trunk/libjava/testsuite/libjava.lang/Thread_Monitor.java

   1 // Test that monitor locks work and are recursive.
   2
   3 class T implements Runnable
   4 {
   5   public int count = 0;
   6   Counter c;
   7
   8   public T (Counter c)
   9   {
  10     this.c = c;
  11   }
  12
  13   public void run()
  14   {
  15     while (true)
  16       {
  17         // NOTE: double-synchronization here.
  18         synchronized (c)
  19         {
  20           if (c.getCount() <= 100000)
  21             count++;
  22           else
  23             break;
  24         }
  25       }
  26   }
  27 }
  28
  29 class Counter
  30 {
  31   int i = 0;
  32   public synchronized int getCount ()
  33   {
  34     return ++i;
  35   }
  36 }
  37
  38 public class Thread_Monitor
  39 {
  40   public static void main(String args[])
  41   {
  42     Counter c = new Counter();
  43     T t1 = new T(c);
  44     T t2 = new T(c);
  45
  46     Thread th1 = new Thread(t1);
  47     Thread th2 = new Thread(t2);
  48     th1.start();
  49     th2.start();
  50     try
  51     {
  52       th1.join();
  53       th2.join();
  54     }
  55     catch (InterruptedException x)
  56     {
  57       System.out.println("failed: Interrupted");
  58     }
  59     if (t1.count + t2.count == 100000)
  60       System.out.println ("ok");
  61     else
  62       System.out.println ("failed: total count incorrect");
  63   }
  64 }