Name: ccC48265			Date: 12/08/97


The design of thread groups seems inadequate:

The only way to get all the threads in a thread group is with activeCount
and enumerate.  But if the number of threads changes between the two method
calls, there is no way to detect this; and if there is some way to combine
the two actions into a single atomic action, it is not documented.

Better to have a design similar to Collections, where enumerate is replaced
by a (single, atomic) method that returns an array of threads.

Also, it would be convenient to have a join method for thread groups, that
joins with every thread in the group.

(Review ID: 21520)
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