I think what's happening is that you're creating a place whose first action is to create that same place again (over and over).
Robby On Mon, Aug 29, 2011 at 8:17 PM, David Mitchell <d...@fallingcanbedeadly.com> wrote: > I've been trying to experiment with racket/place, but it seems to have > significant incompatibilities with DrRacket. I've defined a module based on > a code snippet in http://www.cs.utah.edu/plt/publications/dls11-tsffd.pdf > that looks like this: > > #lang racket > (provide all-defined-out) > (define (fib n) > (define (fib-inner n-remaining i i+1) > (if (= n-remaining 1) > i+1 > (fib-inner (- n-remaining 1) i+1 (+ i i+1)))) > (if (<= n 0) > 0 > (fib-inner n 0 1))) > (define (start-fib n) > (define p > (place ch > (define n (place-channel-get ch)) > (place-channel-put ch (fib n)))) > (place-channel-put p n) > p) > (define (super-simple) > (define p > (place ch > (place-channel-put ch 5))) > (place-channel-get p)) > > If I run racket in my Terminal and load this module, I'm able to use > start-fib and super-simple as expected. However, if I define this module in > the DrRacket editor and access the functions through the repl, attempts to > receive data from either place appear to hang. I'm running OS X Lion, and > I've tried both the 64-bit and 32-bit versions of 5.1.3, as well as the > 64-bit version of the latest nightly build (5.1.3.6--2011-08-28(46a0fe9/a)). > I posted a question about this to the IRC channel last night, and one other > user (jonrafkind) indicated that that the issue could be reproduced on > 32-bit Linux, so it seems unlikely to be a platform issue. This user also > indicated, "it seems places keeps reloading the current module." > (Unfortunately, I am quite new to racket, so I have only a vague idea what > this means, and no idea at all as to how one would go about discovering such > a thing) > Does anyone have any insight as to why this might be failing and/or how I > might work around it (without abandoning the GUI)? > _________________________________________________ > For list-related administrative tasks: > http://lists.racket-lang.org/listinfo/users > _________________________________________________ For list-related administrative tasks: http://lists.racket-lang.org/listinfo/users
