--- /dev/null Sat Feb 22 16:11:52 2014 +++ new/test/java/lang/annotation/AnnotationType/AnnotationTypeDeadlockTest.java Sat Feb 22 16:11:49 2014 @@ -0,0 +1,101 @@ +/* + * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/* + * @test + * @bug 7122142 + * @summary Test deadlock situation when recursive annotations are parsed + */ + +import java.lang.annotation.Retention; +import java.lang.management.ManagementFactory; +import java.lang.management.ThreadInfo; +import java.lang.management.ThreadMXBean; +import java.util.concurrent.CountDownLatch; +import java.util.concurrent.atomic.AtomicInteger; + +import static java.lang.annotation.RetentionPolicy.RUNTIME; + +public class AnnotationTypeDeadlockTest { + + @Retention(RUNTIME) + @AnnB + public @interface AnnA { + } + + @Retention(RUNTIME) + @AnnA + public @interface AnnB { + } + + static class Task extends Thread { + final CountDownLatch prepareLatch; + final AtomicInteger goLatch; + final Class clazz; + + Task(CountDownLatch prepareLatch, AtomicInteger goLatch, Class clazz) { + super(clazz.getSimpleName()); + setDaemon(true); // in case it deadlocks + this.prepareLatch = prepareLatch; + this.goLatch = goLatch; + this.clazz = clazz; + } + + @Override + public void run() { + prepareLatch.countDown(); // notify we are prepared + while (goLatch.get() > 0); // spin-wait before go + clazz.getDeclaredAnnotations(); + } + } + + public static void main(String[] args) throws Exception { + CountDownLatch prepareLatch = new CountDownLatch(2); + AtomicInteger goLatch = new AtomicInteger(1); + Task taskA = new Task(prepareLatch, goLatch, AnnA.class); + Task taskB = new Task(prepareLatch, goLatch, AnnB.class); + taskA.start(); + taskB.start(); + // wait until both threads start-up + prepareLatch.await(); + // let them go + goLatch.set(0); + // obtain ThreadMXBean + ThreadMXBean threadBean = ManagementFactory.getThreadMXBean(); + // wait for threads to finish or dead-lock + while (taskA.isAlive() || taskB.isAlive()) { + // attempt to join threads + taskA.join(500L); + taskB.join(500L); + // detect dead-lock + long[] deadlockedIds = threadBean.findMonitorDeadlockedThreads(); + if (deadlockedIds != null && deadlockedIds.length > 0) { + StringBuilder sb = new StringBuilder("deadlock detected:\n\n"); + for (ThreadInfo ti : threadBean.getThreadInfo(deadlockedIds, Integer.MAX_VALUE)) { + sb.append(ti); + } + throw new IllegalStateException(sb.toString()); + } + } + } +}