There are a few exceptions:
@itemize @bullet
-@item
-Problem 1-2, @func{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