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

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