    {-# LANGUAGE ForeignFunctionInterface #-}
    {-# LANGUAGE MagicHash                #-}
    {-# LANGUAGE TemplateHaskell          #-}
    {-# LANGUAGE UnliftedFFITypes         #-}
    {-# OPTIONS_GHC -fno-warn-orphans #-}
    {-|
    Module:      TextShow.Control.Concurrent
    Copyright:   (C) 2014-2017 Ryan Scott
    License:     BSD-style (see the file LICENSE)
    Maintainer:  Ryan Scott
    Stability:   Provisional
    Portability: GHC

    'TextShow' instances for concurrency-related data types.

    /Since: 2/
    -}
    module TextShow.Control.Concurrent () where

    import Data.Monoid.Compat ((<>))
    import Data.Text.Lazy.Builder (fromString)

    import Foreign.C.Types

    import GHC.Conc (BlockReason, ThreadStatus)
    import GHC.Conc.Sync (ThreadId(..))
    import GHC.Prim

    import TextShow.Classes (TextShow(..))
    import TextShow.Foreign.C.Types ()
    import TextShow.TH.Internal (deriveTextShow)

    -- | /Since: 2/
    instance TextShow ThreadId where
        showbPrec p t = fromString "ThreadId " <> showbPrec p (getThreadId t)
        {-# INLINE showbPrec #-}

    -- Temporary workaround until Trac #8281 is fixed
    foreign import ccall unsafe "rts_getThreadId" getThreadId# :: Addr# -> CInt

    getThreadId :: ThreadId -> CInt
    getThreadId (ThreadId tid) = getThreadId# (unsafeCoerce# tid)

    -- | /Since: 2/
    $(deriveTextShow ''ThreadStatus)
    -- | /Since: 2/
    $(deriveTextShow ''BlockReason)