Esempio n. 1
0
        public bool Dequeue(out T item)
        {
            item = default(T);
            SingleLinkNode <T> oldHead = null;

            bool haveAdvancedHead = false;

            while (!haveAdvancedHead)
            {
                oldHead = head;
                SingleLinkNode <T> oldTail     = tail;
                SingleLinkNode <T> oldHeadNext = oldHead.Next;

                if (oldHead == head)
                {
                    if (oldHead == oldTail)
                    {
                        if (oldHeadNext == null)
                        {
                            return(false);
                        }
                        SyncMethods.CAS <SingleLinkNode <T> >(ref tail, oldTail, oldHeadNext);
                    }

                    else
                    {
                        item             = oldHeadNext.Item;
                        haveAdvancedHead =
                            SyncMethods.CAS <SingleLinkNode <T> >(ref head, oldHead, oldHeadNext);
                    }
                }
            }
            return(true);
        }
Esempio n. 2
0
        public void Enqueue(T item)
        {
            SingleLinkNode <T> oldTail = null;
            SingleLinkNode <T> oldTailNext;

            SingleLinkNode <T> newNode = new SingleLinkNode <T>();

            newNode.Item = item;

            bool newNodeWasAdded = false;

            while (!newNodeWasAdded)
            {
                oldTail     = tail;
                oldTailNext = oldTail.Next;

                if (tail == oldTail)
                {
                    if (oldTailNext == null)
                    {
                        newNodeWasAdded = SyncMethods.CAS <SingleLinkNode <T> >(ref tail.Next, null, newNode);
                    }
                    else
                    {
                        SyncMethods.CAS <SingleLinkNode <T> >(ref tail, oldTail, oldTailNext);
                    }
                }
            }

            SyncMethods.CAS <SingleLinkNode <T> >(ref tail, oldTail, newNode);
        }