1 /* 2 * Copyright (c) 2006, 2011, 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 6399443 27 * @summary Check for auto-shutdown and gc of singleThreadExecutors 28 * @library /test/lib 29 * @run main/othervm/timeout=1000 AutoShutdown 30 * @author Martin Buchholz 31 */ 32 33 import static java.util.concurrent.Executors.defaultThreadFactory; 34 import static java.util.concurrent.Executors.newSingleThreadExecutor; 35 36 import static java.util.concurrent.TimeUnit.MILLISECONDS; 37 38 import java.lang.ref.WeakReference; 39 import java.util.Arrays; 40 import java.util.concurrent.ConcurrentLinkedQueue; 41 import java.util.concurrent.CountDownLatch; 42 import java.util.concurrent.Executor; 43 import java.util.concurrent.TimeUnit; 44 import jdk.test.lib.Utils; 45 46 public class AutoShutdown { 47 static final long LONG_DELAY_MS = Utils.adjustTimeout(10_000); 48 49 static void await(CountDownLatch latch) throws InterruptedException { 50 if (!latch.await(LONG_DELAY_MS, MILLISECONDS)) 51 throw new AssertionError("timed out waiting for latch"); 52 } 53 54 private static void realMain(String[] args) throws Throwable { 55 final Executor[] executors = { 56 newSingleThreadExecutor(), 57 newSingleThreadExecutor(defaultThreadFactory()), 58 // TODO: should these executors also auto-shutdown? 59 //newFixedThreadPool(1), 60 //newSingleThreadScheduledExecutor(), 61 //newSingleThreadScheduledExecutor(defaultThreadFactory()), 62 }; 63 final ConcurrentLinkedQueue<WeakReference<Thread>> poolThreads 64 = new ConcurrentLinkedQueue<>(); 65 final CountDownLatch threadStarted 66 = new CountDownLatch(executors.length); 67 final CountDownLatch pleaseProceed 68 = new CountDownLatch(1); 69 Runnable task = new Runnable() { public void run() { 70 try { 71 poolThreads.add(new WeakReference<>(Thread.currentThread())); 72 threadStarted.countDown(); 73 await(pleaseProceed); 74 } catch (Throwable t) { unexpected(t); } 75 }}; 76 for (Executor executor : executors) 77 executor.execute(task); 78 await(threadStarted); 79 pleaseProceed.countDown(); 80 Arrays.fill(executors, null); // make executors unreachable 81 boolean done = false; 82 for (long timeout = 1L; !done && timeout <= 128L; timeout *= 2) { 83 System.gc(); 84 done = true; 85 for (WeakReference<Thread> ref : poolThreads) { 86 Thread thread = ref.get(); 87 if (thread != null) { 88 TimeUnit.SECONDS.timedJoin(thread, timeout); 89 if (thread.isAlive()) 90 done = false; 91 } 92 } 93 } 94 if (!done) 95 throw new AssertionError("pool threads did not terminate"); 96 } 97 98 //--------------------- Infrastructure --------------------------- 99 static volatile int passed = 0, failed = 0; 100 static void pass() {passed++;} 101 static void fail() {failed++; Thread.dumpStack();} 102 static void fail(String msg) {System.out.println(msg); fail();} 103 static void unexpected(Throwable t) {failed++; t.printStackTrace();} 104 static void equal(Object x, Object y) { 105 if (x == null ? y == null : x.equals(y)) pass(); 106 else fail(x + " not equal to " + y);} 107 public static void main(String[] args) throws Throwable { 108 try {realMain(args);} catch (Throwable t) {unexpected(t);} 109 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 110 if (failed > 0) throw new AssertionError("Some tests failed");} 111 }