C# 生产者和消费者问题使用Monitor同步

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;

namespace ConsoleApplication1
{
    public class Program
    {
        static void Main(string[] args)
        {
            SyncStack ss = new SyncStack();
            Producer p = new Producer(ss);
            Consumer c = new Consumer(ss);
            new Thread(p.run).Start();
            new Thread(c.run).Start();
        }
    }
    public class Cake
    {
        int id;
        public Cake(int id)
        {
            this.id = id;
        }
        public String toString()
        {
            return "Cake" + id;
        }
    }
    public class SyncStack
    {
        int index = 0;
        Cake[] arrWT = new Cake[4];
        public void push(Cake wt)
        {
            try
            {
                Monitor.Enter(this);
                while (index == arrWT.Length)
                {
                    try
                    {

                        Console.WriteLine("已经生产满了！");
                        Monitor.Wait(this);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                }
                Monitor.Pulse(this);
                arrWT[index] = wt;
                index++;
            }
            finally
            {
                Monitor.Exit(this);
            }
        }
        public Cake pop()
        {
            try
            {
                Monitor.Enter(this);
                while (index == 0)
                {
                    try
                    {
                        Console.WriteLine("已经消费空了！");
                        Monitor.Wait(this);
                    }
                    catch (Exception ex)
                    {
                        Console.WriteLine(ex.Message);
                    }
                }
                Monitor.Pulse(this);
                index--;
                return arrWT[index];
            }
            finally
            {
                Monitor.Exit(this);
            }
        }
    }
    public class Producer
    {

        private bool flag = true;
        private SyncStack m_syncStack = null;
        public Producer(SyncStack ss)
        {
            this.m_syncStack = ss;
        }
        public void run()
        {
            int i = 0;
            while (flag)
            {
                Cake wt = new Cake(i);
                i++;
                m_syncStack.push(wt);
                Console.WriteLine("生产了：" + wt.toString());
            }
        }
        public void Shutdown()
        {
            flag = false;
        }
    }
    public class Consumer
    {
        private bool flag = true;
        private SyncStack m_syncStack = null;
        public Consumer(SyncStack ss)
        {
            this.m_syncStack = ss;
        }
        public void run()
        {
            while (flag)
            {

                Cake wt = m_syncStack.pop();
                Console.WriteLine("消费了：" + wt.toString());
                try
                {
                    Thread.Sleep(2000);
                }
                catch (Exception ex)
                {
                    Console.WriteLine(ex.Message);
                }
            }
        }
        public void Shutdown()
        {
            flag = false;
        }
    }
}