On 31.07 14:03, Thomas Conway wrote: > This is why I believe transaction-local variables are a more useful concept. > You are garanteed that there is only one thread accessing them, and > they behave just like ordinary TVars except that each transaction has > its own copy.
This seems like it could be useful. E.g. marking graph nodes while traversing them. > The argument to newLVar is an initial value that is used at the start > of each transaction. Note that this means that the value in an LVar > does not persist between transaction. I agree that this limits their > use, but simplifies them immensely, and doesn't stand in the way their > being useful for solving a bunch of problems. I think that them "reverting" to the initial value is more useful than persisting behavior. - Einar Karttunen _______________________________________________ Haskell mailing list Haskell@haskell.org http://www.haskell.org/mailman/listinfo/haskell
