[Haskell-cafe] FFI woes!

[Sebastian Sylvan]

On Thu, 16 Dec 2004 08:46:58 +0000, Ben Rudiak-Gould
<Benjamin.Rudiak-Gould at cl.cam.ac.uk> wrote:
> Sebastian Sylvan wrote:
> 
>  >If there was a way to simply defer GC (like you attatch a function to
>  >an object which can simply deny the GC the right to remove it
>  >depending on its state) then I wouldn't have to do anything
>  >significant in the finalizer.
> 
> Why not spawn a thread which starts the playback, waits for it to
> finish, and then exits, and wrap the whole thread in a call to
> withForeignPtr? Then your finalizer won't be called prematurely.

Well I could do this, but for one it would be cumbersome to stop
playback. I could, of course, return some sort of Playback datatype
which contains a Chan that can be written to with some commands, and
then have the playback-loop (spawned with a forkIO) check this
periodically and apply the commands to the "real" playback channel.
However I'd need a pretty tight polling-loop to get these commands
responsive, and that just seems like a waste of processing power.


/S

-- 
Sebastian Sylvan
+46(0)736-818655
UIN: 44640862