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a74a0c0844
Streamly is a more appropriate name and conveys the core idea. Stream concurrently = streamly.
23 lines
667 B
Haskell
23 lines
667 B
Haskell
import Control.Applicative ((<|>), empty)
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import Control.Concurrent (myThreadId)
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import Control.Monad.IO.Class (liftIO)
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import System.IO (stdout, hSetBuffering, BufferMode(LineBuffering))
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import System.Random (randomIO)
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import Streamly
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main = runStreamT $ do
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liftIO $ hSetBuffering stdout LineBuffering
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x <- loop "A " 2
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y <- loop "B " 2
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liftIO $ myThreadId >>= putStr . show
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>> putStr " "
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>> print (x, y)
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where
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loop name n = do
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rnd <- liftIO (randomIO :: IO Int)
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let result = (name ++ show rnd)
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repeat = if n > 1 then loop name (n - 1) else empty
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in (return result) <|> repeat
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