co.paralleluniverse.strands.queues.SingleConsumerArrayDWordQueue Maven / Gradle / Ivy
/*
* Quasar: lightweight threads and actors for the JVM.
* Copyright (c) 2013-2015, Parallel Universe Software Co. All rights reserved.
*
* This program and the accompanying materials are dual-licensed under
* either the terms of the Eclipse Public License v1.0 as published by
* the Eclipse Foundation
*
* or (per the licensee's choosing)
*
* under the terms of the GNU Lesser General Public License version 3.0
* as published by the Free Software Foundation.
*/
package co.paralleluniverse.strands.queues;
/**
*
* @author pron
*/
abstract class SingleConsumerArrayDWordQueue extends SingleConsumerArrayPrimitiveQueue {
private final long[] array;
public SingleConsumerArrayDWordQueue(int size) {
super(size);
this.array = new long[this.capacity];
}
long rawValue(int index) {
return array[index];
}
@Override
int arrayLength() {
return array.length;
}
public boolean enqRaw(long item) {
final long i = preEnq();
if (i < 0)
return false;
array[(int) i & mask] = item; // no need for volatile semantics because postEnq does a volatile write (cas) which is then read in await value
postEnq(i);
return true;
}
@Override
void copyValue(int to, int from) {
array[to] = array[from];
}
}