:: Ord a => [a] -> [a] -package:focus -package:errors -package:safe -package:witherable -package:extra -package:basement -package:containers -package:statistics package:lifted-base is:exact

Generalized version of runInBoundThread.
Generalized version of runInUnboundThread.
Generalized version of mask_.
Generalized version of uninterruptibleMask_.