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Thread: How to avoid the Deadlock in the below program

  1. #1
    Junior Member
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    Nov 2009
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    Default How to avoid the Deadlock in the below program

    Hello Friends,

    I am learning java now.I know the following program has deadlock, now i trying the avoid the deadlock for this
    program so please post your some suggestions how to avoid the deadlock for the below.
    class A
    {
    	synchronized void foo(B b)
    	{
    		System.out.println(Thread.currentThread().getName()+"  Entered into A.foo()");
     
    		try
    		{
    			Thread.sleep(1000);
    		}
    		catch (InterruptedException e)
    		{
    			System.out.println("A Caught Exception");
    		}
     
    		System.out.println(Thread.currentThread().getName()+" Now trying to Access b.last()");
    		b.last();
    		System.out.println(Thread.currentThread().getName()+" Now trying to Access b.Info()");
    		b.info();
     
    	}
    	synchronized void last()
    	{
    		System.out.println(Thread.currentThread().getName()+"  Entered into A.last()");
     
    	}
    	void msg()
    	{
    		System.out.println(Thread.currentThread().getName()+"  Entered into A.msg()");
    	}
    }
    class B
    {
    	synchronized void bar(A a)
    	{
    		System.out.println(Thread.currentThread().getName()+"  Entered into B.bar()");
     
    		try
    		{
    			Thread.sleep(1000);
    		}
    		catch (Exception e)
    		{
    			System.out.println("B Caught Exception");
    		}
    		System.out.println(Thread.currentThread().getName()+" Now trying to Access A.last()");
    		a.last();
    		System.out.println(Thread.currentThread().getName()+" Now trying to Access A.msg()");
    		a.msg();
    	}
    	synchronized void last()
    	{
    		System.out.println(Thread.currentThread().getName()+"  Entered into B.last()");
    	}
    	void info()
    	{
    		System.out.println(Thread.currentThread().getName()+"  Entered into B.info()");
    	}
    }
    class  DeadLockTest2 implements Runnable
    {
    	A a=new A();
    	B b=new B();
     
    	DeadLockTest2()
    	{
    		Thread.currentThread().setName("Thread1");
    		System.out.println(Thread.currentThread().getName()+" Is Now Running");
    		new Thread(this,"Thread2").start();
    		System.out.println(Thread.currentThread().getName()+" Is Now Running");
    		System.out.println(Thread.currentThread().getName()+" is trying to get the lock on A.foo()");
    		a.foo(b);
    		System.out.println(Thread.currentThread().getName()+" is got  the lock on A.foo()");
    		nonSyn();
    	}
    	public void run()
    	{
    		System.out.println(Thread.currentThread().getName()+" Is Now Running");
    		System.out.println(Thread.currentThread().getName()+" is trying to get the lock on B.bar()");
    		b.bar(a);
    		System.out.println(Thread.currentThread().getName()+" is got  the lock on B.bar()");
    		nonSyn();
     
    	}
    	public void nonSyn()
    	{
    		a.msg();
    		b.info();
    	}
    	public static void main(String[] args) 
    	{
    		new DeadLockTest2();
    	}
    }
    Last edited by helloworld922; April 15th, 2010 at 09:40 PM.


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