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

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