[Haskell-cafe] Profiling and Threading: never the twain shall meet

[Dougal Stanton]

Hi Haskellers,

It seems that profiling and threading are not supported at the same
time in GHC6.6. At least, it objects to using both the flags at the
same time, and there's a Trac entry for that issue.

So I just wanted to be sure that I really need threading. I'm passing
text through some filters written in perl, just ordinary command line
programs. I do it like this:

> do
>   (hin, hout, herr, ph) <- runInteractiveProcess cmd args Nothing Nothing
>   forkIO $ hPutStr hin content >> hClose hin
>   out <- hGetContents hout
>   return (ph, out)

which seems to require threading. If I compile without, it will hang
indefinitely, I presume deadlocked. Is there a way this can be done
without threading?

But it's not a great issue for me if I can't do profiling in this
case. I just wanted to try out the feature, and it seemed worthwhile
checking I was doing this right.

Cheers,

Dougal.