// A simple producer-comsumer skeleton using Java threads.
//
// Operating Systems, Spring 2012

import java.util.concurrent.SynchronousQueue;


class P 
implements Runnable

  P(SynchronousQueue<Widget> q)
    // blah blah blah
    this.q = q

  public void run()
    while (true)
      Widget w = null
      // blah blah blah
      try { q.put(w); }
      catch (InterruptedException e)
	// blah blah blah

  private SynchronousQueue<Widget> q


class C
implements Runnable

  C(SynchronousQueue<Widget> q)
    // blah blah blah
    this.q = q

  public void run()
    while (true)
      Widget w = null
      try { w = q.take(); }
      catch (InterruptedException e)
	// blah blah blah
      // blah blah blah

  private SynchronousQueue<Widget> q


class Widget
  // blah blah blah


class Driver
  public static void main(String args[])

    SynchronousQueue<Widget> q = new SynchronousQueue<Widget>()
    Thread p = new Thread(new P(q))
    Thread c = new Thread(new C(q))

    p.start()
    c.start()
    try
      p.join()
      c.join()
    catch (InterruptedException e)
      // blah blah blah