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Race as social currency. When they say divide and conquer, they're telling you the secret to power. Fred Hampton flipped the script in nineteen sixty nine. This twenty one year old Black Panther leader did something revolutionary. He united people across race lines through what he called the Rainbow Coalition. While others saw differences, Hampton saw shared struggles. He brought together Black Panthers, young lords and poor white Americans to fight for better housing, education, and health care. His message, Our common enemies are poverty and depression, not each other. Hamptons vision threatened the status quo so much that the FBI assassinated him in his sleep. His legacy reminds us, True power comes when we recognize our shared humanity and fight together for justice. Share, believe, inspire blacks, be.

… And now I think it might be also good to show the flavour of work-stealing version implementation of quicksort. Here it is: qsortDC' :: (Ord a, Copyable a) => -- | Threshold for the length of vector to switch to sequential sort. Int -> DivideConquer α Pair (LV.Vector a) qsortDC' thresh = DivideConquer { divide = \vs -> case LV.size vs of (Ur n, v) | n <= 1 -> v `lseq` Control.pure Done | n <= thresh -> Done Control.<$ LV.qsort 0 v | otherwise -> Control.do let i = n `quot` 2 (Ur pivot, v) <- LV.copyAtMut i v (lo, hi) <- LV.divide pivot v 0 n Control.pure $ Continue $ Pair lo hi } It is just a rewritten version of `qsort` in the post, but now defined in terms of `DivideConquer` datatype: data DivideConquer α t a = DivideConquer { divide :: forall β. (α >= β) => Mut β a %1 -> BO β (Result β t a) } data Result β t a = Done | Continue (t (Mut β a)) That is, it just encodes the divide-and-conquer nature within general API, using `BO`-monad inside each step. Actual computation can now be done by calling `divideAndConquer` combinator on it: qsortDC :: (RandomGen g, Ord a, Copyable a, α >= β) => -- | The # of workers. Int -> -- | Threshold for the length of vector to switch to sequential sort. Int -> g -> Mut α (LV.Vector a) %1 -> BO β (Mut α (LV.Vector a)) qsortDC nwork thresh = divideAndConquer nwork (qsortDC' thresh) divideAndConquer :: forall α β t a g. (RandomGen g, Data.Traversable t, Consumable (t ()), α >= β) => -- | The # of workers. Int -> DivideConquer α t a -> g -> Mut α a %1 -> BO β (Mut α a) Under the hood, `divideAndConquer` uses some unsafe constructs, such as concurrent queues, but it hides its implementational detail behind the `BO`-based API, and user can describe their divide-and-conquer algorithm purely with `BO`. Although the scheduler logic of `divideAndConquer` still has lot of room of improvements, but it seems quite promising example of applicability of Pure Borrow

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