線程同步之死結

public class StateObject{

   int state=5;

   public void   ChangeState(int loop)

  {

     if(state==5)

    {

       state++;

       Trace.Assert(state==6,"");

      

    }

     state=5;

  }

}

 

 public class SampleThread

 {

      public StateObject so1;

      pulbic StateObject so2;

      public SampleTrhead( StateObject o1,StateObject o2)

     {

        this.so1=o1,this.so2=o2;

     }

    public void Deadlock()

    {

      int i=0;

     while(true)

     {

        lock(so1)

        {

               lock(so2){

                so1.ChangeState(i);

                so2.ChangeState(i++);

              Console.WriteLine("still running,{0}",i);

           }

        }   

        }

   

     }

    public void Deadlock2()

    {  int i=0;

     while(true)

     {

        lock(so2)

        {

               lock(so1){

                so1.ChangeState(i);

                so2.ChangeState(i);   

        Console.WriteLine("still running,{0}",i);

           }

        }   

        }

    }

 }

 

 

StateObject state1= new StateObject();

StateObject state2= new StateObject();

new Thread(new SampleThread(state1,state2).Deadlock1)).Start();

new Thread(new SampleThread(state1,Sate2).Deadlock2)).Start();