public IAsyncResult BeginWaitForItem(TimeSpan timeout, AsyncCallback callback, object state)
{
lock (ThisLock)
{
if (_queueState == QueueState.Open)
{
if (!_itemQueue.HasAvailableItem)
{
var waiter = new AsyncQueueWaiter(timeout, callback, state);
_waiterList.Add(waiter);
return(waiter);
}
}
else if (_queueState == QueueState.Shutdown)
{
if (!_itemQueue.HasAvailableItem && _itemQueue.HasAnyItem)
{
var waiter = new AsyncQueueWaiter(timeout, callback, state);
_waiterList.Add(waiter);
return(waiter);
}
}
}
return(new TypedCompletedAsyncResult <bool>(true, callback, state));
}
public bool EndWaitForItem(IAsyncResult result)
{
var typedResult = result as TypedCompletedAsyncResult <bool>;
if (typedResult != null)
{
return(TypedCompletedAsyncResult <bool> .End(result));
}
return(AsyncQueueWaiter.End(result));
}