threads-0.5.0.1: Control/Concurrent/Raw.hs

{-# LANGUAGE UnicodeSyntax, NoImplicitPrelude, MagicHash, UnboxedTuples #-}

module Control.Concurrent.Raw ( rawForkIO, rawForkOn ) where

import Data.Function ( ($) )
import GHC.IO        ( IO(IO) )
import GHC.Exts      ( Int(I#), fork#, forkOn# )
import GHC.Conc      ( ThreadId(ThreadId) )

-- A version of forkIO that does not include the outer exception
-- handler: saves a bit of time when we will be installing our own
-- exception handler.
{-# INLINE rawForkIO #-}
rawForkIO ∷ IO () → IO ThreadId
rawForkIO action = IO $ \s →
   case (fork# action s) of (# s1, tid #) → (# s1, ThreadId tid #)

{-# INLINE rawForkOn #-}
rawForkOn ∷ Int → IO () → IO ThreadId
rawForkOn (I# cpu) action = IO $ \s →
   case (forkOn# cpu action s) of (# s1, tid #) → (# s1, ThreadId tid #)