| 1 | #define _CRT_SECURE_NO_WARNINGS
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| 2 | #define WIN32_LEAN_AND_MEAN
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| 3 | #include <windows.h>
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| 4 | #include <malloc.h>
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| 5 | #include <stdio.h>
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| 6 | #include <stdlib.h>
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| 7 | #include <stddef.h>
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| 8 |
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| 9 |
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| 10 | typedef unsigned __int8 UI8;
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| 11 | typedef signed __int8 SI8;
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| 12 | typedef unsigned __int16 UI16;
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| 13 | typedef signed __int16 SI16;
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| 14 | typedef unsigned __int32 UI32;
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| 15 | typedef signed __int32 SI32;
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| 16 | typedef unsigned __int64 UI64;
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| 17 | typedef signed __int64 SI64;
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| 18 |
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| 19 |
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| 20 | typedef SI32 (NTAPI *PFN_NT_QUERY_PERFORMANCE_COUNTER)(OUT PLARGE_INTEGER PerformanceCounter, OUT PLARGE_INTEGER PerformanceFrequency OPTIONAL);
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| 21 |
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| 22 |
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| 23 | int __cdecl main(void)
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| 24 | {
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| 25 | LARGE_INTEGER PerformanceCounter, PerformanceFrequency;
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| 26 | HMODULE Ntdll;
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| 27 | PFN_NT_QUERY_PERFORMANCE_COUNTER NtQueryPerformanceCounter;
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| 28 | UI64 StartTime, StartTick;
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| 29 | SI32 Status;
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| 30 |
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| 31 | Ntdll = GetModuleHandleW(L"ntdll.dll");
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| 32 | NtQueryPerformanceCounter = (PFN_NT_QUERY_PERFORMANCE_COUNTER) GetProcAddress(Ntdll, "NtQueryPerformanceCounter");
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| 33 |
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| 34 | // Take an initial sample of two time sources: the TSC and the HPET
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| 35 | Status = NtQueryPerformanceCounter(&PerformanceCounter, &PerformanceFrequency);
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| 36 | if (Status < 0)
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| 37 | {
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| 38 | printf("NtQueryPerformanceCounter(): %08X\n", Status);
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| 39 | return 0;
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| 40 | }
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| 41 |
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| 42 | StartTick = __rdtsc();
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| 43 | StartTime = PerformanceCounter.QuadPart;
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| 44 |
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| 45 | printf("NtQueryPerformanceCounter(): CTR=0x%016llX FRQ=0x%016llX\r\n", PerformanceCounter.QuadPart, PerformanceFrequency.QuadPart);
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| 46 |
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| 47 | for(size_t i = 0; i < 60; i++)
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| 48 | {
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| 49 | UI64 EndTime, EndTick, DeltaTime, DeltaTick, TickRate;
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| 50 |
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| 51 | // Sleep for a while.
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| 52 | Sleep(1000);
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| 53 |
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| 54 | // Sample the two clocks again. N.B. rdtsc is sampled *first* this time.
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| 55 | EndTick = __rdtsc();
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| 56 | Status = NtQueryPerformanceCounter(&PerformanceCounter, &PerformanceFrequency);
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| 57 | if (Status < 0)
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| 58 | {
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| 59 | printf("NtQueryPerformanceCounter(): %08X\n", Status);
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| 60 | return 0;
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| 61 | }
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| 62 |
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| 63 | EndTime = PerformanceCounter.QuadPart;
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| 64 |
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| 65 | printf("NtQueryPerformanceCounter(): CTR=0x%016llX FRQ=0x%016llX\r\n", PerformanceCounter.QuadPart, PerformanceFrequency.QuadPart);
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| 66 |
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| 67 | DeltaTime = EndTime - StartTime;
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| 68 | DeltaTick = EndTick - StartTick;
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| 69 | TickRate = (DeltaTick * 10000000ull) / DeltaTime;
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| 70 |
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| 71 | printf("[%2u] TIME=+%llu.%03u TICKS=+%llu (%llu ticks/s)\r\n", i, DeltaTime / 10000000ull, (unsigned int)(DeltaTime % 10000000ull) / 10000, DeltaTick, TickRate);
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| 72 |
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| 73 | EndTick += DeltaTick;
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| 74 | EndTime += DeltaTime;
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| 75 | }
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| 76 |
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| 77 | return 0;
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| 78 | }
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