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Async provides a simple process pool that allocates a number of worker threads
that may then be utilized collectively without having to deal directly with
threads. Results of jobs sent to the pool are “future” objects, called Asyncs.
Asyncs’ values are then acquired by calling Async.sync, which blocks until the
value has been set by the pool. A supervisor thread monitors the worker threads
and restarts any that terminate abnormally.

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