summaryrefslogtreecommitdiff
path: root/libjava/testsuite/libjava.lang/Thread_Wait_2.java
blob: 7ee51726c29b9978aa2087bed9378d2196c2c2dc (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
// Create many threads waiting on a monitor. Interrupt some of them. Do the 
// others wake up correctly with notify() and/or notifyAll()?

import java.util.Vector;

class Waiter extends Thread
{
  Object monitor;
  int thread_num;
  boolean interrupted = false;
  boolean notified = false;

  Waiter (Object monitor, int thread_num)
  {
    this.monitor = monitor;
    this.thread_num = thread_num;
  }  
  
  public void run()
  {
    synchronized (monitor)
      {
	try
	{
	  monitor.wait();
	  notified = true;
	}
	catch (InterruptedException x)
	{
	  interrupted = true;
	}
      }
    
  }
}

public class Thread_Wait_2
{
  static Vector threads;
  static Object monitor = new Object();
  
  static final int NUM_THREADS = 10;
  
  public static void main(String args[])
  {
    
    
    try
    {
      makeThreads ();
      
      Thread.sleep(250);
      
      // Interrupt a few threads...
      Waiter i1 = (Waiter) threads.elementAt(3);
      Waiter i2 = (Waiter) threads.elementAt(4);
      Waiter i3 = (Waiter) threads.elementAt(9);
      i1.interrupt();
      i2.interrupt();
      i3.interrupt();
      
      // Call notify the exact number of times required to wake the remaining
      // threads.
      synchronized (monitor)
      {
	for (int i=0; i < NUM_THREADS -3 ; i++)
	{
	  monitor.notify ();
	}
      }
      
      joinAll();
      printStatus();
      
      // Repeat all the above, but use notifyAll() instead.
      makeThreads();

      Thread.sleep(250);
      
      // Interrupt a few threads...
      i1 = (Waiter) threads.elementAt(0);
      i2 = (Waiter) threads.elementAt(1);
      i3 = (Waiter) threads.elementAt(9);
      i1.interrupt();
      i2.interrupt();
      i3.interrupt();
      
      // Call notifyAll to wake the remaining threads.
      synchronized (monitor)
      {
        monitor.notifyAll ();
      }

      joinAll();
      printStatus();

    }
    catch (InterruptedException x)
    {
      System.out.println (x);
    }


  }
  
  static void makeThreads()
  {
    threads = new Vector(NUM_THREADS);
    
    for (int i=0; i < NUM_THREADS; i++)
      {
	Waiter w = new Waiter(monitor, i);
	w.start();
	threads.addElement(w);
      }
  }
  
  static void joinAll()
  {
    try
    {
      for (int i=0; i < threads.size(); i++)
	{
          Thread t = (Thread) threads.elementAt(i);
	  t.join();
	}
    }
    catch (InterruptedException x) {}
  }
  
  static void printStatus()
  {
    for (int i=0; i < threads.size(); i++)
      {
        Waiter w = (Waiter) threads.elementAt(i);
	if (w.interrupted)
	  System.out.println (i + " interrupted.");
	if (w.notified)
	  System.out.println (i + " notified.");
      }
  }
  
}