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|
{-# LANGUAGE FlexibleContexts #-}
module Control.Concurrent.Lifted.Instrument
( module Control.Concurrent.Lifted
, forkIO
, forkOS
, fork
, labelThread
, threadsInformation
, PerThread(..)
) where
import qualified Control.Concurrent.Lifted as Raw
import Control.Concurrent.Lifted hiding (fork,forkOS)
import Control.Exception (fromException)
import Control.Monad.Trans.Control
import System.IO.Unsafe
import qualified Data.Map.Strict as Map
import Control.Exception.Lifted
import Control.Monad.Base
import qualified GHC.Conc as GHC
import Data.Time()
import Data.Time.Clock
import System.IO
import Control.Monad.IO.Class
data PerThread = PerThread
{ lbl :: String
, startTime :: UTCTime
}
deriving (Eq,Ord,Show)
data GlobalState = GlobalState
{ threads :: !(Map.Map ThreadId PerThread)
, reportException :: String -> IO ()
}
globals :: MVar GlobalState
globals = unsafePerformIO $ newMVar $ GlobalState
{ threads = Map.empty
, reportException = hPutStrLn stderr
}
{-# NOINLINE globals #-}
forkIO :: IO () -> IO ThreadId
forkIO = fork
{-# INLINE forkIO #-}
forkOS :: MonadBaseControl IO m => m () -> m ThreadId
forkOS = instrumented Raw.forkOS
{-# INLINE forkOS #-}
fork :: MonadBaseControl IO m => m () -> m ThreadId
fork = instrumented Raw.fork
{-# INLINE fork #-}
instrumented :: MonadBaseControl IO m =>
(m () -> m ThreadId) -> m () -> m ThreadId
instrumented rawFork action = do
t <- rawFork $ do
tid <- myThreadId
tm <- liftBase getCurrentTime
bracket_ (modifyThreads $! Map.insert tid (PerThread "" tm))
(return ())
$ do catch action $ \e -> case fromException e of
Just ThreadKilled -> return ()
Nothing -> liftBase $ do
g <- takeMVar globals
let l = concat [ show e
, " ("
, maybe "" lbl $ Map.lookup tid (threads g)
, ")"
]
reportException g l
putMVar globals $! g { threads = Map.insert tid (PerThread l tm) $ threads g }
throwIO e
-- Remove the thread only if it terminated normally or was killed.
modifyThreads $! Map.delete tid
return t
labelThread :: ThreadId -> String -> IO ()
labelThread tid s = do
GHC.labelThread tid s
modifyThreads $! Map.adjust (\pt -> pt { lbl = s }) tid
{-# INLINE labelThread #-}
threadsInformation :: IO [(ThreadId,PerThread)]
threadsInformation = do
m <- threads <$> readMVar globals
return $ Map.toList m
modifyThreads :: MonadBase IO m => (Map.Map ThreadId PerThread -> Map.Map ThreadId PerThread) -> m ()
modifyThreads f = do
g <- takeMVar globals
let f' st = st { threads = f (threads st) }
putMVar globals $! f' g
|
