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-- | A stupid Semaphore utility thing
module Control.Concurrent.Sema
( mapPool,
)
where
import Alpha
import Control.Concurrent.Async (mapConcurrently)
import qualified Control.Concurrent.MSem as Sem
-- | Simaphore-based throttled 'mapConcurrently'.
mapPool :: Traversable t => Int -> (a -> IO b) -> t a -> IO (t b)
mapPool n f xs = do
sima <- Sem.new n
mapConcurrently (Sem.with sima <. f) xs
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