Is it deadlock?

[abalfazl hossein]

Hello

   
 
class Reentrant {
 
  public synchronized void a() {
      b();
      System.out.println("here I am, in a()");
  }
  public synchronized void b() {
      System.out.println("here I am, in b()");
  }
} 

In the above code, the synchronized method a(), when executed, obtains a lock on it's own object. It then calls synchronized method b() which also needs to acquire a lock on it's own object. If Java did not allow a thread to reacquire it's own lock method b() would be unable to proceed until method a() completed and released the lock; and method a() would be unable to complete until method b() completed. Result: deadlock


Is it deadlock?
[ October 30, 2007: Message edited by: Jim Yingst ]

[Jim Yingst]

Did you try running it? If the methods complete and the JVM exits, that's a clue that it's not deadlock.

Java synchronization is reentrant. Deadlock will only occur when you're talking about locks on two or more different monitor objects.

I edited your post to move the discussion out of the code block - the lines were too long, and messed up the formatting of the page. (Inside code blocks, line breaks will not be inserted automatically.)