96 lines
3.4 KiB
Java
96 lines
3.4 KiB
Java
/*
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* Copyright (c) 2020, 2022, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package gc;
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/* @test
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* @bug 8240696
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* @library /test/lib
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* @build jdk.test.whitebox.WhiteBox
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* @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
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* @run main/othervm
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* -Xbootclasspath/a:.
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* -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI
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* gc.TestReferenceClearDuringMarking
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*/
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import java.lang.ref.WeakReference;
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import jdk.test.whitebox.WhiteBox;
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public class TestReferenceClearDuringMarking {
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private static final WhiteBox WB = WhiteBox.getWhiteBox();
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private static Object testA = new Object();
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private static Object testB = new Object();
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private static final WeakReference<Object> refA1 = new WeakReference<Object>(testA);
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private static final WeakReference<Object> refA2 = new WeakReference<Object>(testA);
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private static final WeakReference<Object> refB1 = new WeakReference<Object>(testB);
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private static final WeakReference<Object> refB2 = new WeakReference<Object>(testB);
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private static void test() {
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while (!WB.isObjectInOldGen(testA) ||
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!WB.isObjectInOldGen(testB) ||
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!WB.isObjectInOldGen(refA1) ||
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!WB.isObjectInOldGen(refA2) ||
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!WB.isObjectInOldGen(refB1) ||
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!WB.isObjectInOldGen(refB2)) {
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WB.fullGC();
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}
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WB.concurrentGCAcquireControl();
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try {
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testA = null;
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testB = null;
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WB.concurrentGCRunTo(WB.AFTER_MARKING_STARTED);
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// Clear A1 early in marking, before reference discovery.
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refA1.clear();
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WB.concurrentGCRunTo(WB.BEFORE_MARKING_COMPLETED);
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// Clear B1 late in marking, after reference discovery.
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refB1.clear();
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WB.concurrentGCRunToIdle();
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// Verify that A2 and B2 still cleared by GC, i.e. the preceding
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// clear operations did not extend the lifetime of the referents.
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if (!refA2.refersTo(null)) {
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throw new RuntimeException("refA2 not cleared");
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}
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if (!refB2.refersTo(null)) {
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throw new RuntimeException("refB2 not cleared");
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}
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} finally {
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WB.concurrentGCReleaseControl();
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}
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}
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public static void main(String[] args) {
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if (WB.supportsConcurrentGCBreakpoints()) {
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test();
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}
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}
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}
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