Haskell - STM example using two threads and a TChan to communicate between the threads

stmtchan.hs

module Main (main) where

import Data.Maybe
import Control.Applicative
import Control.Monad
import Control.Concurrent
import Control.Concurrent.STM.TChan
import GHC.Conc
import System.Random

readQ = atomically . readTChan
writeQ ch v = atomically $ writeTChan ch v

main :: IO ()
main = do
    queue <- atomically $ newTChan
    readerThread queue
    loop queue 0
    where loop queue v = (getStdRandom $ randomR (100000,10000000)) >>= threadDelay >> writeQ queue v >> loop queue (v+1)

readerThread :: TChan Integer -> IO ThreadId
readerThread queue = forkIO loop
    where loop = readQ queue >>= putStrLn . (\s -> "Received: " ++ s) . show >> loop