David Barbour wrote: > Create an extra TVar Int for every `chunk` in the array (e.g every 256 > elements, tuned to your update patterns). Read-write it (increment it, be > sure to force evaluation) just before every time you write an element or > slice it or slice the array element.
Incrementing and forcing evaluation should not be necessary, a TVar () should be enough. I would be very much surprised if the internal STM machinery compares the actual _values_ of what is inside a TVar, I guess it just notes that a read or a write happened. Anyway, this is just a guess, I wonder if these details are documented somewhere... Cheers Ben _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
