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module Sorting where
import Control.Parallel (par, pseq)
sort :: (Ord a) => [a] -> [a]
sort (x:xs) = lesser ++ x:greater
where lesser = sort [y | y <- xs, y < x]
greater = sort [y | y <- xs, y >= x]
sort _ = []
parSort :: (Ord a) => [a] -> [a]
parSort (x:xs) = force greater `par` (force lesser `pseq`
(lesser ++ x:greater))
where lesser = parSort [y | y <- xs, y < x]
greater = parSort [y | y <- xs, y >= x]
parSort _ = []
seqSort :: (Ord a) => [a] -> [a]
seqSort (x:xs) = lesser `pseq` (greater `pseq`
(lesser ++ x:greater))
where lesser = seqSort [y | y <- xs, y < x]
greater = seqSort [y | y <- xs, y >= x]
seqSort _ = []
force :: [a] -> ()
force xs = go xs `pseq` ()
where go (_:xs) = go xs
go [] = 1
sillySort (x:xs) = greater `par` (lesser `pseq`
(lesser ++ x:greater))
where lesser = sillySort [y | y <- xs, y < x]
greater = sillySort [y | y <- xs, y >= x]
sillySort _ = []
parSort2 :: (Ord a) => Int -> [a] -> [a]
parSort2 d list@(x:xs)
| d <= 0 = sort list
| otherwise = force greater `par` (force lesser `pseq`
(lesser ++ x:greater))
where lesser = parSort2 d' [y | y <- xs, y < x]
greater = parSort2 d' [y | y <- xs, y >= x]
d' = d - 1
parSort2 _ _ = []