public class ReadWriteLock {

    //register Reader(Thread t)
    //readLock()
    //readUnLock()
    //writeLock()
    //writeUnLock()
    // set <long> readers = new HashSet<>();
    // set <long> whoEntered = new HashSet<>();
    // set <long> whoLeft = new HashSet<>();
    //boolean writeWait = false;

    //public synchronized  void registerReader(Thread t) {
//
// readers.add(t.getId());
// }
    //public synchronized  void unRegisterReader(Thread t) {
//
// readers.remove(t.getId());
// }


    //public synchronized void lockRead() throws inter...
    //long id = getId();
    //while(whoEntered.contains(id) || writerWait == false) {wait();}
    //whoEntered.add(id);


    //public synchronized void unLockRead()
    // {long id = getId();
    //whoLeft.add(id);
    //if (whoLeft.containsAll(readers) &&
    // whoLeft.equals(whoEntered)) { writerWait = false;}
    // notifyAll();


    //public synchronized void lockWrite() throw inter {...
    // while(writerWait) {wait();}
    // writeWait=true;}


    //public synchronized void unLockWrite() {...
    // whoEntered.clear();
    // whoLeft.clear();
    // notifyAll();}
    //private long getId() {return Thread.currentThread().getId(); }
}