singleton及多线程验证,所有线程完成才继续运行WaitHandle

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading;



namespace SingletonDemo

{



    public sealed class Singleton

    {

        private Singleton() { }



        private static Singleton ins = null;

        private static object obj = new object();



        public static Singleton Instance

        {

            get

            {

                if (ins == null)

                {

                    System.Threading.Thread.Sleep(1000);

               

                    lock (obj)

                    {

                        if (ins == null)

                        {

                            ins = new Singleton();

                        }

                    }

                }

                return ins;

            }

        }



        public void SaySth()

        {

            Console.WriteLine("hello");

        }

        public int MyProperty { get; set; }

    }





    class Program

    {

        static Singleton sin1 = null, sin2 = null;



        static bool b = false;



        static void GetInstance( object obj)

        {            

            if (b==false)

            {

                b = true;

                sin1 = Singleton.Instance;                

            }

            else 

            {

                sin2 = Singleton.Instance;

            }

            (obj as ManualResetEvent).Set();

        }



        static void Main(string[] args)

        {

            //Singleton s1 = new Singleton();

            //Singleton s2 = new Singleton();



            //Singleton ins = Singleton.Instance;

            //ins.SaySth();

            //ins.MyProperty = 13;

            //Console.WriteLine(ins.MyProperty);





            //Console.WriteLine("--------------------");



            //Singleton ins2 = Singleton.Instance;

            //ins2.SaySth();

            //Console.WriteLine(ins2.MyProperty);



            //bool b = Object.ReferenceEquals(ins, ins2);

            //Console.WriteLine(b);



            ManualResetEvent[] manualEvents = new ManualResetEvent[2];



            manualEvents[0] = new ManualResetEvent(false);

            manualEvents[1] = new ManualResetEvent(false);



            Thread thread1 = new Thread(

                new ParameterizedThreadStart(GetInstance));



            Thread thread2 = new Thread(

             new ParameterizedThreadStart(GetInstance));



            thread1.Start(manualEvents[0]);

            thread2.Start(manualEvents[1]);



            WaitHandle.WaitAll(manualEvents);



            //ThreadPool.QueueUserWorkItem(GetInstance, manualEvents[0]);

            //ThreadPool.QueueUserWorkItem(GetInstance, manualEvents[1]); 

            

            sin1.SaySth();

            sin2.SaySth();



            sin1.MyProperty = 1;

            sin2.MyProperty = 2;



            bool b = Object.ReferenceEquals(sin1, sin2);

            Console.WriteLine(b);



            Console.WriteLine("sin1:" + sin1.MyProperty);

            Console.WriteLine("sin2:" + sin2.MyProperty);



            Console.ReadKey();

        }



    }

}