C#线程

using System;
using System.Threading;

namespace huangyibiao
{
    public class BookShop
    {
        //共享资源
        public int _iBookNumber = 1;

        public void Sale()
        {
            int iTemp;

            lock (this)
            {
                iTemp = _iBookNumber;
                if (iTemp > 0)
                {
                    //卖书过程: 1秒
                    Thread.Sleep(1000);
                    _iBookNumber -= 1;

                    Console.WriteLine("售出一本书!");
                }
                else
                {
                    Console.WriteLine("已经没有书了！");
                }
            }

        }
    }
    class Program
    {
        public static void Main()
        {
            BookShop bs = new BookShop();

            Thread thr1 = new Thread(new ThreadStart(bs.Sale));
            Thread thr2 = new Thread(new ThreadStart(bs.Sale));

            thr1.Start();
            thr2.Start();

            Console.Read();
        }
    }
}