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module Monitor (monitor, labelMe) where
import Control.Monad
import Data.List
import Data.Maybe
import GHC.Conc.Sync
monitor :: IO () -> IO ()
monitor action = do
labelMe "monitor"
forever $ do
action
threadSummary >>= mapM_ (putStrLn . showT)
putStr "\n"
where
showT (i, l, s) = i ++ " " ++ l ++ ": " ++ show s
threadSummary :: IO [(String, String, ThreadStatus)]
threadSummary = (sort <$> listThreads) >>= mapM summary
where
summary t = do
let idstr = drop 9 $ show t
l <- fromMaybe "(no name)" <$> threadLabel t
s <- threadStatus t
return (idstr, l, s)
labelMe :: String -> IO ()
labelMe lbl = do
tid <- myThreadId
labelThread tid lbl
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