package org.apidesign.deadlock;

 public final class SynchronizedFieldsInternally {

     // BEGIN: deadlock.ownLock

     private final Object LOCK = new Object();

     private int counter;

     private int getCounter() {

         assert Thread.holdsLock(LOCK);

         return counter;

     } 

     private void setCounter(int c) {

         assert Thread.holdsLock(LOCK);

         counter = c;

     }

     // END: deadlock.ownLock

     public void increment() {

         synchronized (LOCK) {

             setCounter(getCounter() + 1);

         }

     }

     public void unsafeDecrement() {

         setCounter(getCounter() - 1);

     }

 }