frmdeadlock.cs

清华大学出版社出版的 移动应用开发宝典 张大威（2008）的附书源代码

using System;
using System.Windows.Forms;
using System.Threading;
using System.Diagnostics;

namespace CodeForChapter11cs
{
  public partial class frmDeadlock : Form
  {
    public frmDeadlock()
    {
      InitializeComponent();
    }

    object someLock = new object();
    object someOtherLock = new object();

    private void menuItem1_Click(object sender, EventArgs e)
    {
      Thread t1 = new Thread(this.DeadlockOne);
      t1.Name = "Worker Thread 1 ";
      //t1.IsBackground = true;
      Thread t2 = new Thread(this.DeadlockTwo);
      t2.Name = "Worker Thread 2 ";
      //t2.IsBackground = true;

      t1.Start();
      t2.Start();
    }

    private void DeadlockOne()
    {
      Debug.WriteLine(Thread.CurrentThread.Name + " enters DeadLockOne");
      lock (someLock)
      {
        Debug.WriteLine(Thread.CurrentThread.Name + " obtained SomeLock");
        // run some code
        Thread.Sleep(1); //simulate a context switch
        lock (someOtherLock)
        {
          Debug.WriteLine(Thread.CurrentThread.Name + " obtained SomeOtherLock");
          //run some more code
        }
      }
      MessageBox.Show("Thread 1 done");
    }

    private void DeadlockTwo()
    {
      Debug.WriteLine(Thread.CurrentThread.Name + " enters DeadLockTwo");
      lock (someOtherLock)
      {
        Debug.WriteLine(Thread.CurrentThread.Name + " obtained SomeOtherLock");
        // run some code
        this.AnotherDemoMethod();
      }
      MessageBox.Show("Thread 2 done");
    }

    private void AnotherDemoMethod()
    {
      Debug.WriteLine(Thread.CurrentThread.Name + " enters AnotherDemoMethod");
      lock (someLock)
      {
        Debug.WriteLine(Thread.CurrentThread.Name + " obtained SomeLock");
        //run some more code
      }
    }
  }
}