有空帮我看一下,多线程(问题:从不同步的代码块中调用了对象同步方法)

最新推荐文章于 2024-04-22 11:14:42 发布

F__35

最新推荐文章于 2024-04-22 11:14:42 发布

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文章标签：多线程 thread object class button system

本文链接：https://blog.youkuaiyun.com/F__35/article/details/1911840

本文通过一个Windows应用程序示例，展示了如何在多线程环境中处理对象同步问题。当按钮被点击时，启动两个线程，一个负责增加数值并更新文本框，另一个负责读取数值并显示。使用Monitor类进行线程同步，确保在特定条件下对共享资源的访问是互斥的，并通过 Pulse 和 Wait 方法控制线程执行流程。

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using System;
using System.Threading;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace WindowsApplication6_线程同步
{
    public partial class Form1 : Form
    {
        //Forms.Control.CheckForIllegalCrossThreadCalls   =   false;
        public Int64 number;
        Thread thread1;
        Thread thread2;
        public bool fSync = false;
        public common oCommon;
        AddNumberClass addclass;
        ReadNumber readclass;
        public Form1()
        {
            InitializeComponent();
            oCommon = new common();
        }

private void Form1_Load(object sender, EventArgs e)
{

Control.CheckForIllegalCrossThreadCalls = false;

        }
        private void button1_Click(object sender, EventArgs e)
        {
            addclass = new AddNumberClass(this);
            addclass.oCommon = oCommon;
            thread1 = new Thread(new ThreadStart(addclass.Add));
            thread1.Start();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            readclass = new ReadNumber(this);
            readclass.oCommon = oCommon;
            thread2 = new Thread(new ThreadStart(readclass.Read));
            thread2.Start();
        }

        private void checkBox1_CheckedChanged(object sender, EventArgs e)
        {
            fSync = !fSync;
        }
    }
    public class common
    {

}

    public class AddNumberClass
    {
        public common oCommon;
        Form1 oform;
        public AddNumberClass(Form1 form)
        {
            oform = form;
        }
        // The nethod that will be called when the thread is started
        public void Add()
        {
            int cLoop = 10;
            //Obtain the lock
            if (oform.fSync)
            {
                Monitor.Enter(oCommon);
            }
            while ((cLoop--) > 0)
            {
                oform.number++;
                Int64 n = oform.number;
                oform.textBox1.Text = n.ToString();

                if (oform.fSync)
                {
                    //Signal for next thread in wait queue to proceed
                    Monitor.Pulse(oCommon);
                }

                Thread.Sleep(100);
                if (oform.fSync)
                {
                    //Realease the lock and wait to be Notified
                    Monitor.Wait(oCommon);
                }
                //Realease the lock
                if (oform.fSync)
                {
                    Monitor.Exit(oCommon);
                }
            }
        }
    }

    public class ReadNumber
    {
        public common oCommon;
        Form1 oform;
        public ReadNumber(Form1 form)
        {
            oform = form;
        }
        public void Read()
        {
            int cLoop = 10;
            if (oform.fSync)
            {
                Monitor.Enter(oCommon);
            }
            while((cLoop--)>0)
            {
                Int64 n=oform.number;
                oform.textBox2.Text=n.ToString();
                if(oform.fSync)
                {
                    //Signal for next thred in wait queue to proceed
                    Monitor.Pulse(oCommon);
                }

                Thread.Sleep(100);
                if(oform.fSync)
                {
                    //Realease the lock and wait to be Notified
                    Monitor.Wait(oCommon);
                }
                if(oform.fSync)
                {
                    //Realease the lock
                    Monitor.Exit(oCommon);
                }

            }
        }
    }
}