| /* |
| * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 5086470 6358247 |
| * @summary Basic Test for ThreadMXBean.dumpAllThreads(false, true) |
| * and getThreadInfo of customized JSR-166 synchronizers. |
| * @author Mandy Chung |
| * |
| * @build Barrier |
| * @build ThreadDump |
| * @run main/othervm MyOwnSynchronizer |
| */ |
| |
| import java.lang.management.*; |
| import java.util.*; |
| import java.util.concurrent.locks.*; |
| import java.util.concurrent.TimeUnit; |
| import java.io.*; |
| |
| public class MyOwnSynchronizer { |
| static ThreadMXBean mbean = ManagementFactory.getThreadMXBean(); |
| static Mutex mutex = new Mutex(); |
| static MyThread thread = new MyThread(); |
| public static void main(String[] argv) throws Exception { |
| if (!mbean.isSynchronizerUsageSupported()) { |
| System.out.println("Monitoring of synchronizer usage not supported"); |
| return; |
| } |
| |
| thread.setDaemon(true); |
| thread.start(); |
| |
| // wait until myThread acquires mutex |
| while (!mutex.isLocked()) { |
| try { |
| Thread.sleep(100); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| |
| ThreadDump.threadDump(); |
| // Test dumpAllThreads with locked synchronizers |
| ThreadInfo[] tinfos = mbean.dumpAllThreads(false, true); |
| for (ThreadInfo ti : tinfos) { |
| MonitorInfo[] monitors = ti.getLockedMonitors(); |
| if (monitors.length != 0) { |
| throw new RuntimeException("Name: " + ti.getThreadName() + |
| " has non-empty locked monitors = " + monitors.length); |
| } |
| LockInfo[] syncs = ti.getLockedSynchronizers(); |
| if (ti.getThreadId() == thread.getId()) { |
| thread.checkLockedSyncs(ti, syncs); |
| } |
| } |
| |
| // Test getThreadInfo with locked synchronizers |
| tinfos = mbean.getThreadInfo(new long[] {thread.getId()}, false, true); |
| if (tinfos.length != 1) { |
| throw new RuntimeException("getThreadInfo() returns " + |
| tinfos.length + " ThreadInfo objects. Expected 0."); |
| } |
| ThreadInfo ti = tinfos[0]; |
| if (ti.getLockedMonitors().length != 0) { |
| throw new RuntimeException("Name: " + ti.getThreadName() + |
| " has non-empty locked monitors = " + |
| ti.getLockedMonitors().length); |
| } |
| thread.checkLockedSyncs(ti, ti.getLockedSynchronizers()); |
| |
| System.out.println("Test passed"); |
| } |
| |
| static class Mutex implements Lock, java.io.Serializable { |
| |
| // Our internal helper class |
| class Sync extends AbstractQueuedSynchronizer { |
| // Report whether in locked state |
| protected boolean isHeldExclusively() { |
| return getState() == 1; |
| } |
| |
| // Acquire the lock if state is zero |
| public boolean tryAcquire(int acquires) { |
| assert acquires == 1; // Otherwise unused |
| if (compareAndSetState(0, 1)) { |
| setExclusiveOwnerThread(Thread.currentThread()); |
| return true; |
| } |
| return false; |
| } |
| |
| // Release the lock by setting state to zero |
| protected boolean tryRelease(int releases) { |
| assert releases == 1; // Otherwise unused |
| if (getState() == 0) throw new IllegalMonitorStateException(); |
| setExclusiveOwnerThread(null); |
| setState(0); |
| return true; |
| } |
| |
| // Provide a Condition |
| Condition newCondition() { return new ConditionObject(); } |
| |
| // Deserialize properly |
| private void readObject(ObjectInputStream s) |
| throws IOException, ClassNotFoundException { |
| s.defaultReadObject(); |
| setState(0); // reset to unlocked state |
| } |
| } |
| |
| // The sync object does all the hard work. We just forward to it. |
| private final Sync sync = new Sync(); |
| |
| public void lock() { sync.acquire(1); } |
| public boolean tryLock() { return sync.tryAcquire(1); } |
| public void unlock() { sync.release(1); } |
| public Condition newCondition() { return sync.newCondition(); } |
| public boolean isLocked() { return sync.isHeldExclusively(); } |
| public boolean hasQueuedThreads() { return sync.hasQueuedThreads(); } |
| public void lockInterruptibly() throws InterruptedException { |
| sync.acquireInterruptibly(1); |
| } |
| public boolean tryLock(long timeout, TimeUnit unit) throws InterruptedException { |
| return sync.tryAcquireNanos(1, unit.toNanos(timeout)); |
| } |
| |
| public AbstractOwnableSynchronizer getSync() { return sync; } |
| } |
| |
| static class MyThread extends Thread { |
| public MyThread() { |
| super("MyThread"); |
| } |
| public void run() { |
| mutex.lock(); |
| Object o = new Object(); |
| synchronized(o) { |
| try { |
| o.wait(); |
| } catch (InterruptedException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| } |
| int OWNED_SYNCS = 1; |
| void checkLockedSyncs(ThreadInfo info, LockInfo[] syncs) { |
| if (!getName().equals(info.getThreadName())) { |
| throw new RuntimeException("Name: " + info.getThreadName() + |
| " not matched. Expected: " + getName()); |
| } |
| |
| if (syncs.length != OWNED_SYNCS) { |
| throw new RuntimeException("Number of locked syncs = " + |
| syncs.length + |
| " not matched. Expected: " + OWNED_SYNCS); |
| } |
| AbstractOwnableSynchronizer s = mutex.getSync(); |
| String lockName = s.getClass().getName(); |
| int hcode = System.identityHashCode(s); |
| if (!lockName.equals(syncs[0].getClassName())) { |
| throw new RuntimeException("LockInfo : " + syncs[0] + |
| " class name not matched. Expected: " + lockName); |
| } |
| if (hcode != syncs[0].getIdentityHashCode()) { |
| throw new RuntimeException("LockInfo: " + syncs[0] + |
| " IdentityHashCode not matched. Expected: " + hcode); |
| } |
| |
| } |
| } |
| } |