Thread APIs

[Doug Lea]

Rather than leaving this for another 3day spurt 6months from
now :-), we should at least see if the Executor/Future approach
looks like it will succeed. How about:

1. Kevlin: Propose a concrete API.

2. Doug Schmidt and others: Confirm that this ...
     * is easily supported in ACE, Boost, pthreads, Win32, uC++, ...
     * covers all of the use cases worth covering. That is,
         are there common concurrent programs/components that
         cannot be written using the API?

3. Rinse, repeat.

-Doug