1/*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17import java.util.concurrent.*;
18import java.util.concurrent.atomic.AtomicLong;
19
20/**
21 * Test for Jit regressions.
22 */
23public class Main {
24    public static void main(String args[]) throws Exception {
25        b17689750TestVolatile();
26        b17689750TestMonitor();
27    }
28
29    static void b17689750TestVolatile() {
30        final B17689750TestVolatile test = new B17689750TestVolatile();
31        new Thread() {
32            public void run() {
33                test.thread1();
34            }
35        }.start();
36        try {
37            test.thread2();
38        } catch (NullPointerException expected) {
39            System.out.println("b17689750TestVolatile passed.");
40        }
41    }
42
43    static void b17689750TestMonitor() {
44      final B17689750TestMonitor test = new B17689750TestMonitor();
45      new Thread() {
46        public void run() {
47          test.thread1();
48        }
49      }.start();
50      try {
51        test.thread2();
52      } catch (NullPointerException expected) {
53        System.out.println("b17689750TestMonitor passed.");
54      }
55    }
56}
57
58class B17689750TestVolatile {
59  private volatile int state = 0;
60  private int[] values = { 42 };
61
62  void thread1() {
63    while (state != 1) { }  // Busy loop.
64    values = null;
65    state = 2;
66  }
67
68  void thread2() {
69    int[] vs1 = values;
70    state = 1;
71    while (state != 2) { }  // Busy loop.
72    int[] vs2 = values;
73    int v1 = vs1[0];
74    int v2 = vs2[0];
75    System.out.println("b17689750TestVolatile failed: " + v1 + ", " + v2);
76  }
77}
78
79class B17689750TestMonitor {
80  private int state = 0;
81  private Object lock = new Object();
82  private int[] values = { 42 };
83
84  void thread1() {
85    int s;
86    do {
87      synchronized (lock) {
88        s = state;
89      }
90    } while (s != 1);  // Busy loop.
91
92    synchronized (lock) {
93      values = null;
94      state = 2;
95    }
96  }
97
98  void thread2() {
99    int[] vs1;
100    synchronized (lock) {
101      vs1 = values;
102      state = 1;
103    }
104
105    int s;
106    do {
107      synchronized (lock) {
108        s = state;
109      }
110    } while (s != 2);  // Busy loop.
111
112    int[] vs2 = values;
113    int v1 = vs1[0];
114    int v2 = vs2[0];
115    System.out.println("b17689750TestMonitor failed: " + v1 + ", " + v2);
116  }
117}
118