Coding4Fun: 讓Windows桌面凍結的.NET程式

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.Linq;

using System.Text;

using System.Threading;

namespace SystemHang

{

    class Program

    {

        static void Main(string[] args)

        {

            //由傳入參數決定要不要讓Windows卡卡

            bool freeze = (args.Length > 0 && args[0] == "freeze");

            var p = Process.GetCurrentProcess();

            //卡卡模式時，將Process優先等級拉到RealTime

            //註: 實務上幾乎沒有需要設定RealTime的情境(叔叔有練過，小朋友不要學)

            if (freeze)

                p.PriorityClass = ProcessPriorityClass.RealTime;

            //建立八條Thread，就算i7有四核八緒的也要趕盡殺絕

              Thread[] threads = new Thread[8];

            //使用ManualResetEvent做執行緒同步

              ManualResetEvent[] waits = new ManualResetEvent[threads.Length];

            //設定刑求時間10秒

              DateTime timeUp = DateTime.Now.AddSeconds(10);

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

            {

                var wait = waits[i] = new ManualResetEvent(false);

                threads[i] = new Thread(() =>

                {

                    //於時限內形成空迴圈，讓條件比對耗盡CPU資源

                    while (DateTime.Now.CompareTo(timeUp) < 0)

                    {

                        //什麼都不做，讓迴圈快速轉動

                    }

                    //通知執行完畢

                    wait.Set();

                });

                //卡卡模式時，指定執行緒優先等級為Highest

                if (freeze)

                    threads[i].Priority = ThreadPriority.Highest;

                //啟動執行緒

                threads[i].Start();

            }

            //等待所有執行緒執行完畢

            WaitHandle.WaitAll(waits);

            Console.WriteLine("Done!");

        }

    }

}