1/* 2 * Copyright (c) 2007, 2014, 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 6523756 27 * @summary Race task submission against shutdownNow 28 * @author Martin Buchholz 29 */ 30 31// For extra chances to detect shutdownNow vs. execute races, 32// crank up the iterations to, say 1<<22 and 33// add a call to Thread.yield() before the call to t.start() 34// in ThreadPoolExecutor.addWorker. 35 36import java.util.concurrent.ArrayBlockingQueue; 37import java.util.concurrent.RejectedExecutionException; 38import java.util.concurrent.ThreadPoolExecutor; 39import java.util.concurrent.TimeUnit; 40 41public class ShutdownNowExecuteRace { 42 static volatile boolean quit = false; 43 static volatile ThreadPoolExecutor pool = null; 44 45 static final Runnable sleeper = new Runnable() { public void run() { 46 final long ONE_HOUR = 1000L * 60L * 60L; 47 try { Thread.sleep(ONE_HOUR); } 48 catch (InterruptedException ie) {} 49 catch (Throwable t) { unexpected(t); }}}; 50 51 static void realMain(String[] args) throws Throwable { 52 final int iterations = 1 << 8; 53 Thread thread = new Thread() { public void run() { 54 while (! quit) { 55 ThreadPoolExecutor pool = ShutdownNowExecuteRace.pool; 56 if (pool != null) 57 try { pool.execute(sleeper); } 58 catch (RejectedExecutionException e) {/* OK */} 59 catch (Throwable t) { unexpected(t); }}}}; 60 thread.start(); 61 for (int i = 0; i < iterations; i++) { 62 pool = new ThreadPoolExecutor( 63 10, 10, 3L, TimeUnit.DAYS, 64 new ArrayBlockingQueue<Runnable>(10)); 65 pool.shutdownNow(); 66 check(pool.awaitTermination(3L, TimeUnit.MINUTES)); 67 } 68 quit = true; 69 thread.join(); 70 } 71 72 //--------------------- Infrastructure --------------------------- 73 static volatile int passed = 0, failed = 0; 74 static void pass() {passed++;} 75 static void fail() {failed++; Thread.dumpStack();} 76 static void fail(String msg) {System.out.println(msg); fail();} 77 static void unexpected(Throwable t) {failed++; t.printStackTrace();} 78 static void check(boolean cond) {if (cond) pass(); else fail();} 79 static void equal(Object x, Object y) { 80 if (x == null ? y == null : x.equals(y)) pass(); 81 else fail(x + " not equal to " + y);} 82 public static void main(String[] args) throws Throwable { 83 try {realMain(args);} catch (Throwable t) {unexpected(t);} 84 System.out.printf("%nPassed = %d, failed = %d%n%n", passed, failed); 85 if (failed > 0) throw new AssertionError("Some tests failed");} 86 private abstract static class CheckedThread extends Thread { 87 abstract void realRun() throws Throwable; 88 public void run() { 89 try {realRun();} catch (Throwable t) {unexpected(t);}}} 90} 91