| /* |
| * Copyright (c) 2013, 2014, 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 7038914 8016341 |
| * @summary Verify that the reference handler does not die after an OOME allocating the InterruptedException object |
| * @run main/othervm -XX:-UseGCOverheadLimit -Xmx24M -XX:-UseTLAB OOMEInReferenceHandler |
| * @author peter.levart@gmail.com |
| * @key intermittent |
| */ |
| |
| import java.lang.ref.*; |
| |
| public class OOMEInReferenceHandler { |
| static Object[] fillHeap() { |
| Object[] first = null, last = null; |
| int size = 1 << 20; |
| while (size > 0) { |
| try { |
| Object[] array = new Object[size]; |
| if (first == null) { |
| first = array; |
| } else { |
| last[0] = array; |
| } |
| last = array; |
| } catch (OutOfMemoryError oome) { |
| size = size >>> 1; |
| } |
| } |
| return first; |
| } |
| |
| public static void main(String[] args) throws Exception { |
| // preinitialize the InterruptedException class so that the reference handler |
| // does not die due to OOME when loading the class if it is the first use |
| InterruptedException ie = new InterruptedException("dummy"); |
| |
| ThreadGroup tg = Thread.currentThread().getThreadGroup(); |
| for ( |
| ThreadGroup tgn = tg; |
| tgn != null; |
| tg = tgn, tgn = tg.getParent() |
| ) |
| ; |
| |
| Thread[] threads = new Thread[tg.activeCount()]; |
| Thread referenceHandlerThread = null; |
| int n = tg.enumerate(threads); |
| for (int i = 0; i < n; i++) { |
| if ("Reference Handler".equals(threads[i].getName())) { |
| referenceHandlerThread = threads[i]; |
| } |
| } |
| |
| if (referenceHandlerThread == null) { |
| throw new IllegalStateException("Couldn't find Reference Handler thread."); |
| } |
| |
| ReferenceQueue<Object> refQueue = new ReferenceQueue<>(); |
| Object referent = new Object(); |
| WeakReference<Object> weakRef = new WeakReference<>(referent, refQueue); |
| |
| Object waste = fillHeap(); |
| |
| referenceHandlerThread.interrupt(); |
| |
| // allow referenceHandlerThread some time to throw OOME |
| Thread.sleep(500L); |
| |
| // release waste & referent |
| waste = null; |
| referent = null; |
| |
| // wait at most 10 seconds for success or failure |
| for (int i = 0; i < 20; i++) { |
| if (refQueue.poll() != null) { |
| // Reference Handler thread still working -> success |
| return; |
| } |
| System.gc(); |
| Thread.sleep(500L); // wait a little to allow GC to do it's work before allocating objects |
| if (!referenceHandlerThread.isAlive()) { |
| // Reference Handler thread died -> failure |
| throw new Exception("Reference Handler thread died."); |
| } |
| } |
| |
| // no sure answer after 10 seconds |
| throw new IllegalStateException("Reference Handler thread stuck. weakRef.get(): " + weakRef.get()); |
| } |
| } |