[Haskell-cafe] runInteractiveCommand: program ends before writing or reading all the output

Olivier Boudry olivier.boudry at gmail.com
Thu May 15 15:06:19 EDT 2008

On Thu, May 15, 2008 at 2:42 PM, Ronald Guida <oddron at gmail.com> wrote:

> It looks like a simple race condition to me.  You are using
> "waitForProcess pid" to wait for runInteractiveCommand to finish, but
> you don't seem to have anything that waits for createDefFile to
> finish.

Thanks Ronald,

As I could not find a function to wait on a ThreadId I used a MVar to
synchronize both threads.

>   sync <- newEmptyMVar
>   forkIO (createDefFile sync file out)
>   waitForProcess pid
>   takeMVar sync

and at the end of the forked thread:

>   putMVar sync ()

Is this normal or have I missed the `waitOnThreadId` function?

Thanks for all the comments received on this thread,

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