-- #hide
module GHC.TopHandler (
- runMainIO, runIO, runNonIO, reportStackOverflow, reportError
+ runMainIO, runIO, runIOFastExit, runNonIO, reportStackOverflow, reportError
) where
import Prelude
import System.IO
import Control.Exception
+import Foreign.C ( CInt )
import GHC.IOBase
import GHC.Exception
import GHC.Prim (unsafeCoerce#)
runIO :: IO a -> IO a
runIO main = catchException main topHandler
+-- | Like 'runIO', but in the event of an exception that causes an exit,
+-- we don't shut down the system cleanly, we just exit. This is
+-- useful in some cases, because the safe exit version will give other
+-- threads a chance to clean up first, which might shut down the
+-- system in a different way. For example, try
+--
+-- main = forkIO (runIO (exitWith (ExitFailure 1))) >> threadDelay 10000
+--
+-- This will sometimes exit with "interrupted" and code 0, because the
+-- main thread is given a chance to shut down when the child thread calls
+-- safeExit. There is a race to shut down between the main and child threads.
+--
+runIOFastExit :: IO a -> IO a
+runIOFastExit main = catchException main topHandlerFastExit
+ -- NB. this is used by the testsuite driver
+
-- | The same as 'runIO', but for non-IO computations. Used for
-- wrapping @foreign export@ and @foreign import \"wrapper\"@ when these
-- are used to export Haskell functions with non-IO types.