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/*
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* Copyright (c) 2005, 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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* @bug 5086470 6358247
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* @summary Basic Test for ThreadMXBean.dumpAllThreads(false, true)
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* and getThreadInfo of customized JSR-166 synchronizers.
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* @author Mandy Chung
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*
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* @build Barrier
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* @build ThreadDump
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* @run main MyOwnSynchronizer
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*/
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import java.lang.management.*;
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import java.util.*;
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import java.util.concurrent.locks.*;
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import java.util.concurrent.TimeUnit;
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import java.io.*;
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public class MyOwnSynchronizer {
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static ThreadMXBean mbean = ManagementFactory.getThreadMXBean();
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static Mutex mutex = new Mutex();
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static MyThread thread = new MyThread();
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public static void main(String[] argv) throws Exception {
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if (!mbean.isSynchronizerUsageSupported()) {
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System.out.println("Monitoring of synchronizer usage not supported");
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return;
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}
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thread.setDaemon(true);
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thread.start();
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// wait until myThread acquires mutex
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while (!mutex.isLocked()) {
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try {
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Thread.sleep(100);
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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}
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ThreadDump.threadDump();
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// Test dumpAllThreads with locked synchronizers
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ThreadInfo[] tinfos = mbean.dumpAllThreads(false, true);
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for (ThreadInfo ti : tinfos) {
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MonitorInfo[] monitors = ti.getLockedMonitors();
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if (monitors.length != 0) {
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throw new RuntimeException("Name: " + ti.getThreadName() +
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" has non-empty locked monitors = " + monitors.length);
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}
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LockInfo[] syncs = ti.getLockedSynchronizers();
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if (ti.getThreadId() == thread.getId()) {
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thread.checkLockedSyncs(ti, syncs);
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}
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}
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// Test getThreadInfo with locked synchronizers
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tinfos = mbean.getThreadInfo(new long[] {thread.getId()}, false, true);
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if (tinfos.length != 1) {
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throw new RuntimeException("getThreadInfo() returns " +
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tinfos.length + " ThreadInfo objects. Expected 0.");
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}
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ThreadInfo ti = tinfos[0];
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if (ti.getLockedMonitors().length != 0) {
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throw new RuntimeException("Name: " + ti.getThreadName() +
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" has non-empty locked monitors = " +
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ti.getLockedMonitors().length);
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}
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thread.checkLockedSyncs(ti, ti.getLockedSynchronizers());
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System.out.println("Test passed");
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}
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static class Mutex implements Lock, java.io.Serializable {
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// Our internal helper class
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class Sync extends AbstractQueuedSynchronizer {
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// Report whether in locked state
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protected boolean isHeldExclusively() {
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return getState() == 1;
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}
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// Acquire the lock if state is zero
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public boolean tryAcquire(int acquires) {
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assert acquires == 1; // Otherwise unused
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if (compareAndSetState(0, 1)) {
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setExclusiveOwnerThread(Thread.currentThread());
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return true;
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}
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return false;
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}
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// Release the lock by setting state to zero
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protected boolean tryRelease(int releases) {
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assert releases == 1; // Otherwise unused
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if (getState() == 0) throw new IllegalMonitorStateException();
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setExclusiveOwnerThread(null);
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setState(0);
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return true;
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}
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// Provide a Condition
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Condition newCondition() { return new ConditionObject(); }
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// Deserialize properly
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private void readObject(ObjectInputStream s)
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throws IOException, ClassNotFoundException {
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s.defaultReadObject();
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setState(0); // reset to unlocked state
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}
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}
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// The sync object does all the hard work. We just forward to it.
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private final Sync sync = new Sync();
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public void lock() { sync.acquire(1); }
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public boolean tryLock() { return sync.tryAcquire(1); }
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public void unlock() { sync.release(1); }
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public Condition newCondition() { return sync.newCondition(); }
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public boolean isLocked() { return sync.isHeldExclusively(); }
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public boolean hasQueuedThreads() { return sync.hasQueuedThreads(); }
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public void lockInterruptibly() throws InterruptedException {
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sync.acquireInterruptibly(1);
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}
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public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException {
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return sync.tryAcquireNanos(1, unit.toNanos(timeout));
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}
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public AbstractOwnableSynchronizer getSync() { return sync; }
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}
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static class MyThread extends Thread {
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public MyThread() {
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super("MyThread");
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}
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public void run() {
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mutex.lock();
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Object o = new Object();
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synchronized(o) {
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try {
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o.wait();
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} catch (InterruptedException e) {
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throw new RuntimeException(e);
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}
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}
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}
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int OWNED_SYNCS = 1;
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void checkLockedSyncs(ThreadInfo info, LockInfo[] syncs) {
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if (!getName().equals(info.getThreadName())) {
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throw new RuntimeException("Name: " + info.getThreadName() +
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" not matched. Expected: " + getName());
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}
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if (syncs.length != OWNED_SYNCS) {
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throw new RuntimeException("Number of locked syncs = " +
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syncs.length +
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" not matched. Expected: " + OWNED_SYNCS);
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}
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AbstractOwnableSynchronizer s = mutex.getSync();
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String lockName = s.getClass().getName();
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int hcode = System.identityHashCode(s);
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if (!lockName.equals(syncs[0].getClassName())) {
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throw new RuntimeException("LockInfo : " + syncs[0] +
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" class name not matched. Expected: " + lockName);
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}
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if (hcode != syncs[0].getIdentityHashCode()) {
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throw new RuntimeException("LockInfo: " + syncs[0] +
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" IdentityHashCode not matched. Expected: " + hcode);
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}
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}
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}
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}
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