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logger.hs
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logger.hs
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import Network
import System.IO
import Control.Exception
import Control.Concurrent
import Control.Concurrent.MVar
import Control.Monad
import Control.Monad.Fix (fix)
type Msg = (Int, String)
filename = "primes.log"
main :: IO ()
main = do
chan <- newEmptyMVar
-- sock <- socket AF_INET Stream 0
-- setSocketOption sock ReuseAddr 1
-- bindSocket sock (SockAddrInet 4242 iNADDR_ANY)
-- listen sock 2
sock <- listenOn $ PortNumber 4242
reader <- forkIO $ fix $ \loop -> do
(nr', line) <- takeMVar chan
putStrLn $ "Results returned from slave " ++ show nr'
appendFile filename (line ++ "\n")
loop
mainLoop sock chan 0
mainLoop :: Socket -> MVar (Msg) -> Int -> IO ()
mainLoop sock chan nr = do
(handle, _, _) <- accept sock
hSetBuffering handle NoBuffering
forkIO $ runConn handle chan nr
mainLoop sock chan $! nr+1
runConn :: Handle -> MVar (Msg) -> Int -> IO ()
runConn hdl chan nr = do
let broadcast msg = putMVar chan (nr, msg)
handle (\(SomeException _) -> return ()) $ fix $ \loop -> do
line <- hGetLine hdl
broadcast line
loop
hClose hdl