com.sun.electric.tool.util.concurrent.datastructures.WorkSharingStructure Maven / Gradle / Ivy
/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: WorkSharingStructure.java
*
* Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
*
* Electric(tm) 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.
*
* Electric(tm) 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 Electric(tm); see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, Mass 02111-1307, USA.
*/
package com.sun.electric.tool.util.concurrent.datastructures;
import com.sun.electric.tool.util.concurrent.runtime.ThreadID;
/**
* @author Felix Schmidt
*
*/
@Deprecated
public class WorkSharingStructure extends WorkStealingStructure {
/**
* @param numOfThreads
* @param clazz
*/
public WorkSharingStructure(int numOfThreads) {
super(numOfThreads);
}
/*
* (non-Javadoc)
*
* @see
* com.sun.electric.tool.util.concurrent.datastructures.WorkStealingStructure
* #remove()
*/
@Override
public T remove() {
Long osThreadId = getThreadId();
Long localQueueId = dataQueuesMapping.get(osThreadId);
if (localQueueId == null) {
throw new Error("Thread not registered");
}
T result = null;
IDEStructure ownQueue = dataQueues.get(localQueueId);
if (ownQueue != null) {
result = ownQueue.remove();
if (result == null) {
int size = dataQueues.size();
if (randomizer.getRandomizer().nextInt(size + 1) == size) {
int victim = randomizer.getRandomizer().nextInt(dataQueues.size());
Long min = (victim <= ThreadID.get()) ? victim : localQueueId;
Long max = (victim <= ThreadID.get()) ? localQueueId : victim;
balance(dataQueues.get(min), dataQueues.get(max));
}
}
}
return result;
}
private void balance(IDEStructure q0, IDEStructure q1) {
}
}