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{-# OPTIONS_GHC -fno-full-laziness -fno-cse #-}
module AtomicPrint (
atomicPrint, atomicPrintS,
atomicPrintNoWait, atomicPrintNoWaitS,
) where
import Control.Concurrent
import Control.Monad (void)
import Data.Text qualified as T
import Data.Text.IO.Utf8 qualified as T
import Data.Text (Text)
import System.IO
import System.IO.Unsafe (unsafePerformIO)
{-# NOINLINE mutex #-}
mutex :: MVar ()
mutex = unsafePerformIO (newMVar ())
atomicPrintS :: String -> IO ()
atomicPrintS = atomicPrint . T.pack
atomicPrint :: Text -> IO ()
atomicPrint text =
withMVar mutex $ \() ->
T.putStrLn text >> hFlush stdout
atomicPrintNoWaitS :: String -> IO ()
atomicPrintNoWaitS = atomicPrintNoWait . T.pack
-- | Does not block, so if you've masked exceptions, nothing will come through here
atomicPrintNoWait :: Text -> IO ()
atomicPrintNoWait text = void $ forkIO $ atomicPrint text
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