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What is it doing ?!

2 replies on 1 page. Most recent reply: Aug 1, 2003 6:42 AM by DJ

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DJ

Posts: 2
Nickname: cipherchap
Registered: Aug, 2003

What is it doing ?!

Posted: Aug 1, 2003 6:13 AM

Could somebody please explain why shouldn't the argument of the synchronized block be an instant of the SyncTest class?


class SyncTest extends Thread
{    
   public void run()    
   {        
       synchronized(SyncTest.class)   
       {             
          ......            
       }    
   }    
 
   public static void main(String[] args)    
   {        
       new SyncTest().start();        
       new SyncTest().start();    
   }
}

David

Posts: 150
Nickname: archangel
Registered: Jul, 2003

Re: What is it doing ?!

Posted: Aug 1, 2003 6:18 AM

You are not passing an INSTANCE of the SyncTest class to the synchronized block. You are passing the class object of the SyncTest class. This is typically used when synchronizing on static methods. It should read:


  synchronized(this) {
  }

DJ

Posts: 2
Nickname: cipherchap
Registered: Aug, 2003

Re: What is it doing ?!

Posted: Aug 1, 2003 6:42 AM

The code is indeed an extract from an example. Since I am new to synchronization, I would really like to know the mechanism behind this sample, especially to how should we decide on which object be taken as an argument for the synchronized block ? Say for instance, why should the class object be used instead of the instance object in this case ? Appreciate if a detail elaboration could be provided. Thanx.

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