1 /* 2 * Copyright (C) 2007 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.CountDownLatch; 18 19 /** 20 * Make sure that a sub-thread can join the main thread. 21 */ 22 public class Main { 23 public static void main(String[] args) throws Exception { 24 Thread t; 25 CountDownLatch waitLatch = new CountDownLatch(1); 26 CountDownLatch progressLatch = new CountDownLatch(1); 27 28 t = new Thread(new JoinMainSub(Thread.currentThread(), waitLatch, progressLatch), "Joiner"); 29 System.out.print("Starting thread '" + t.getName() + "'\n"); 30 t.start(); 31 32 waitLatch.await(); 33 System.out.print("JoinMain starter returning\n"); 34 progressLatch.countDown(); 35 36 // Keep the thread alive a little longer, giving the other thread a chance to join on a 37 // live thread (though that isn't critically important for the test). 38 Thread.currentThread().sleep(500); 39 } 40 } 41 42 class JoinMainSub implements Runnable { 43 private Thread mJoinMe; 44 private CountDownLatch waitLatch; 45 private CountDownLatch progressLatch; 46 47 public JoinMainSub(Thread joinMe, CountDownLatch waitLatch, CountDownLatch progressLatch) { 48 mJoinMe = joinMe; 49 this.waitLatch = waitLatch; 50 this.progressLatch = progressLatch; 51 } 52 53 public void run() { 54 System.out.print("@ JoinMainSub running\n"); 55 56 try { 57 waitLatch.countDown(); 58 progressLatch.await(); 59 mJoinMe.join(); 60 System.out.print("@ JoinMainSub successfully joined main\n"); 61 } catch (InterruptedException ie) { 62 System.out.print("@ JoinMainSub interrupted!\n"); 63 } 64 finally { 65 System.out.print("@ JoinMainSub bailing\n"); 66 } 67 } 68 } 69
