There are a few exceptions:
@itemize @bullet
+@item
+Problem 1-2, @code{thread_join()}. Some other code expects
+@code{THREAD_JOIN_IMPLEMENTED} to be defined once you've implemented
+this function.
+
@item
Problem 1-4, the advanced scheduler. We must be able to turn this on
and off with a compile time directive. You must use the macro name we