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package com.mbien.opencl;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;
/**
*
* @author Michael Bien
*/
public class QueueBarrier {
private final CountDownLatch latch;
private final Set<CLCommandQueue> queues;
public QueueBarrier(int queueCount) {
this.latch = new CountDownLatch(queueCount);
this.queues = null;
}
public QueueBarrier(CLCommandQueue... allowedQueues) {
this.latch = new CountDownLatch(allowedQueues.length);
HashSet<CLCommandQueue> set = new HashSet<CLCommandQueue>(allowedQueues.length);
for (CLCommandQueue queue : allowedQueues) {
set.add(queue);
}
this.queues = Collections.unmodifiableSet(set);
}
/**
* Blocks the current Thread until all commands on the CLCommandQueue finished excecution.
* This method may be invoked concurrently without synchronization on the QueueBarrier object
* as long each Thread passes a distinct CLCommandQueue as parameter to this method.
*/
public QueueBarrier waitFor(CLCommandQueue queue) {
checkQueue(queue);
queue.putBarrier();
latch.countDown();
return this;
}
/**
* Blocks the current Thread until the given events on the CLCommandQueue occurred.
* This method may be invoked concurrently without synchronization on the QueueBarrier object
* as long each Thread passes a distinct CLCommandQueue as parameter to this method.
*/
public QueueBarrier waitFor(CLCommandQueue queue, CLEventList events) {
checkQueue(queue);
queue.putWaitForEvents(events, true);
latch.countDown();
return this;
}
/**
* Blocks until all Threads which called {@link #waitFor}
* continue excecution.
* This method blocks only once, all subsequent calls are ignored.
*/
public QueueBarrier await() throws InterruptedException {
latch.await();
return this;
}
/**
* @see #await()
* @param timeout the maximum time to wait
* @param unit the time unit of the {@code timeout} argument
*/
public QueueBarrier await(long timeout, TimeUnit unit) throws InterruptedException {
latch.await(timeout, unit);
return this;
}
private final void checkQueue(CLCommandQueue queue) throws IllegalArgumentException {
if (queues != null && !queues.contains(queue)) {
throw new IllegalArgumentException(queue + " is not in the allowedQueues Set: " + queues);
}
}
}
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