136 lines
2.9 KiB
C++
136 lines
2.9 KiB
C++
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/*++
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Copyright (c) 2002 Microsoft Corporation
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Module Name:
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EmulateSlowCPU.cpp
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Abstract:
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Modify performance testing routines to emulate slower processors.
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Notes:
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This is a general purpose shim.
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History:
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07/16/2002 mnikkel Created.
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--*/
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#include "precomp.h"
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#include <mmsystem.h>
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IMPLEMENT_SHIM_BEGIN(EmulateSlowCPU)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(timeGetTime)
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APIHOOK_ENUM_ENTRY(QueryPerformanceCounter)
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APIHOOK_ENUM_ENTRY(QueryPerformanceFrequency)
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APIHOOK_ENUM_END
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typedef BOOL (*_pfn_QueryPerformanceCounter)(LARGE_INTEGER *lpPerformanceCount);
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typedef BOOL (*_pfn_QueryPerformanceFrequency)(LARGE_INTEGER *lpPerformanceFreq);
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DWORD g_dwDivide = 1;
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BOOL g_btimeGetTime = FALSE;
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/*++
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Don't allow the current time to be equal to the prev time.
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--*/
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DWORD
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APIHOOK(timeGetTime)(VOID)
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{
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if (g_btimeGetTime) {
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LARGE_INTEGER PerfFreq;
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LARGE_INTEGER PerfCount1, PerfCount2;
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if (QueryPerformanceFrequency(&PerfFreq) &&
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QueryPerformanceCounter(&PerfCount1)) {
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do {
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if (!QueryPerformanceCounter(&PerfCount2)) break;
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} while (((double)(PerfCount2.QuadPart - PerfCount1.QuadPart) / PerfFreq.QuadPart) < 0.0001);
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}
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}
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return ORIGINAL_API(timeGetTime)();
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}
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BOOL
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APIHOOK(QueryPerformanceCounter)(
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LARGE_INTEGER *lpPerformanceCount
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)
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{
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BOOL bRet = ORIGINAL_API(QueryPerformanceCounter)(lpPerformanceCount);
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if (lpPerformanceCount) {
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lpPerformanceCount->QuadPart /= g_dwDivide;
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}
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return bRet;
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}
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BOOL
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APIHOOK(QueryPerformanceFrequency)(
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LARGE_INTEGER *lpPerformanceFreq
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)
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{
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BOOL bRet = ORIGINAL_API(QueryPerformanceFrequency)(lpPerformanceFreq);
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if (lpPerformanceFreq) {
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lpPerformanceFreq->QuadPart /= g_dwDivide;
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}
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return bRet;
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}
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BOOL
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NOTIFY_FUNCTION(
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DWORD fdwReason
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)
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{
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if (fdwReason == DLL_PROCESS_ATTACH) {
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g_btimeGetTime = COMMAND_LINE && (_stricmp(COMMAND_LINE, "+timeGetTime") == 0);
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INT64 l1, l2;
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if (QueryPerformanceCounter((LARGE_INTEGER *)&l1) &&
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QueryPerformanceCounter((LARGE_INTEGER *)&l2)) {
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// Calculate the divide factor
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g_dwDivide = (DWORD_PTR)((l2 - l1)) / 5;
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if (g_dwDivide == 0) {
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g_dwDivide = 1;
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}
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LOGN(eDbgLevelInfo, "[NotifyFn] EmulateSlowCPU initialized with divisor %d", g_dwDivide);
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return TRUE;
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}
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}
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return TRUE;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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CALL_NOTIFY_FUNCTION
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APIHOOK_ENTRY(WINMM.DLL, timeGetTime)
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APIHOOK_ENTRY(KERNEL32.DLL, QueryPerformanceCounter)
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APIHOOK_ENTRY(KERNEL32.DLL, QueryPerformanceFrequency)
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HOOK_END
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IMPLEMENT_SHIM_END
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