Re: [Haskell-cafe] system in forkIO

14 Sep 2008

      marcot:
...
Em Dom, 2008-09-14 às 16:07 -0300, Marco Túlio Gontijo e Silva escreveu:
...
Thanks, I got it to work running
threadWaitRead stdInput
before getChar.
Now I've got another problem:
...
import Control.Concurrent
import System.IO
import System.Process
...
main :: IO ()
main
  = do
    process <- runCommand "wget
http://ftp.br.debian.org/debian/pool/main/g/ghc6/ghc6_6.8.2-6_amd64.deb"
    forkIO
      $ putStrLn "fork"
      >> getChar >>= putChar
      >> terminateProcess process
    waitForProcess process
    return ()
Not even fork is shown.  Any hints?
Daemonic threads. When the main thread exits, everything exits. Check
the docs for Control.Concurrent.

You better use an MVar to ensure the main thread waits on its child.

-- Don

Re: [Haskell-cafe] system in forkIO

Don Stewart