You can do it almost transparently with  the Workflow package::

http://hackage.haskell.org/package/Workflow


2009/2/11 Cristiano Paris <cristiano.paris@gmail.com>

On Wed, Feb 11, 2009 at 2:30 PM, Peter Verswyvelen <bugfact@gmail.com> wrote:
> I haven't looked at the details, but I think this is what a library like
> Reactive from Conal Elliott could do, but as far as I understand it, it is
> still work in progress.

I'm interested in the possibility of
stopping/pickling/unpickling/resuming a computation.

Cristiano
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