1 /* 2 * Copyright (c) 2020, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24 package runtime.whitebox; 25 26 /* 27 * @test TestWBDeflateIdleMonitors 28 * @bug 8246477 29 * @summary Test verify that WB method deflateIdleMonitors works correctly. 30 * @library /test/lib 31 * @modules java.base/jdk.internal.misc 32 * java.management 33 * @build sun.hotspot.WhiteBox 34 * @run driver ClassFileInstaller sun.hotspot.WhiteBox 35 * @run driver runtime.whitebox.TestWBDeflateIdleMonitors 36 */ 37 import jdk.test.lib.Asserts; 38 import jdk.test.lib.process.ProcessTools; 39 import jdk.test.lib.process.OutputAnalyzer; 40 import sun.hotspot.WhiteBox; 41 42 public class TestWBDeflateIdleMonitors { 43 44 public static void main(String args[]) throws Exception { 45 ProcessBuilder pb = ProcessTools.createTestJvm( 46 "-Xbootclasspath/a:.", 47 "-XX:+UnlockDiagnosticVMOptions", 48 "-XX:+WhiteBoxAPI", 49 "-Xlog:monitorinflation=info", 50 InflateMonitorsTest.class.getName()); 51 52 OutputAnalyzer output = new OutputAnalyzer(pb.start()); 53 System.out.println(output.getStdout()); 54 output.shouldHaveExitValue(0); 55 output.shouldContain("WhiteBox initiated DeflateIdleMonitors"); 56 } 57 58 public static class InflateMonitorsTest { 59 static WhiteBox wb = WhiteBox.getWhiteBox(); 60 public static Object obj; 61 62 public static void main(String args[]) { 63 obj = new Object(); 64 synchronized (obj) { 65 // HotSpot implementation detail: asking for the hash code 66 // when the object is locked causes monitor inflation. 67 if (obj.hashCode() == 0xBAD) System.out.println("!"); 68 Asserts.assertEQ(wb.isMonitorInflated(obj), true, 69 "Monitor should be inflated."); 70 } 71 boolean did_deflation = wb.deflateIdleMonitors(); 72 Asserts.assertEQ(did_deflation, true, 73 "deflateIdleMonitors() should have worked."); 74 Asserts.assertEQ(wb.isMonitorInflated(obj), false, 75 "Monitor should be deflated."); 76 } 77 } 78 }