/* -*- tab-width: 4 -*-
*
* Electric(tm) VLSI Design System
*
* File: Scheduler.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.runtime;
import com.sun.electric.tool.util.concurrent.datastructures.IStructure;
import com.sun.electric.tool.util.concurrent.datastructures.MultipleQueuesStructure;
import com.sun.electric.tool.util.concurrent.datastructures.WorkStealingStructure;
import com.sun.electric.tool.util.concurrent.patterns.PTask;
import com.sun.electric.tool.util.concurrent.utils.ConcurrentCollectionFactory;
/**
* @author fs239085
*
*/
public class Scheduler {
public enum SchedulingStrategy {
queue, stack, workStealing, multipleQueues, fcQueue;
}
public static IStructure<PTask> createScheduler(SchedulingStrategy strategy, int numOfThreads)
throws UnknownSchedulerException {
IStructure<PTask> result = null;
if (strategy.equals(SchedulingStrategy.queue)) {
result = ConcurrentCollectionFactory.createLockFreeQueue();
} else if (strategy.equals(SchedulingStrategy.stack)) {
result = ConcurrentCollectionFactory.createLockFreeStack();
} else if (strategy.equals(SchedulingStrategy.workStealing)) {
result = WorkStealingStructure.createForThreadPool(numOfThreads);
} else if (strategy.equals(SchedulingStrategy.multipleQueues)) {
result = new MultipleQueuesStructure<PTask>(numOfThreads);
} else if (strategy.equals(SchedulingStrategy.fcQueue)) {
result = ConcurrentCollectionFactory.createFCQueue();
} else {
throw new UnknownSchedulerException();
}
return result;
}
public static class UnknownSchedulerException extends Exception {
}
public static String getAvailableScheduler() {
StringBuilder builder = new StringBuilder();
for (SchedulingStrategy strategy : SchedulingStrategy.values()) {
builder.append(strategy.toString());
builder.append(", ");
}
return builder.substring(0, builder.length() - 2);
}
}