Testing nested join.
Threads 0 to 7 should start in numerical order
and finish in reverse order.
Thread 0 starting.
Thread 1 starting.
Thread 2 starting.
Thread 3 starting.
Thread 4 starting.
Thread 5 starting.
Thread 6 starting.
Thread 7 starting.
Thread 7 done.
Thread 6 done.
Thread 5 done.
Thread 4 done.
Thread 3 done.
Thread 2 done.
Thread 1 done.
Thread 0 done.
Nested join test done.