79 lines
3.1 KiB
Java
79 lines
3.1 KiB
Java
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/*
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* Copyright (c) 2020, 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 runtime.whitebox;
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/*
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* @test
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* @bug 8246477
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* @summary Test to verify that WB method deflateIdleMonitors works correctly.
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* @library /test/lib
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* @modules java.base/jdk.internal.misc
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* java.management
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* @build sun.hotspot.WhiteBox
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* @run driver ClassFileInstaller sun.hotspot.WhiteBox
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* @run driver runtime.whitebox.TestWBDeflateIdleMonitors
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*/
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import jdk.test.lib.Asserts;
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import jdk.test.lib.process.ProcessTools;
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import jdk.test.lib.process.OutputAnalyzer;
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import sun.hotspot.WhiteBox;
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public class TestWBDeflateIdleMonitors {
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public static void main(String args[]) throws Exception {
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ProcessBuilder pb = ProcessTools.createTestJvm(
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"-Xbootclasspath/a:.",
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"-XX:+UnlockDiagnosticVMOptions",
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"-XX:+WhiteBoxAPI",
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"-Xlog:monitorinflation=info",
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InflateMonitorsTest.class.getName());
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OutputAnalyzer output = new OutputAnalyzer(pb.start());
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System.out.println(output.getStdout());
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output.shouldHaveExitValue(0);
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output.shouldContain("WhiteBox initiated DeflateIdleMonitors");
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}
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public static class InflateMonitorsTest {
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static WhiteBox wb = WhiteBox.getWhiteBox();
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public static Object obj;
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public static void main(String args[]) {
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obj = new Object();
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synchronized (obj) {
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// HotSpot implementation detail: asking for the hash code
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// when the object is locked causes monitor inflation.
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if (obj.hashCode() == 0xBAD) System.out.println("!");
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Asserts.assertEQ(wb.isMonitorInflated(obj), true,
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"Monitor should be inflated.");
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}
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boolean did_deflation = wb.deflateIdleMonitors();
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Asserts.assertEQ(did_deflation, true,
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"deflateIdleMonitors() should have worked.");
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Asserts.assertEQ(wb.isMonitorInflated(obj), false,
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"Monitor should be deflated.");
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}
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}
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}
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