Description:

This package provides functions to fork threads and wait for their result,
whether it's an exception or a normal value.

Besides waiting for the termination of a single thread this packages also
provides functions to wait for a group of threads to terminate.

This package is similar to the @threadmanager@, @async@ and @spawn@ packages.
The advantages of this package are:

* Simpler API.

* More efficient in both space and time.

* No space-leak when forking a large number of threads.

* Correct handling of asynchronous exceptions.

* GHC specific functionality like @forkOn@ and @forkIOWithUnmask@.