Hi all,

I have written a program which successfully uses threads to run an iteration
whilst at the same time responding to input from a simple GUI. However i
need to rewrite it without using suspend() and resume() to avoid deadlocks.
The 2 threads start fine, and i can use a button event in the GUI thread to
pause the iteration thread using wait(). However whatever i try i cannot
make the button rewake the iteration thread using notify().

I'll paste the critical parts of the code below, any help very much
appeciated here!

Thanks

Mark

/////////////////////////////////  DECLARING THREAD & BOOLEAN

 private Thread iteration_thread = new Thread(this);

 private volatile boolean threadSuspended;

////////////////////////////////////////////////////////////////  TOGGLE
BUTTON

       toggleButton = new Button("Toggle");
       toggleButton.addActionListener(new ActionListener()
        {
          public synchronized void actionPerformed(ActionEvent e)
           {
             if(!iteration_thread.isAlive()) iteration_thread.start();
             else
              {
                threadSuspended = !threadSuspended;
                if (!threadSuspended)
                 {
                   notify();
                 }
              }
           }
         });

/////////////////////////////////////////////////  THE THREAD'S RUN METHOD
   public void run()
    {
       while (true)
        {
           try
            {
              Thread.currentThread().sleep(500);

              synchronized(this)
               {
                 while(threadSuspended)
                  {
                    wait();
                  }
               }
              System.out.println("here");     // what to do when not paused
             }
           catch(InterruptedException e)
            {

            }

       }
   }