简单示例代码，多线程见协作

一个简单的多线程示例，主要目的就是给一个账户加钱和给账户减钱，当账户余额小于一个值的时候，减钱的线程必须停止减钱，等有足够钱时，才能继续减钱。

using System;

using System.Collections.Generic;

using System.Text;

/*

 多线程演示实例

 */

namespace MultThreadExample

{

    class Program

    {

        static Account account = new Account();

        static void Main(string[] args)

        {

            System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(add));

            System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(subtract));

            Console.ReadLine();

        }

        static void add(object obj)

        {

            while (true)

            {

                account.Add();

                System.Threading.Thread.Sleep(1000);

            }

        }

        static void subtract(object obj)

        {

            while (true)

            {

                account.subtract();

                System.Threading.Thread.Sleep(100);

            }

        }

    }

    class Account

    {

        private object m_lock=new object();

        private int _count=0;

        public void Add()

        {

            lock (m_lock)

            {



                _count = _count + 1;

                Console.WriteLine("count:" + _count + "\t Add");

                System.Threading.Monitor.PulseAll(m_lock);



            }

        }

        public void subtract()

        {

            lock (m_lock)

            {



                while (_count <= 5)

                {

                    System.Threading.Monitor.Wait(m_lock);

                }

                _count--;

                Console.WriteLine("count:" + _count + "\t subtract");

            }



        }

    }

}

稍做修改，生产者消费者问题。

 

namespace ConsoleApplication1
{
    class Program
    {
        static Account account = new Account();
        static void Main(string[] args)
        {
            System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(add));
            System.Threading.ThreadPool.QueueUserWorkItem(new System.Threading.WaitCallback(subtract));
            Console.ReadLine();
        }
        static void add(object obj)
        {
            while (true)
            {
                account.Add();
                System.Threading.Thread.Sleep(2000);
            }
        }
        static void subtract(object obj)
        {
            while (true)
            {
                account.subtract();
                System.Threading.Thread.Sleep(8000);
            }
        }
    }
    class Account
    {
        private object m_lock=new object();
        private System.Collections.ArrayList _ary = new System.Collections.ArrayList();
        public void Add()
        {
            lock (m_lock)
            {
                while (_ary.Count >= 5)
                {
                    //队列满
                    Console.WriteLine("队列满，等待消费:" );
                    System.Threading.Monitor.Wait(m_lock);
                }
                _ary.Add("product");
                Console.WriteLine("生产者 增加: 队列长度:" + _ary.Count);
                System.Threading.Monitor.Pulse(m_lock);
                
            }
        }
        public void subtract()
        {
            lock (m_lock)
            {

                while (_ary.Count <= 0)
                {
                    Console.WriteLine("队列空，等待生产:");
                    System.Threading.Monitor.Wait(m_lock);
                }
                _ary.RemoveAt(0);
                Console.WriteLine("消费者 减少: 队列长度:" + _ary.Count);
                System.Threading.Monitor.Pulse(m_lock);
            }

        }
    }
}