Checking this in before I pull the thread code out to its own file.

src/task_state.rs

@@ -0,0 +1,40 @@
+/// The different states a Task can go through during its lifetime.
+pub enum TaskState
+{
+   /// The state that every Task starts in.
+   ///
+   /// The STARTING state can only lead to the processing state.
+   Starting,
+
+   /// The state that each Task is in while it is actually
+   /// being process and running on a thread.
+   ///
+   /// The PROCESSING state can only lead to WAITING,
+   /// FINISHED, or UNKNOWN states.
+   Processing,
+
+   /// The state a Task is in while it is waiting for child
+   /// tasks to switch to the FINISHED state.
+   ///
+   /// The WAITING state can only lead to the DONE_WAITING
+   /// and UNKNOWN states.
+   Waiting,
+
+   /// The state a Task is in once it is done processing
+   /// child tasks, but prior to going back to the PROCESSING state.
+   ///
+   /// The DONE_WAITING state can only lead to the PROCESSING
+   /// and UNKNOWN states.
+   DoneWaiting,
+
+   /// The state a Task will be in when it is FINISHED processing
+   /// and ready to be destroyed.
+   ///
+   /// The FINISHED state cannot lead to any states and shows that the
+   /// task is completed.
+   Finished,
+
+   /// The state a Task will be placed in if it is detected to be
+   /// in an inproper state during its lifetime.
+   Unknown
+}