1 /* 2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 /* 25 * @test 26 * @bug 6332435 27 * @summary Basic tests for CountDownLatch 28 * @author Seetharam Avadhanam, Martin Buchholz 29 */ 30 31 import java.util.concurrent.CountDownLatch; 32 import java.util.concurrent.TimeUnit; 33 import java.util.concurrent.atomic.AtomicInteger; 34 35 interface AwaiterFactory { getAwaiter()36 Awaiter getAwaiter(); 37 } 38 39 abstract class Awaiter extends Thread { 40 private volatile Throwable result = null; result(Throwable result)41 protected void result(Throwable result) { this.result = result; } result()42 public Throwable result() { return this.result; } 43 } 44 45 public class Basic { 46 toTheStartingGate(CountDownLatch gate)47 private void toTheStartingGate(CountDownLatch gate) { 48 try { 49 gate.await(); 50 } 51 catch (Throwable t) { fail(t); } 52 } 53 awaiter(final CountDownLatch latch, final CountDownLatch gate)54 private Awaiter awaiter(final CountDownLatch latch, 55 final CountDownLatch gate) { 56 return new Awaiter() { public void run() { 57 System.out.println("without millis: " + latch.toString()); 58 gate.countDown(); 59 60 try { 61 latch.await(); 62 System.out.println("without millis - ComingOut"); 63 } 64 catch (Throwable result) { result(result); }}}; 65 } 66 67 private Awaiter awaiter(final CountDownLatch latch, 68 final CountDownLatch gate, 69 final long millis) { 70 return new Awaiter() { public void run() { 71 System.out.println("with millis: "+latch.toString()); 72 gate.countDown(); 73 74 try { 75 latch.await(millis, TimeUnit.MILLISECONDS); 76 System.out.println("with millis - ComingOut"); 77 } 78 catch (Throwable result) { result(result); }}}; 79 } 80 81 private AwaiterFactory awaiterFactories(final CountDownLatch latch, 82 final CountDownLatch gate, 83 final int i) { 84 if (i == 1) 85 return new AwaiterFactory() { public Awaiter getAwaiter() { 86 return awaiter(latch, gate); }}; 87 88 return new AwaiterFactory() { public Awaiter getAwaiter() { 89 return awaiter(latch, gate, 10000); }}; 90 } 91 92 //---------------------------------------------------------------- 93 // Normal use 94 //---------------------------------------------------------------- 95 public static void normalUse() throws Throwable { 96 int count = 0; 97 Basic test = new Basic(); 98 CountDownLatch latch = new CountDownLatch(3); 99 Awaiter[] a = new Awaiter[12]; 100 101 for (int i = 0; i < 3; i++) { 102 CountDownLatch gate = new CountDownLatch(4); 103 AwaiterFactory factory1 = test.awaiterFactories(latch, gate, 1); 104 AwaiterFactory factory2 = test.awaiterFactories(latch, gate, 0); 105 a[count] = factory1.getAwaiter(); a[count++].start(); 106 a[count] = factory1.getAwaiter(); a[count++].start(); 107 a[count] = factory2.getAwaiter(); a[count++].start(); 108 a[count] = factory2.getAwaiter(); a[count++].start(); 109 test.toTheStartingGate(gate); 110 System.out.println("Main Thread: " + latch.toString()); 111 latch.countDown(); 112 checkCount(latch, 2-i); 113 } 114 for (int i = 0; i < 12; i++) 115 a[i].join(); 116 117 for (int i = 0; i < 12; i++) 118 checkResult(a[i], null); 119 } 120 121 //---------------------------------------------------------------- 122 // One thread interrupted 123 //---------------------------------------------------------------- 124 public static void threadInterrupted() throws Throwable { 125 int count = 0; 126 Basic test = new Basic(); 127 CountDownLatch latch = new CountDownLatch(3); 128 Awaiter[] a = new Awaiter[12]; 129 130 for (int i = 0; i < 3; i++) { 131 CountDownLatch gate = new CountDownLatch(4); 132 AwaiterFactory factory1 = test.awaiterFactories(latch, gate, 1); 133 AwaiterFactory factory2 = test.awaiterFactories(latch, gate, 0); 134 a[count] = factory1.getAwaiter(); a[count++].start(); 135 a[count] = factory1.getAwaiter(); a[count++].start(); 136 a[count] = factory2.getAwaiter(); a[count++].start(); 137 a[count] = factory2.getAwaiter(); a[count++].start(); 138 a[count-1].interrupt(); 139 test.toTheStartingGate(gate); 140 System.out.println("Main Thread: " + latch.toString()); 141 latch.countDown(); 142 checkCount(latch, 2-i); 143 } 144 for (int i = 0; i < 12; i++) 145 a[i].join(); 146 147 for (int i = 0; i < 12; i++) 148 checkResult(a[i], 149 (i % 4) == 3 ? InterruptedException.class : null); 150 } 151 152 //---------------------------------------------------------------- 153 // One thread timed out 154 //---------------------------------------------------------------- 155 public static void timeOut() throws Throwable { 156 int count =0; 157 Basic test = new Basic(); 158 CountDownLatch latch = new CountDownLatch(3); 159 Awaiter[] a = new Awaiter[12]; 160 161 long[] timeout = { 0L, 5L, 10L }; 162 163 for (int i = 0; i < 3; i++) { 164 CountDownLatch gate = new CountDownLatch(4); 165 AwaiterFactory factory1 = test.awaiterFactories(latch, gate, 1); 166 AwaiterFactory factory2 = test.awaiterFactories(latch, gate, 0); 167 a[count] = test.awaiter(latch, gate, timeout[i]); a[count++].start(); 168 a[count] = factory1.getAwaiter(); a[count++].start(); 169 a[count] = factory2.getAwaiter(); a[count++].start(); 170 a[count] = factory2.getAwaiter(); a[count++].start(); 171 test.toTheStartingGate(gate); 172 System.out.println("Main Thread: " + latch.toString()); 173 latch.countDown(); 174 checkCount(latch, 2-i); 175 } 176 for (int i = 0; i < 12; i++) 177 a[i].join(); 178 179 for (int i = 0; i < 12; i++) 180 checkResult(a[i], null); 181 } 182 183 public static void main(String[] args) throws Throwable { 184 normalUse(); 185 threadInterrupted(); 186 timeOut(); 187 if (failures.get() > 0L) 188 throw new AssertionError(failures.get() + " failures"); 189 } 190 191 private static final AtomicInteger failures = new AtomicInteger(0); 192 193 private static void fail(String msg) { 194 fail(new AssertionError(msg)); 195 } 196 197 private static void fail(Throwable t) { 198 t.printStackTrace(); 199 failures.getAndIncrement(); 200 } 201 202 private static void checkCount(CountDownLatch b, int expected) { 203 if (b.getCount() != expected) 204 fail("Count = " + b.getCount() + 205 ", expected = " + expected); 206 } 207 208 private static void checkResult(Awaiter a, Class c) { 209 Throwable t = a.result(); 210 if (! ((t == null && c == null) || c.isInstance(t))) { 211 System.out.println("Mismatch: " + t + ", " + c.getName()); 212 failures.getAndIncrement(); 213 } 214 } 215 } 216