Notify() from runnable

I have myThread.wait() that is in synchronzed(myThread) block. And I have Myrunner that implements runnable. I would like to tell notify() from myRunner, but it is not monitor object. Is it possible to get handle of myThread from myRunnable to make notify? Is there any other solution? Extend myRunnable from Thread and run it is not good for some reasons related on my code specific.

public class ThreadMain {
    public Thread reader;
    private class SerialReader implements Runnable {
        public void run() {
            while (true) {
                try {
                    Thread.sleep(3000);                
                    synchronized(this) {
                        System.out.println("notifying");
                        notify();
                        System.out.println("notifying done");
                    }                
                } catch (Exception e) {
                    System.out.println(e);
                }                
            }
        }
    }

    ThreadMain() {
        reader = new Thread(new SerialReader());
    }

    public static void main(String [] args) {
        ThreadMain d= new ThreadMain();    
        d.reader.start();
        synchronized(d.reader) {
            try {    
                d.reader.wait();
                System.out.println("got notify");
            } catch (Exception e) { 
                System.out.println(e);
            }    
        }        
    }
}

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Both threads should synchronize using the same object. Also, you should really not use an existing object to syncronize, but create a object to be used explicitly for synchronization, like

Object lock = new Object();

Also see https://www.securecoding.cert.org/confluence/display/java/LCK01-J.+Do+not+synchronize+on+objects+that+may+be+reused

If the lock is to be used to interact with your thread, you can put it in the thread and provide a getter for anyone to use it.

---

To notify() a wait() ing thread you much have a reference to the object it is wait() on and you must be able to acquire a lock on it. I suggest you also change a state which notifying and you check that state change in a loop when wait() ing.

The only other option is to change the code of the waiting thread.

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