public void Dispatch()
{
IQueueReader reader = null;
Item item = new Item();
IQueueReader[] outstandingReaders = null;
IQueueWaiter[] waiters = null;
bool itemAvailable = true;
lock (ThisLock)
{
itemAvailable = !((_queueState == QueueState.Closed) || (_queueState == QueueState.Shutdown));
GetWaiters(out waiters);
if (_queueState != QueueState.Closed)
{
_itemQueue.MakePendingItemAvailable();
if (_readerQueue.Count > 0)
{
item = _itemQueue.DequeueAvailableItem();
reader = _readerQueue.Dequeue();
if (_queueState == QueueState.Shutdown && _readerQueue.Count > 0 && _itemQueue.ItemCount == 0)
{
outstandingReaders = new IQueueReader[_readerQueue.Count];
_readerQueue.CopyTo(outstandingReaders, 0);
_readerQueue.Clear();
itemAvailable = false;
}
}
}
}
if (outstandingReaders != null)
{
if (s_completeOutstandingReadersCallback == null)
{
s_completeOutstandingReadersCallback = CompleteOutstandingReadersCallback;
}
ActionItem.Schedule(s_completeOutstandingReadersCallback, outstandingReaders);
}
if (waiters != null)
{
CompleteWaitersLater(itemAvailable, waiters);
}
if (reader != null)
{
InvokeDequeuedCallback(item.DequeuedCallback);
reader.Set(item);
}
}
