using System;

using System.Threading;

using System.Threading.Tasks;

using System.Collections.Generic;

using System.Collections;

using System.Diagnostics;

​

public class Program

{

    static AutoResetEvent autoEvent;

    public static void Main()

    {

        StopWatchTest();

    }

    public static void StopWatchTest(){

     Stopwatch stopwatch = new Stopwatch();

        Random rnd = new Random(100);

        byte [] testBytes = new byte[150];

        // begin timing

        stopwatch.Start();

        rnd.NextBytes(testBytes);

        for(int i = 0 ; i < testBytes.Length; i++)

        {

            Thread.Sleep(1);

            Console.WriteLine(testBytes[i]);

        }

        stopwatch.Stop();

        Console.WriteLine($"Time elapsed: {stopwatch.Elapsed}");

    }

    ///

    public static void TestMonitor()

    {

        List<Task> tasks = new List<Task>();

        Random rnd = new Random();

        long total = 0;

        int n = 0;

        for (int taskCtr = 0; taskCtr < 10; taskCtr++)

        {

            // add task and run

            tasks.Add(Task.Run(() =>

            {

                int[] values = new int[100];

                long taskTotal = 0;

                int taskN = 0;

                int ctr = 0;

                Monitor.Enter(rnd);

                // generate 10,000 random integers

                for (ctr = 0; ctr < 100; ctr++)

                {

                    values[ctr] = rnd.Next(0, 1001);

                }

​

                Monitor.Exit(rnd);

                taskN = ctr;

                foreach (var value in values)

                {

                    taskTotal += value;

                }

​

                Console.WriteLine($"Mean for task {Task.CurrentId} : {(taskTotal * 1.0 / taskN)} (N={taskN})");

                Interlocked.Add(ref n, taskN);

                Interlocked.Add(ref total, taskTotal);

            }

​

            ));

        }

​

        try

        {

            Task.WaitAll(tasks.ToArray());

            Console.WriteLine($"Mean for all tasks: {(total * 1.0) / n} (N={n}");

        }

        catch (AggregateException ex)

        {

            foreach (var e in ex.InnerExceptions)

            {

                Console.WriteLine($"{e.GetType().Name} {e.Message}");

            }

        }

    }

}