using System;

using System.Diagnostics;

​

public class Clock

{

    private static readonly long start = Stopwatch.GetTimestamp();

    private static readonly double frequency = 1.0 / (double)Stopwatch.Frequency;

    /// <summary>

    /// Time represented as elapsed seconds.

    /// </summary>

    public static double Time

    {

        get

        {

            long diff = Stopwatch.GetTimestamp() - start;

            return (double)diff * frequency;

        }

    }

​

    public event Action OnFixedUpdate;

    private double updateFrequency;

    private double lastUpdate;

    public Clock(double updateFrequency)

    {

        this.updateFrequency = updateFrequency;

    }

​

    public void Start()

    {

        this.lastUpdate = Clock.Time;

    }

​

    public void Tick()

    {

        while ((this.lastUpdate + this.updateFrequency) < Clock.Time)

        {

            if (this.OnFixedUpdate != null)

                this.OnFixedUpdate.Invoke();

            this.lastUpdate += this.updateFrequency;

        }

    }

}

​

public class Program

{

    private static void DoSlow()

    {

        Console.WriteLine("Slow - {0}", Clock.Time);

    }

​

    private static void DoFast()

    {

        Console.WriteLine("Fast - {0}", Clock.Time);

    }

​

    public static void Main()

    {

        Clock fastClock = new Clock(0.02f);

        Clock slowClock = new Clock(1.0f);

        fastClock.OnFixedUpdate += DoFast;

        slowClock.OnFixedUpdate += DoSlow;

        double t = Clock.Time;

        Console.WriteLine(t);

        while(t + 500 > Clock.Time)

        {

            //Console.WriteLine(Clock.Time);

            fastClock.Tick();

            slowClock.Tick();

        }

    }

}