mirror of https://github.com/tongzx/nt5src
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
101 lines
2.3 KiB
101 lines
2.3 KiB
//+------------------------------------------------------------------------
|
|
//
|
|
// Microsoft Windows
|
|
// Copyright (C) Microsoft Corporation, 1993.
|
|
//
|
|
// File: stopwtch.cxx
|
|
//
|
|
// Contents: StopWatch timer
|
|
//
|
|
// Classes: CStopWatch
|
|
//
|
|
// Functions:
|
|
//
|
|
// History: 30-June-93 t-martig Created
|
|
//
|
|
//--------------------------------------------------------------------------
|
|
|
|
extern "C"
|
|
{
|
|
#include <nt.h>
|
|
#include <ntrtl.h>
|
|
#include <nturtl.h>
|
|
};
|
|
#include <windows.h>
|
|
#include <stopwtch.hxx>
|
|
|
|
|
|
//+-------------------------------------------------------------------
|
|
//
|
|
// Member: CStopWatch::Resolution, public
|
|
//
|
|
// Synopsis: Inquires performance timer resolution
|
|
//
|
|
// Returns: Performance counter ticks / second
|
|
//
|
|
// History: 30-June-93 t-martig Created
|
|
//
|
|
//--------------------------------------------------------------------
|
|
CStopWatch::CStopWatch ()
|
|
{
|
|
QueryPerformanceFrequency (&liFreq);
|
|
}
|
|
|
|
//+-------------------------------------------------------------------
|
|
//
|
|
// Member: CStopWatch::Reset, public
|
|
//
|
|
// Synopsis: Starts measurement cycle
|
|
//
|
|
// History: 30-June-93 t-martig Created
|
|
//
|
|
//--------------------------------------------------------------------
|
|
|
|
void CStopWatch::Reset ()
|
|
{
|
|
QueryPerformanceCounter (&liStart); // BUGBUG - test for error !
|
|
}
|
|
|
|
|
|
//+-------------------------------------------------------------------
|
|
//
|
|
// Member: CStopWatch::Read, public
|
|
//
|
|
// Synopsis: Reads stop watch timer
|
|
//
|
|
// Returns: Time since call of CStopWatch::Reset (in microseconds)
|
|
//
|
|
// History: 30-June-93 t-martig Created
|
|
//
|
|
//--------------------------------------------------------------------
|
|
|
|
ULONG CStopWatch::Read ()
|
|
{
|
|
LARGE_INTEGER liNow, liDelta, liRemainder;
|
|
|
|
QueryPerformanceCounter (&liNow); // BUGBUG - test for error
|
|
|
|
liDelta = RtlLargeIntegerSubtract (liNow, liStart);
|
|
liDelta = RtlExtendedIntegerMultiply (liDelta, 1000000);
|
|
liDelta = RtlLargeIntegerDivide (liDelta, liFreq, &liRemainder);
|
|
|
|
return liDelta.LowPart;
|
|
}
|
|
|
|
|
|
//+-------------------------------------------------------------------
|
|
//
|
|
// Member: CStopWatch::Resolution, public
|
|
//
|
|
// Synopsis: Inquires performance timer resolution
|
|
//
|
|
// Returns: Performance counter ticks / second
|
|
//
|
|
// History: 30-June-93 t-martig Created
|
|
//
|
|
//--------------------------------------------------------------------
|
|
|
|
ULONG CStopWatch::Resolution ()
|
|
{
|
|
return liFreq.LowPart;
|
|
}
|