Click here to Skip to main content
Click here to Skip to main content
Add your own
alternative version
Go to top

Testing reader/writer locks

, 20 Jan 2009
This article describes testing the results of reader/writer locks on Windows XP/Vista Uniprocessor and Multi-core PCs.
#pragma once
#include <exception>
class Performance_counter_meter
{
public:
	Performance_counter_meter()
	{
		m_counter = 0L;
		m_frequency.QuadPart = m_performance_counter_start.QuadPart = m_duration.QuadPart = 0L;
		if ( FALSE == ::QueryPerformanceFrequency(&m_frequency) )
		{
			throw std::exception("Failed to initialize performance counter."); 
		}
	}
	bool start(void)
	{
		return (::QueryPerformanceCounter(&m_performance_counter_start) != FALSE);
	}
	bool end(void)
	{
		LARGE_INTEGER performance_counter;
		bool rc = (::QueryPerformanceCounter(&performance_counter) != FALSE);
		m_duration.QuadPart += performance_counter.QuadPart - m_performance_counter_start.QuadPart;
		return rc;
	}
	double get_duration(void)
	{
		return (double)m_duration.QuadPart / m_frequency.QuadPart;
	}
	bool get_current_duration(double& duration)
	{
		LARGE_INTEGER performance_counter, counter_duration;
		bool rc = (::QueryPerformanceCounter(&performance_counter) != FALSE);
		counter_duration.QuadPart = performance_counter.QuadPart - m_performance_counter_start.QuadPart;
		duration = (double)counter_duration.QuadPart / m_frequency.QuadPart;
		return rc;
	}
	LONGLONG get_counter(void)
	{
		return m_counter;
	}
	void set_iteration_done(LONGLONG iteration_done)
	{
		m_counter = iteration_done;
	}

private:
	LARGE_INTEGER m_frequency;
	LARGE_INTEGER m_performance_counter_start;
	LARGE_INTEGER m_duration;
	LONGLONG m_counter;
};

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

About the Author

Valery Grebnev
Software Developer
Canada Canada
No Biography provided

| Advertise | Privacy | Mobile
Web03 | 2.8.140926.1 | Last Updated 21 Jan 2009
Article Copyright 2009 by Valery Grebnev
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid