public bool MoveNext()
{
if (currentQueuePosition == sharedState.currentEnumeratedObjectListSize)
{
lock (sharedState.syncObject)
{ //double check instead the size was changed between the while and the lock
while (currentQueuePosition == sharedState.currentEnumeratedObjectListSize)
{
//Check for any exception thrown by the task executers
if (sharedState.exceptionOccured != null)
{
throw sharedState.exceptionOccured;
}
//If all enumerators are done or enumerator is disposed return false
if (sharedState.allEnumeratorsDone || sharedState.disposed)
{
return(false);
}
//If not done creating the list block until the list status has changed
else
{
Monitor.Wait(sharedState.syncObject);
}
}
}
}
currentPositionNode = currentPositionNode.Next;
currentQueuePosition++;
return(true);
}
public LinkableLinkedListBlockingEnumerator(EnumerateTaskSharedState sharedState)
{
this.sharedState = sharedState;
while (currentPositionNode == null)
{
lock (sharedState.syncObject)
{
//Check for any exception thrown by the task executers
if (sharedState.exceptionOccured != null)
{
throw sharedState.exceptionOccured;
}
//Create first node when the accumulated list has elements
if (sharedState.accumulatedEnumeratedObjectList.First != null)
{
currentPositionNode = new LinkableLinkedListNode(null);
currentPositionNode.Next = sharedState.accumulatedEnumeratedObjectList.First;
}
//If all enumerators are done or enumerator is disposed, break
else if (sharedState.allEnumeratorsDone || sharedState.disposed)
{
break;
}
//If there are no elements in the list yet block until status changed
else
{
Monitor.Wait(sharedState.syncObject);
}
}
}
}
public void AppendValue(object value)
{
//Empty list
if (_first == null)
{
_first = new LinkableLinkedListNode(value);
_last = _first;
_count = 1;
}
else
{
_last.Next = new LinkableLinkedListNode(value);
_last = _last.Next;
_count++;
}
}
public void AppentList(LinkableLinkedList list)
{
//Empty list
if (_first == null)
{
_first = list.First;
_last = list.Last;
_count = list.Count;
}
else
{
_last.Next = list.First;
//If the given list to append is empty
if (list.Last != null)
{
_last = list.Last;
}
_count += list.Count;
}
}
