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{-# LANGUAGE MagicHash #-}
{-# LANGUAGE UnboxedTuples #-}
module Main (main) where
import GHC.Exts
import GHC.Int
import GHC.IO
import Control.Concurrent (threadDelay)
import System.Mem (performMajorGC)
import Control.Monad (mapM_, replicateM)
data ByteArray = BA (MutableByteArray# RealWorld)
newByteArray :: Int -> IO ByteArray
newByteArray (I# n) = IO $ \s ->
case {-# SCC suzanne #-} newPinnedByteArray# n s of
(# s', ba# #) -> (# s', BA ba# #)
writeByteArray :: Int -> Int -> ByteArray -> IO ()
writeByteArray (I# offset) (I# n) (BA ba#) = IO $ \s ->
case writeIntArray# ba# offset n s of
s' -> (# s', () #)
main :: IO ()
main = do
bas <- {-# SCC robert #-} mapM (\n -> newByteArray (100*n)) [0..1000]
mapM_ doSomething [0..4]
mapM_ (writeByteArray 0 42) bas
doSomething :: Int -> IO ()
doSomething n = do
threadDelay (1000*1000)
print n
performMajorGC
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