1 /* 2 * Copyright (C) 2010 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 18 /* 19 * Entry point and tests that are expected to succeed. 20 */ 21 public class Main { 22 /** 23 * Drives tests. 24 */ 25 public static void main(String[] args) { 26 Main m = new Main(); 27 28 m.recursiveSync(0); 29 30 m.nestedMayThrow(false); 31 try { 32 m.nestedMayThrow(true); 33 System.err.println("nestedThrow(true) did not throw"); 34 } catch (MyException me) {} 35 System.out.println("nestedMayThrow ok"); 36 37 m.constantLock(); 38 System.out.println("constantLock ok"); 39 40 m.notExcessiveNesting(); 41 if (false) { // TODO: remove when verification is turned on 42 try { 43 TooDeep.excessiveNesting(); 44 System.err.println("excessiveNesting did not throw"); 45 } catch (VerifyError ve) {} 46 } 47 System.out.println("excessiveNesting ok"); 48 49 m.notNested(); 50 System.out.println("notNested ok"); 51 52 Object obj1 = new Object(); 53 Object obj2 = new Object(); 54 55 m.twoPath(obj1, obj2, 0); 56 System.out.println("twoPath ok"); 57 58 m.triplet(obj1, obj2, 0); 59 System.out.println("triplet ok"); 60 } 61 62 /** 63 * Recursive synchronized method. 64 */ 65 synchronized void recursiveSync(int iter) { 66 if (iter < 40) { 67 recursiveSync(iter+1); 68 } else { 69 System.out.println("recursiveSync ok"); 70 } 71 } 72 73 /** 74 * Tests simple nesting, with and without a throw. 75 */ 76 void nestedMayThrow(boolean doThrow) { 77 synchronized (this) { 78 synchronized (Main.class) { 79 synchronized (new Object()) { 80 synchronized(Class.class) { 81 if (doThrow) { 82 throw new MyException(); 83 } 84 } 85 } 86 } 87 } 88 } 89 90 /** 91 * Exercises bug 3215458. 92 */ 93 void constantLock() { 94 Class thing = Thread.class; 95 synchronized (Thread.class) {} 96 } 97 98 /** 99 * Confirms that we can have 32 nested monitors on one method. 100 */ 101 void notExcessiveNesting() { 102 synchronized (this) { // 1 103 synchronized (this) { // 2 104 synchronized (this) { // 3 105 synchronized (this) { // 4 106 synchronized (this) { // 5 107 synchronized (this) { // 6 108 synchronized (this) { // 7 109 synchronized (this) { // 8 110 synchronized (this) { // 9 111 synchronized (this) { // 10 112 synchronized (this) { // 11 113 synchronized (this) { // 12 114 synchronized (this) { // 13 115 synchronized (this) { // 14 116 synchronized (this) { // 15 117 synchronized (this) { // 16 118 synchronized (this) { // 17 119 synchronized (this) { // 18 120 synchronized (this) { // 19 121 synchronized (this) { // 20 122 synchronized (this) { // 21 123 synchronized (this) { // 22 124 synchronized (this) { // 23 125 synchronized (this) { // 24 126 synchronized (this) { // 25 127 synchronized (this) { // 26 128 synchronized (this) { // 27 129 synchronized (this) { // 28 130 synchronized (this) { // 29 131 synchronized (this) { // 30 132 synchronized (this) { // 31 133 synchronized (this) { // 32 134 }}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}} 135 } 136 137 /** 138 * Confirms that we can have more than 32 non-nested monitors in one 139 * method. 140 */ 141 void notNested() { 142 synchronized (this) {} // 1 143 synchronized (this) {} // 2 144 synchronized (this) {} // 3 145 synchronized (this) {} // 4 146 synchronized (this) {} // 5 147 synchronized (this) {} // 6 148 synchronized (this) {} // 7 149 synchronized (this) {} // 8 150 synchronized (this) {} // 9 151 synchronized (this) {} // 10 152 synchronized (this) {} // 11 153 synchronized (this) {} // 12 154 synchronized (this) {} // 13 155 synchronized (this) {} // 14 156 synchronized (this) {} // 15 157 synchronized (this) {} // 16 158 synchronized (this) {} // 17 159 synchronized (this) {} // 18 160 synchronized (this) {} // 19 161 synchronized (this) {} // 20 162 synchronized (this) {} // 21 163 synchronized (this) {} // 22 164 synchronized (this) {} // 23 165 synchronized (this) {} // 24 166 synchronized (this) {} // 25 167 synchronized (this) {} // 26 168 synchronized (this) {} // 27 169 synchronized (this) {} // 28 170 synchronized (this) {} // 29 171 synchronized (this) {} // 30 172 synchronized (this) {} // 31 173 synchronized (this) {} // 32 174 synchronized (this) {} // 33 175 synchronized (this) {} // 34 176 } 177 178 /* does nothing but ensure that the compiler doesn't discard an object */ 179 private void doNothing(Object obj) {} 180 181 /** 182 * Conditionally uses one of the synchronized objects. 183 */ 184 public void twoPath(Object obj1, Object obj2, int x) { 185 Object localObj; 186 187 synchronized (obj1) { 188 synchronized(obj2) { 189 if (x == 0) { 190 localObj = obj2; 191 } else { 192 localObj = obj1; 193 } 194 } 195 } 196 197 doNothing(localObj); 198 } 199 200 /** 201 * Lock the monitor two or three times, and make use of the locked or 202 * unlocked object. 203 */ 204 public void triplet(Object obj1, Object obj2, int x) { 205 Object localObj; 206 207 synchronized (obj1) { 208 synchronized(obj1) { 209 if (x == 0) { 210 synchronized(obj1) { 211 localObj = obj2; 212 } 213 } else { 214 localObj = obj1; 215 } 216 } 217 } 218 219 doNothing(localObj); 220 } 221 } 222
