/*
Based on example from "The Art of Multiprocessor Programming" by Herlihy, Maurice and Shavit, Nir and slightly modified.
*/
public class Counter {
  private int value ;
  public Counter (int c) {    // constructor
    value = c ;
  }

  // increment and return prior value
  public int getAndIncrement() {
    // start of critical section
    int temp = value ;      
    System.out.println("temp = " + temp);
    value = temp + 1 ;      
    // end of critical section
    return temp ;
  }

  // get method for the value
  public int getValue() {
    return value;
  }

  public static void main (String args[]) throws InterruptedException {
    Thread[] thread = new Thread[200] ;
    Counter counter = new Counter(0) ;    // shared by all threads

    // create threads
    for (int i = 0; i < thread.length; i++) {
      thread[i] = new Thread(new Runnable() {
        public void run() {
          int n = counter.getAndIncrement();
        }
      }) ;
    }

    // starting the threads
    for (int i = 0; i < thread.length; i++) {
      thread[i].start() ;
    }

    // waiting for threads to finish
    for (int i = 0; i < thread.length; i++) {
      thread[i].join();
    }

    System.out.println("final value of counter: "+ counter.getValue());
  }

}