Wed, 22 Jan 2014 12:37:28 -0800
Added tag jdk8u5-b05 for changeset b90de55aca30
kvn@4002 | 1 | /* |
kvn@4449 | 2 | * Copyright (c) 2012, 2013, Oracle and/or its affiliates. All rights reserved. |
kvn@4002 | 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
kvn@4002 | 4 | * |
kvn@4002 | 5 | * This code is free software; you can redistribute it and/or modify it |
kvn@4002 | 6 | * under the terms of the GNU General Public License version 2 only, as |
kvn@4002 | 7 | * published by the Free Software Foundation. |
kvn@4002 | 8 | * |
kvn@4002 | 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
kvn@4002 | 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
kvn@4002 | 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
kvn@4002 | 12 | * version 2 for more details (a copy is included in the LICENSE file that |
kvn@4002 | 13 | * accompanied this code). |
kvn@4002 | 14 | * |
kvn@4002 | 15 | * You should have received a copy of the GNU General Public License version |
kvn@4002 | 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
kvn@4002 | 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
kvn@4002 | 18 | * |
kvn@4002 | 19 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
kvn@4002 | 20 | * or visit www.oracle.com if you need additional information or have any |
kvn@4002 | 21 | * questions. |
kvn@4002 | 22 | * |
kvn@4002 | 23 | */ |
kvn@4002 | 24 | |
kvn@4002 | 25 | /* |
kvn@4449 | 26 | * @test |
kvn@4449 | 27 | * @bug 7190310 |
kvn@4449 | 28 | * @summary Inlining WeakReference.get(), and hoisting $referent may lead to non-terminating loops |
kvn@4449 | 29 | * @run main/othervm/timeout=600 -Xbatch Test7190310 |
kvn@4449 | 30 | */ |
kvn@4449 | 31 | |
kvn@4449 | 32 | /* |
kvn@4449 | 33 | * Note bug exhibits as infinite loop, timeout is helpful. |
kvn@4449 | 34 | * It should normally finish pretty quickly, but on some especially slow machines |
kvn@4449 | 35 | * it may not. The companion _unsafe test lacks a timeout, but that is okay. |
kvn@4002 | 36 | */ |
kvn@4002 | 37 | |
kvn@4002 | 38 | import java.lang.ref.*; |
kvn@4002 | 39 | |
kvn@4002 | 40 | public class Test7190310 { |
kvn@4002 | 41 | private static Object str = new Object() { |
kvn@4002 | 42 | public String toString() { |
kvn@4002 | 43 | return "The Object"; |
kvn@4002 | 44 | } |
kvn@4002 | 45 | |
kvn@4002 | 46 | protected void finalize() throws Throwable { |
kvn@4002 | 47 | System.out.println("The Object is being finalized"); |
kvn@4002 | 48 | super.finalize(); |
kvn@4002 | 49 | } |
kvn@4002 | 50 | }; |
kvn@4002 | 51 | private final static ReferenceQueue<Object> rq = |
kvn@4002 | 52 | new ReferenceQueue<Object>(); |
kvn@4002 | 53 | private final static WeakReference<Object> wr = |
kvn@4002 | 54 | new WeakReference<Object>(str, rq); |
kvn@4002 | 55 | |
kvn@4002 | 56 | public static void main(String[] args) |
kvn@4002 | 57 | throws InterruptedException { |
kvn@4002 | 58 | Thread reader = new Thread() { |
kvn@4002 | 59 | public void run() { |
kvn@4002 | 60 | while (wr.get() != null) { |
kvn@4002 | 61 | } |
kvn@4002 | 62 | System.out.println("wr.get() returned null"); |
kvn@4002 | 63 | } |
kvn@4002 | 64 | }; |
kvn@4002 | 65 | |
kvn@4002 | 66 | Thread queueReader = new Thread() { |
kvn@4002 | 67 | public void run() { |
kvn@4002 | 68 | try { |
kvn@4002 | 69 | Reference<? extends Object> ref = rq.remove(); |
kvn@4002 | 70 | System.out.println(ref); |
kvn@4002 | 71 | System.out.println("queueReader returned, ref==wr is " |
kvn@4002 | 72 | + (ref == wr)); |
kvn@4002 | 73 | } catch (InterruptedException e) { |
kvn@4002 | 74 | System.err.println("Sleep interrupted - exiting"); |
kvn@4002 | 75 | } |
kvn@4002 | 76 | } |
kvn@4002 | 77 | }; |
kvn@4002 | 78 | |
kvn@4002 | 79 | reader.start(); |
kvn@4002 | 80 | queueReader.start(); |
kvn@4002 | 81 | |
kvn@4002 | 82 | Thread.sleep(1000); |
kvn@4002 | 83 | str = null; |
kvn@4002 | 84 | System.gc(); |
kvn@4002 | 85 | } |
kvn@4002 | 86 | } |
kvn@4002 | 87 |