysCalls - implementation
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// Copyright (C) Microsoft Corporation, 1999
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//
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// Created by: Louis Thomas (louisth), 9-24-99
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//
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// More accurate time functions calling the NT api directly
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//
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#include <nt.h>
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//--------------------------------------------------------------------
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void __fastcall AccurateGetSystemTime(unsigned __int64 * pqwTime) {
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NtQuerySystemTime((LARGE_INTEGER *)pqwTime);
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}
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//--------------------------------------------------------------------
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void __fastcall AccurateSetSystemTime(unsigned __int64 * pqwTime) {
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NtSetSystemTime((LARGE_INTEGER *)pqwTime, NULL);
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}
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//--------------------------------------------------------------------
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void __fastcall AccurateGetTickCount(unsigned __int64 * pqwTick) {
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// HACKHACK: this is not thread safe and assumes that it will
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// always be called more often than every 47 days
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static unsigned __int32 dwLastTickCount=0;
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static unsigned __int32 dwHighTickCount=0;
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if (USER_SHARED_DATA->TickCountLow<dwLastTickCount) {
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dwHighTickCount++;
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}
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dwLastTickCount=USER_SHARED_DATA->TickCountLow;
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*pqwTick=USER_SHARED_DATA->TickCountLow+(((unsigned __int64)dwHighTickCount)<<32);
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};
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//--------------------------------------------------------------------
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unsigned __int32 SetTimeSlipEvent(HANDLE hTimeSlipEvent) {
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return NtSetSystemInformation(SystemTimeSlipNotification, &hTimeSlipEvent, sizeof(HANDLE));
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}
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//--------------------------------------------------------------------
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void GetSysExpirationDate(unsigned __int64 * pqwTime) {
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*(LARGE_INTEGER *)pqwTime=USER_SHARED_DATA->SystemExpirationDate;
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}
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