Mega Code Archive
DeadLock Detector 2
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/**
* This file is part of aion-emu <aion-emu.com>.
*
* aion-emu is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* aion-emu 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 for more details.
*
* You should have received a copy of the GNU General Public License
* along with aion-emu. If not, see <http://www.gnu.org/licenses/>.
*/
//package com.aionemu.commons.utils;
import java.lang.management.LockInfo;
import java.lang.management.ManagementFactory;
import java.lang.management.MonitorInfo;
import java.lang.management.ThreadInfo;
import java.lang.management.ThreadMXBean;
//import com.aionemu.commons.utils.ExitCode;
/**
* @author -Nemesiss-
*/
public class DeadLockDetector extends Thread
{
/** What should we do on DeadLock */
public static final byte NOTHING = 0;
/** What should we do on DeadLock */
public static final byte RESTART = 1;
/** how often check for deadlocks */
private final int sleepTime;
/**
* ThreadMXBean
*/
private final ThreadMXBean tmx;
/** What should we do on DeadLock */
private final byte doWhenDL;
/**
* Create new DeadLockDetector with given values.
*
* @param sleepTime
* @param doWhenDL
*/
public DeadLockDetector(int sleepTime, byte doWhenDL)
{
super("DeadLockDetector");
this.sleepTime = sleepTime * 1000;
this.tmx = ManagementFactory.getThreadMXBean();
this.doWhenDL = doWhenDL;
}
/**
* Check if there is a DeadLock.
*/
@Override
public final void run()
{
boolean deadlock = false;
while (!deadlock)
{
try
{
long[] ids = tmx.findDeadlockedThreads();
if (ids != null)
{
/** deadlock found :/ */
deadlock = true;
ThreadInfo[] tis = tmx.getThreadInfo(ids, true, true);
String info = "DeadLock Found!\n";
for (ThreadInfo ti : tis)
{
info += ti.toString();
}
for (ThreadInfo ti : tis)
{
LockInfo[] locks = ti.getLockedSynchronizers();
MonitorInfo[] monitors = ti.getLockedMonitors();
if (locks.length == 0 && monitors.length == 0)
{
/** this thread is deadlocked but its not guilty */
continue;
}
ThreadInfo dl = ti;
info += "Java-level deadlock:\n";
info += "\t" + dl.getThreadName() + " is waiting to lock " + dl.getLockInfo().toString() + " which is held by " + dl.getLockOwnerName()
+ "\n";
while ((dl = tmx.getThreadInfo(new long[]
{ dl.getLockOwnerId() }, true, true)[0]).getThreadId() != ti.getThreadId())
{
info += "\t" + dl.getThreadName() + " is waiting to lock " + dl.getLockInfo().toString() + " which is held by "
+ dl.getLockOwnerName() + "\n";
}
}
System.out.println(info);
if (doWhenDL == RESTART)
{
System.exit(0);
}
}
Thread.sleep(sleepTime);
}
catch (Exception e)
{
System.out.println(e);
}
}
}
}
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