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.