.NET线程同步（1）

   在处理.net线程同步问题,有许多办法,这里所将谈到的是特定代码区的同步.

   这些特定的代码区是方法中重要的代码段,他们可以改变对象的状态,或者更新另一个资源.

Monitor类用于同步代码去,其方式是使用Monitor.Enter()方法获得一个锁,然后使用Monitor.Exit()方法释放该锁.

示例如下:

using System;
using System.Threading;

namespace EnterExit
{
  public class EnterExit
 {
  private int result=0;
  public  EnterExit()
  {
  }

  public void NonCriticalSection()
  {
   Console.WriteLine("Enter Threah"+Thread.CurrentThread.GetHashCode());
   for(int i=1;i<=5;i++)
   {
    Console.WriteLine("Result="+result++ +" ThreadID"+Thread.CurrentThread.GetHashCode());
    Thread.Sleep(1000);
   }
   Console.WriteLine("Exiting Threah"+Thread.CurrentThread.GetHashCode());
  }

  public void CriticalSection()
  {
   Monitor.Enter(this);
   Console.WriteLine("Enter Threah"+Thread.CurrentThread.GetHashCode());
   for(int i=1;i<=5;i++)
   {
    Console.WriteLine("Result="+result++ +" ThreadID"+Thread.CurrentThread.GetHashCode());
    Thread.Sleep(1000);
   }
   Console.WriteLine("Exiting Threah"+Thread.CurrentThread.GetHashCode());
   Monitor.Exit(this);
  }

  public static void Main(String[] args)
      {
   
   EnterExit e=new EnterExit();
   if(args.Length>0)
   {
    Thread nt1=new Thread(new ThreadStart(e.NonCriticalSection));
    nt1.Start();

    Thread nt2=new Thread(new ThreadStart(e.NonCriticalSection));
    nt2.Start();
   }
   else
   {
    Thread ct1=new Thread(new ThreadStart(e.CriticalSection));
    ct1.Start();

    Thread ct2=new Thread(new ThreadStart(e.CriticalSection));
    ct2.Start();
   }
      }
 }

}

 

运行结果:

Enter Threah 1

Result=0 Thread1

Result=1 Thread1

Result=2 Thread1

Result=3 Thread1

Result=4 Thread1

Exiting Thread1

Enter Threah 2

Result=5 Thread2

Result=6 Thread2

Result=7 Thread2

Result=8 Thread2

Result=9 Thread2

Exiting Thread2

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