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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;
/**
* A high-level utility to synchronize multiple {@link CLCommandQueue}s.
* @author Michael Bien
*/
public class MultiQueueBarrier {
private CountDownLatch latch;
private final Set<CLCommandQueue> queues;
/**
* Creates a new MultiQueueBarrier with the given queueCount.
* It is recommented to use {@link #MultiQueueBarrier(CLCommandQueue... allowedQueues)} if possible
* which restricts the set of allowed queues for the barrier.
*/
public MultiQueueBarrier(int queueCount) {
this.latch = new CountDownLatch(queueCount);
this.queues = null;
}
/**
* Creates a new MultiQueueBarrier for the given queues.
*/
public MultiQueueBarrier(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 {@link CLCommandQueue} finished excecution.
* This method may be invoked concurrently without synchronization on the MultiQueueBarrier object
* as long each Thread passes a distinct CLCommandQueue as parameter to this method.
*/
public MultiQueueBarrier waitFor(CLCommandQueue queue) {
checkQueue(queue);
queue.putBarrier();
latch.countDown();
return this;
}
/**
* Blocks the current Thread until the given events on the {@link CLCommandQueue} occurred.
* This method may be invoked concurrently without synchronization on the MultiQueueBarrier object
* as long each Thread passes a distinct CLCommandQueue as parameter to this method.
*/
public MultiQueueBarrier waitFor(CLCommandQueue queue, CLEventList events) {
checkQueue(queue);
queue.putWaitForEvents(events, true);
latch.countDown();
return this;
}
/**
* Blocks until all Threads which called {@link #waitFor}
* continue execution.
* This method blocks only once, all subsequent calls are ignored.
*/
public MultiQueueBarrier 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 MultiQueueBarrier await(long timeout, TimeUnit unit) throws InterruptedException {
latch.await(timeout, unit);
return this;
}
/**
* Cancels this barrier and unblocks all waiting threads.
*/
public void cancelBarrier() {
while(latch.getCount() > 0)
latch.countDown();
}
/**
* Returns the current number of events which must occure before this barrier unblocks the waiting threads.
* This method is typically used for debugging and testing purposes.
*/
public long getCount() {
return latch.getCount();
}
private 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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