Re: [Haskell-cafe] synchronous channels in STM

On Thu, Oct 9, 2008 at 1:50 AM, roger peppe wrote:

On Thu, Oct 9, 2008 at 9:15 AM, Ryan Ingram wrote:

...

I don't think what you want is possible if both sides are in STM. Other authors have posted solutions where one side or the other of the transaction is in I/O, but wholly inside STM it's not possible.

Thanks, that's what I thought, although I wasn't sure of it, being new to both Haskell and STM.

Presumably this result means that it's not possible to implement any bounded-buffer-type interface within (rather than on top of) STM.

Isn't that a rather serious restriction?

I don't know that it's practically-speaking that serious. One can write it in IO, using STM. I think of CSP as I/O anyway, but perhaps my thinking is flawed and dirty from MPI and Erlang "message passing" :-). Then again, I'm not sure why keeping it in STM is even valuable really. IO gets the job done right?

cheers, rog. _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe