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This package provides a higher-level interface over threads, in which an
Async a is a concurrent thread that will eventually deliver a value of
type a. The package provides ways to create Async computations, wait for
their results, and cancel them.
Using Async is safer than using threads in two ways:
- When waiting for a thread to return a result, if the thread dies with
an exception then the caller must either re-throw the exception (wait)
or handle it (waitCatch); the exception cannot be ignored.
- The API makes it possible to build a tree of threads that are
automatically killed when their parent dies (see withAsync).
WWW: https://github.com/simonmar/async
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