98 lines
3.4 KiB
Java
98 lines
3.4 KiB
Java
/*
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* Copyright (c) 2024, 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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/*
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* @test
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* @summary Test ThreadMXBean.getLockedMonitors returns information about an object
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* monitor lock entered with a synchronized native method or JNI MonitorEnter
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* @run junit/othervm LockedMonitorInNative
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*/
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import java.lang.management.ManagementFactory;
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import java.lang.management.ThreadInfo;
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import java.lang.management.ThreadMXBean;
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import java.util.Arrays;
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import org.junit.jupiter.api.Test;
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import org.junit.jupiter.api.BeforeAll;
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import static org.junit.jupiter.api.Assertions.*;
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public class LockedMonitorInNative {
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@BeforeAll
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static void setup() throws Exception {
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System.loadLibrary("LockedMonitorInNative");
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}
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/**
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* Test ThreadMXBean.getLockedMonitors returns information about an object
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* monitor lock entered with a synchronized native method.
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*/
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@Test
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void testSynchronizedNative() {
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Object lock = this;
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runWithSynchronizedNative(() -> {
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assertTrue(holdsLock(lock), "Thread does not hold lock");
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});
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}
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/**
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* Test ThreadMXBean.getLockedMonitors returns information about an object
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* monitor lock entered with JNI MonitorEnter.
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*/
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@Test
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void testMonitorEnteredInNative() {
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var lock = new Object();
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runWithMonitorEnteredInNative(lock, () -> {
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assertTrue(holdsLock(lock), "Thread does not hold lock");
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});
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}
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private boolean holdsLock(Object lock) {
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int hc = System.identityHashCode(lock);
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long tid = Thread.currentThread().threadId();
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ThreadInfo ti = ManagementFactory.getPlatformMXBean(ThreadMXBean.class)
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.getThreadInfo(new long[] { tid }, true, true)[0];
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return Arrays.stream(ti.getLockedMonitors())
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.anyMatch(mi -> mi.getIdentityHashCode() == hc);
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}
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/**
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* Invokes the given task's run method while holding the monitor for "this".
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*/
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private synchronized native void runWithSynchronizedNative(Runnable task);
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/**
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* Invokes the given task's run method while holding the monitor for the given
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* object. The monitor is entered with JNI MonitorEnter, and exited with JNI MonitorExit.
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*/
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private native void runWithMonitorEnteredInNative(Object lock, Runnable task);
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/**
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* Called from native methods to run the given task.
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*/
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private void run(Runnable task) {
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task.run();
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}
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}
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