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/*
* Created on Tuesday, May 03 2011
*/
package com.jogamp.opencl.util.concurrent;
import com.jogamp.opencl.CLCommandQueue;
import com.jogamp.opencl.CLDevice;
import com.jogamp.opencl.CLResource;
import com.jogamp.opencl.util.CLMultiContext;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
/**
* A multithreaded pool of OpenCL command queues.
* It serves as a multiplexer distributing tasks over N queues.
* @author Michael Bien
*/
public class CLCommandQueuePool implements CLResource {
private final List<CLCommandQueue> queues;
private final ExecutorService excecutor;
private CLCommandQueuePool(Collection<CLCommandQueue> queues) {
this.queues = Collections.unmodifiableList(new ArrayList<CLCommandQueue>(queues));
this.excecutor = Executors.newFixedThreadPool(queues.size(), new QueueThreadFactory(this.queues));
}
public static CLCommandQueuePool create(CLMultiContext mc) {
return create(mc.getDevices());
}
public static CLCommandQueuePool create(Collection<CLDevice> devices, CLCommandQueue.Mode... modes) {
List<CLCommandQueue> queues = new ArrayList<CLCommandQueue>(devices.size());
for (CLDevice device : devices) {
queues.add(device.createCommandQueue(modes));
}
return create(queues);
}
public static CLCommandQueuePool create(Collection<CLCommandQueue> queues) {
return new CLCommandQueuePool(queues);
}
public <T> Future<T> submit(CLTask<T> task) {
return excecutor.submit(new TaskWrapper(task));
}
/**
* Calls {@link CLCommandQueue#flush()} on all queues.
*/
public void flush() {
for (CLCommandQueue queue : queues) {
queue.flush();
}
}
/**
* Calls {@link CLCommandQueue#finish()} on all queues.
*/
public void finish() {
for (CLCommandQueue queue : queues) {
queue.finish();
}
}
/**
* Releases all queues.
*/
public void release() {
for (CLCommandQueue queue : queues) {
queue.finish().release();
}
}
public List<CLCommandQueue> getQueues() {
return queues;
}
@Override
public String toString() {
return getClass().getSimpleName()+" [queues: "+queues.size()+"]";
}
private static class QueueThreadFactory implements ThreadFactory {
private final List<CLCommandQueue> queues;
private int index;
private QueueThreadFactory(List<CLCommandQueue> queues) {
this.queues = queues;
this.index = 0;
}
public synchronized Thread newThread(Runnable r) {
CLCommandQueue queue = queues.get(index++);
return new QueueThread(queue);
}
}
private static class QueueThread extends Thread {
private final CLCommandQueue queue;
public QueueThread(CLCommandQueue queue) {
this.queue = queue;
}
}
private static class TaskWrapper<T> implements Callable<T> {
private final CLTask<T> task;
public TaskWrapper(CLTask<T> task) {
this.task = task;
}
public T call() throws Exception {
QueueThread thread = (QueueThread) Thread.currentThread();
return task.run(thread.queue);
}
}
}
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