/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: OverlapHistoryLock.java
* Written by Team 7: Felix Schmidt, Daniel Lechner
*
* This code has been developed at the Karlsruhe Institute of Technology (KIT), Germany,
* as part of the course "Multicore Programming in Practice: Tools, Models, and Languages".
* Contact instructor: Dr. Victor Pankratius (pankratius@ipd.uka.de)
*
* Copyright (c) 2010 Sun Microsystems and Static Free Software
*
* 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.placement.forceDirected2.forceDirected.util.history;
import com.sun.electric.tool.placement.PlacementFrame.PlacementNode;
import java.util.concurrent.locks.ReentrantLock;
/**
* Parallel Placement
*/
public class OverlapHistoryLock extends OverlapHistory<PlacementNode> {
private static OverlapHistoryLock instance = new OverlapHistoryLock();
private static ReentrantLock lock;
public static OverlapHistoryLock getInstance() {
return instance;
}
private OverlapHistoryLock() {
lock = new ReentrantLock(true);
}
@Override
public boolean isMovementInHistory(PlacementNode node1, PlacementNode node2) {
boolean result = false;
lock.lock();
result = super.isMovementInHistory(node1, node2);
lock.unlock();
return result;
}
@Override
public void removeHistory(PlacementNode node1, PlacementNode node2) {
lock.lock();
super.removeHistory(node1, node2);
lock.unlock();
}
@Override
public void saveHistory(PlacementNode node1, PlacementNode node2) {
lock.lock();
super.saveHistory(node1, node2);
lock.unlock();
}
}