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-- Test that threadDelay actually sleeps for (at least) as long as we
-- ask it
module Main (main) where
import Control.Concurrent
import Control.Monad
import Data.Time
main :: IO ()
main = mapM_ delay (0 : take 7 (iterate (*5) 100))
delay :: Int -> IO ()
delay n = do
tS <- getCurrentTime
threadDelay n
tE <- getCurrentTime
let req = fromIntegral n * 10 ^ (6 :: Int)
obs = floor (diffUTCTime tE tS * 10 ^ (12 :: Int))
diff = obs - req
diff' :: Double
diff' = fromIntegral diff / 10 ^ (12 :: Int)
when (obs < req) $ print (tS, tE, req, obs, diff, diff')
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