internal void Add(TaskItem task)
{
//signal only becomes unset when it has tasks
if (isSet)
isSet = false;
//the signal keeps a list of tasks that are waiting for it
tasks.Add(task);
//use the task's data for tracking the number of signals it's still waiting for
task.Data++;
}
public void Append(TaskItem task)
{
Debug.Assert(task.Next == null);
if (First == null)
{
Debug.Assert(Last == null);
First = Last = task;
}
else
{
Debug.Assert(Last.Next == null);
Last.Next = task;
Last = task;
}
}
public void Remove(TaskItem task, TaskItem previous)
{
if (previous == null)
{
Debug.Assert(task == First);
First = task.Next;
}
else
{
Debug.Assert(previous.Next == task);
previous.Next = task.Next;
}
if (task.Next == null)
{
Debug.Assert(Last == task);
Last = previous;
}
task.Next = null;
}
public TaskEnumerator(TaskList list)
{
this.list = list;
previous = current = null;
}
public TaskItem RemoveCurrent()
{
Debug.Assert(current != null);
TaskItem ret = current;
list.Remove(current, previous);
current = null;
return ret;
}
public bool MoveNext()
{
TaskItem next;
if (current == null)
{
if (previous == null)
next = list.First;
else
next = previous.Next;
}
else
{
next = current.Next;
}
if (next != null)
{
if (current != null)
previous = Current;
current = next;
return true;
}
return false;
}
internal void AddToActive(TaskItem task)
{
active.Append(task);
}
