92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
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/*++
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Copyright (c) 1990-2001 Microsoft Corporation
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Module Name:
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perfctr.c
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Abstract:
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This module contains the Win32 Performance Counter APIs
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--*/
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#include "basedll.h"
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__declspec(naked)
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BOOL
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WINAPI
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QueryPerformanceCounter(
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LARGE_INTEGER *lpPerformanceCount
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)
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/*++
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QueryPerformanceCounter - provides access to a high-resolution
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counter; frequency of this counter
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is supplied by QueryPerformanceFrequency
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Inputs:
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lpPerformanceCount - a pointer to variable which
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will receive the counter
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Outputs:
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lpPerformanceCount - the current value of the counter,
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or 0 if it is not available
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Returns:
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TRUE if the performance counter is supported by the
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hardware, or FALSE if the performance counter is not
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supported by the hardware.
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--*/
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{
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__asm {
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mov ecx, DWORD PTR [esp+4] // ecx = lpPerformanceCount
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rdtsc
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mov DWORD PTR [ecx], eax
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mov DWORD PTR [ecx+4], edx
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xor eax, eax
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inc eax // return TRUE;
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ret 4
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}
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}
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BOOL
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WINAPI
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QueryPerformanceFrequency(
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LARGE_INTEGER *lpFrequency
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)
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/*++
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QueryPerformanceFrequency - provides the frequency of the high-
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resolution counter returned by
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QueryPerformanceCounter
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Inputs:
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lpFrequency - a pointer to variable which
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will receive the frequency
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Outputs:
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lpPerformanceCount - the frequency of the counter,
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or 0 if it is not available
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Returns:
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TRUE if the performance counter is supported by the
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hardware, or FALSE if the performance counter is not
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supported by the hardware.
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--*/
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{
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lpFrequency->QuadPart = 733333333i64;
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return TRUE;
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}
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