非阻塞队列插入算法
? ?摘自：?http://www.ibm.com/developerworks/cn/java/j-jtp04186/
?
public class LinkedQueue <E> { private static class Node <E> { final E item; final AtomicReference<Node<E>> next; Node(E item, Node<E> next) { this.item = item; this.next = new AtomicReference<Node<E>>(next); } } private AtomicReference<Node<E>> head = new AtomicReference<Node<E>>(new Node<E>(null, null)); private AtomicReference<Node<E>> tail = head; public boolean put(E item) { Node<E> newNode = new Node<E>(item, null); while (true) { Node<E> curTail = tail.get(); Node<E> residue = curTail.next.get(); if (curTail == tail.get()) { if (residue == null) /* A */ { if (curTail.next.compareAndSet(null, newNode)) /* C */ { tail.compareAndSet(curTail, newNode) /* D */ ; return true; } } else { tail.compareAndSet(curTail, residue) /* B */; } } } }}??