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上接稳扎稳打Silverlight(26) - 2.0线程之Lock, Interlocked, EventWaitHandle, Monitor

3、EventWaitHandle.xaml
<UserControl x:Class="Silverlight20.Thread.EventWaitHandle"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <StackPanel HorizontalAlignment="Left" Margin="5">

                <TextBlock x:Name="txtAutoResetEvent" />
                
                <TextBlock x:Name="txtManualResetEvent" />

        </StackPanel>
</UserControl>
 
EventWaitHandle.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;


namespace Silverlight20.Thread

{

         public partial class EventWaitHandle : UserControl

        {

                 // AutoResetEvent(bool state) - 通知其他线程是否可入的类,自动 Reset()

                 //         bool state - 是否为终止状态,即是否禁止其他线程入内

                 private System.Threading.AutoResetEvent autoResetEvent =    

                         new System.Threading.AutoResetEvent( false);


                 // ManualResetEvent(bool state) - 通知其他线程是否可入的类,手动 Reset()

                 //         bool state - 是否为终止状态,即是否禁止其他线程入内

                 private System.Threading.ManualResetEvent manualResetEvent =    

                         new System.Threading.ManualResetEvent( false);


                 private static int i;


                 public EventWaitHandle()

                {

                        InitializeComponent();


                         // 演示 AutoResetEvent

                        AutoResetEventDemo();


                         // 演示 ManualResetEvent

                        ManualResetEventDemo();

                }


                 private void AutoResetEventDemo()

                {

                        i = 0;


                         for ( int x = 0; x < 100; x++)

                        {

                                 // 开 100 个线程去操作静态变量 i

                                System.Threading.Thread thread =

                                         new System.Threading.Thread( new System.Threading.ThreadStart(AutoResetEventDemoCallback));

                                thread.Start();


                                 // 阻塞当前线程,直到 AutoResetEvent 发出 Set() 信号

                                autoResetEvent.WaitOne();

                        }


                        System.Threading.Thread.Sleep(1000);

                         // 1 秒后 100 个线程都应该执行完毕了,取得 i 的结果

                        txtAutoResetEvent.Text = i.ToString();

                }


                 private void AutoResetEventDemoCallback()

                {

                         try

                        {

                                 int j = i + 1;


                                 // 模拟多线程并发操作静态变量 i 的情况

                                System.Threading.Thread.Sleep(5);


                                i = j;

                        }

                         finally

                        {

                                 // 发出 Set() 信号,以释放 AutoResetEvent 所阻塞的线程

                                autoResetEvent.Set();

                        }

                }



                 private void ManualResetEventDemo()

                {

                        i = 0;


                         for ( int x = 0; x < 100; x++)

                        {

                                 // Reset() - 将 ManualResetEvent 变为非终止状态,即由此线程控制 ManualResetEvent,

                                 //         其他线程排队,直到 ManualResetEvent 发出 Set() 信号(AutoResetEvent 在 Set() 时会自动 Reset())

                                manualResetEvent.Reset();


                                 // 开 100 个线程去操作静态变量 i

                                System.Threading.Thread thread =

                                         new System.Threading.Thread( new System.Threading.ThreadStart(ManualResetEventDemoCallback));

                                thread.Start();


                                 // 阻塞当前线程,直到 ManualResetEvent 发出 Set() 信号

                                manualResetEvent.WaitOne();

                        }


                        System.Threading.Thread.Sleep(1000);

                         // 1 秒后 100 个线程都应该执行完毕了,取得 i 的结果

                        txtManualResetEvent.Text = i.ToString();

                }


                 private void ManualResetEventDemoCallback()

                {

                         try

                        {

                                 int j = i + 1;


                                 // 模拟多线程并发操作静态变量 i 的情况

                                System.Threading.Thread.Sleep(5);


                                i = j;

                        }

                         finally

                        {

                                 // 发出 Set() 信号,以释放 ManualResetEvent 所阻塞的线程,同时 ManualResetEvent 变为终止状态)

                                manualResetEvent.Set();

                        }

                }

        }

}
 
 
4、Monitor.xaml
<UserControl x:Class="Silverlight20.Thread.Monitor"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <StackPanel HorizontalAlignment="Left" Margin="5">

                <TextBlock x:Name="txtMsg" />

        </StackPanel>
</UserControl>
 
Monitor.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;


namespace Silverlight20.Thread

{

         public partial class Monitor : UserControl

        {

                 private static readonly object objLock = new object();

                 private static int i;

                

                 public Monitor()

                {

                        InitializeComponent();


                        i = 0;


                         for ( int x = 0; x < 100; x++)

                        {

                                 // 开 100 个线程去操作静态变量 i

                                System.Threading.Thread thread = new System.Threading.Thread( new System.Threading.ThreadStart(DoWork));

                                thread.Start();

                        }


                        System.Threading.Thread.Sleep(1000);

                         // 1 秒后 100 个线程都应该执行完毕了,取得 i 的结果

                        txtMsg.Text = i.ToString();

                }


                 private void DoWork()

                {

                         try

                        {

                                 // Monitor - 提供同步访问对象的机制


                                 // Enter() - 在指定对象上获取排他锁

                                System.Threading.Monitor.Enter(objLock);


                                 int j = i + 1;


                                 // 模拟多线程并发操作静态变量 i 的情况

                                System.Threading.Thread.Sleep(5);


                                i = j;


                                 // Exit() - 释放指定对象上的排他锁

                                System.Threading.Monitor.Exit(objLock);

                        }

                         finally

                        {

                                 // code

                        }

                }

        }

}
 
 

5、ThreadStaticAttribute.xaml
<UserControl x:Class="Silverlight20.Thread.ThreadStaticAttribute"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"    
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
        <StackPanel HorizontalAlignment="Left" Margin="5">
        
                <TextBlock x:Name="txtMsg" />
                
                <TextBlock x:Name="txtMsg2" />

        </StackPanel>
</UserControl>
 
ThreadStaticAttribute.xaml.cs

using System;

using System.Collections.Generic;

using System.Linq;

using System.Net;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;


namespace Silverlight20.Thread

{

         public partial class ThreadStaticAttribute : UserControl

        {

                 // ThreadStatic - 所指定的静态变量对每个线程都是唯一的

                [System.ThreadStatic]

                 private static int value;


                 // 一般的静态变量,对每个线程都是共用的

                 private static int value2;


                 public ThreadStaticAttribute()

                {

                        InitializeComponent();


                        Demo();

                }


                 void Demo()

                {

                        System.Threading.Thread thread = new System.Threading.Thread(DoWork);

                        thread.Name = "线程1";

                        thread.Start();


                        System.Threading.Thread.Sleep(100);


                        System.Threading.Thread thread2 = new System.Threading.Thread(DoWork2);

                        thread2.Name = "线程2";

                        thread2.Start();


                }


                 void DoWork()

                {

                         for ( int i = 0; i < 10; i++)

                        {

                                 // 线程1对静态变量的操作

                                value++;

                                value2++;

                        }


                         string s = value.ToString(); // value - 本线程独有的静态变量

                         string s2 = value2.ToString(); // value2 - 所有线程共用的静态变量


                         this.dispatcher.BeginInvoke( delegate { txtMsg.Text = s + " - " + s2; });

                         // this.dispatcher.BeginInvoke(delegate { txtMsg.Text = value + " - " + value2; }); // 在UI线程上调用,所以value值为UI线程上的value值,即 0    

                }


                 void DoWork2()

                {

                         for ( int i = 0; i < 10; i++)

                        {

                                 // 线程2对静态变量的操作

                                value++;

                                value2++;

                        }


                         string s = value.ToString(); // value - 本线程独有的静态变量

                         string s2 = value2.ToString(); // value2 - 所有线程共用的静态变量


                         this.dispatcher.BeginInvoke( delegate { txtMsg2.Text = s + " - " + s2; });

                         // this.dispatcher.BeginInvoke(delegate { txtMsg2.Text = value + " - " + value2; }); // 在UI线程上调用,所以value值为UI线程上的value值,即 0    

                }

        }

}
 
 

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