At Fri, 3 May 2013 12:17:46 -0400, Eli Barzilay wrote: > > A few minutes ago, Vincent St-Amour wrote: > > At Fri, 3 May 2013 11:56:02 -0400, Eli Barzilay wrote: > > > (define (delay/thread thunk) > > > (let () > > > (define p (make-promise/thread #f)) > > > (pset! p (make-running-thread (thread (λ() ...same...)))) > > > p)) > > > > I think that introduces another race condition. > > > > If the thread is forced before the `pset!', then `force' would > > return #f (line 107 of racket/promise.rkt), since the value inside > > the `promise/thread' is not a thread. > > But this can't happen because `delay/thread' won't return with the > broken promise until after the `pset!' fixed it. > > (Even code in the input thunk will not be able to try to force itself > without having itself accessible as a value.)
Makes sense. I'll give it a try. Vincent _________________________ Racket Developers list: http://lists.racket-lang.org/dev
