internal static bool Contains(ProducerConsumerQueue <T> target, T item)
{
Monitor.Enter(target.SyncRoot);
try
{
for (QueueItem q = target._firstElement; q != null; q = q._followingElement)
{
if (target._areEqual(q._value, item))
{
return(true);
}
}
}
finally { Monitor.Exit(target.SyncRoot); }
return(false);
}
internal static bool Remove(ProducerConsumerQueue <T> target, T item)
{
bool collectionChanged = false;
Monitor.Enter(target.SyncRoot);
try
{
for (QueueItem q = target._firstElement; q != null; q = q._followingElement)
{
if (target._areEqual(q._value, item))
{
item = q._value;
target.Count--;
collectionChanged = true;
bool wasFull = target.Count == target.BoundedCapacity;
if (q._precedingElement == null)
{
if (q._followingElement == null)
{
target._firstElement = target._lastElement = null;
target._notEmptyEvent.Reset();
}
else
{
(target._firstElement = q._followingElement)._precedingElement = null;
}
}
else if (q._followingElement == null)
{
(target._lastElement = q._precedingElement)._followingElement = null;
}
else
{
q._precedingElement._followingElement = q._followingElement;
q._followingElement._precedingElement = q._precedingElement;
}
break;
}
}
}
finally { Monitor.Exit(target.SyncRoot); }
if (collectionChanged)
{
target.RaiseItemRemoved(0, item);
}
return(collectionChanged);
}
private void Target_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
if (_isTaking && e.Action == NotifyCollectionChangedAction.Remove && e.OldItems != null && e.OldItems.Count == 1 && _target._areEqual(_current, (T)(e.OldItems[0])))
{
_isTaking = false;
}
else
{
_collectionUnchanged = false;
}
}