MPerfCounter.h


/*
Copyright (c) 2016-present Maximus5
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
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   notice, this list of conditions and the following disclaimer.
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   documentation and/or other materials provided with the distribution.
3. The name of the authors may not be used to endorse or promote products
   derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ''AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/


#pragma once

#include "defines.h"
#include "MArray.h"

struct PerfCounter
{
	// ID must be filled before calling `Start`
	UINT ID;
	// For internal use
	BOOL Initialized;
	// Caller must not change this value
	LARGE_INTEGER Start;
};

class MPerfCounter
{
protected:
	// QueryPerformanceFrequency()
	LARGE_INTEGER m_Frequency;
	// Total captured time for all counters
	LARGE_INTEGER m_Total;

protected:
	// Data storage
	struct PerfCounterData
	{
		BOOL Initialized;
		LONG Count;
		LARGE_INTEGER Start;
		LARGE_INTEGER Stop;
		LARGE_INTEGER Duration;
	};

	// The object support counting several counters
	MArray<PerfCounterData> m_Counters;

public:
	MPerfCounter(UINT Counters = 1);
	~MPerfCounter();

	// ID = 0..(Counters-1)
	void Start(PerfCounter& counter);
	void Stop(PerfCounter& counter);

	ULONG GetCounter(UINT ID, ULONG* pPercentage, ULONG* pMilliSeconds, LARGE_INTEGER* pDuration);

};