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 17 import java.util.concurrent.*; 18 import java.util.concurrent.atomic.AtomicLong; 19 20 /** 21 * Test for Jit regressions. 22 */ 23 public class Main { main(String args[])24 public static void main(String args[]) throws Exception { 25 b17689750TestVolatile(); 26 b17689750TestMonitor(); 27 } 28 b17689750TestVolatile()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 b17689750TestMonitor()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 58 class B17689750TestVolatile { 59 private volatile int state = 0; 60 private int[] values = { 42 }; 61 thread1()62 void thread1() { 63 while (state != 1) { } // Busy loop. 64 values = null; 65 state = 2; 66 } 67 thread2()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 79 class B17689750TestMonitor { 80 private int state = 0; 81 private Object lock = new Object(); 82 private int[] values = { 42 }; 83 thread1()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 thread2()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