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 package org.apidesign.privileged.api;

 import java.util.concurrent.locks.Lock;

 import java.util.concurrent.locks.ReentrantLock;

 /**

  *

  * @author Jaroslav Tulach <jaroslav.tulach@netbeans.org>

  */

 // BEGIN: mutex.api

 public final class Mutex {

     Lock lock = new ReentrantLock();

     public Mutex() {

     }

     public void withLock(Runnable r) {

         try {

             lock.lock();

             r.run();

         } finally {

             lock.unlock();

         }

     }

 // FINISH: mutex.api

 // BEGIN: mutex.privileged.api

     public Mutex(Privileged privileged) {

         if (privileged.mutex != null) {

             throw new IllegalStateException();

         }

         privileged.mutex = this;

     }

     public static final class Privileged {

         private Mutex mutex;

         public void lock() {

             mutex.lock.lock();

         }

         public void unlock() {

             mutex.lock.unlock();

         }

     }

 // END: mutex.privileged.api

 }