com.mchange.v2.lang.ThreadUtils Maven / Gradle / Ivy
/*
* Distributed as part of mchange-commons-java 0.2.9
*
* Copyright (C) 2015 Machinery For Change, Inc.
*
* Author: Steve Waldman
*
* This library is free software; you can redistribute it and/or modify
* it under the terms of EITHER:
*
* 1) The GNU Lesser General Public License (LGPL), version 2.1, as
* published by the Free Software Foundation
*
* OR
*
* 2) The Eclipse Public License (EPL), version 1.0
*
* You may choose which license to accept if you wish to redistribute
* or modify this work. You may offer derivatives of this work
* under the license you have chosen, or you may provide the same
* choice of license which you have been offered here.
*
* This software 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.
*
* You should have received copies of both LGPL v2.1 and EPL v1.0
* along with this software; see the files LICENSE-EPL and LICENSE-LGPL.
* If not, the text of these licenses are currently available at
*
* LGPL v2.1: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html
* EPL v1.0: http://www.eclipse.org/org/documents/epl-v10.php
*
*/
package com.mchange.v2.lang;
import com.mchange.v2.log.*;
import java.lang.reflect.Method;
public final class ThreadUtils
{
private final static MLogger logger = MLog.getLogger( ThreadUtils.class );
final static Method holdsLock;
static
{
Method _holdsLock;
try
{ _holdsLock = Thread.class.getMethod("holdsLock", new Class[] { Object.class }); }
catch (NoSuchMethodException e)
{ _holdsLock = null; }
holdsLock = _holdsLock;
}
public static void enumerateAll( Thread[] threads )
{ ThreadGroupUtils.rootThreadGroup().enumerate( threads ); }
/**
* @return null if cannot be determined, otherwise true or false
*/
public static Boolean reflectiveHoldsLock( Object o )
{
try
{
if (holdsLock == null)
return null;
else
return (Boolean) holdsLock.invoke( null, new Object[] { o } );
}
catch (Exception e)
{
if ( logger.isLoggable( MLevel.FINER ) )
logger.log( MLevel.FINER, "An Exception occurred while trying to call Thread.holdsLock( ... ) reflectively.", e);
return null;
}
}
private ThreadUtils()
{}
}