Correction: It's not Mac vs Linux, it's Racket BC (works) vs CS (doesn't work)
On Sun, May 10, 2020 at 9:49 AM Laurent <laurent.ors...@gmail.com> wrote: > Hi all, > > We're trying to figure out why the last case below doesn't work on > Linux, but works on MacOS. Does anyone have an explanation? > The docs suggest that _double* shouldn't be different from _double for > _reading_ values. > > More precisely, > > #lang racket > (require ffi/unsafe) > > (define N 10) > (define pt (malloc N _double 'atomic-interior)) > (for ([i (in-range N)]) > (ptr-set! pt _double* i (+ 2. i))) > > ;; works > (for/list ([i (in-range N)]) > (ptr-ref pt _double i)) > > ;; works > (for/list ([i (in-range N)]) > (ptr-ref (ptr-add pt i _double) _double*)) > > ;; doesn't work! > (for/list ([i (in-range N)]) > (ptr-ref (ptr-add pt i _double) _double)) > > ------ > Output: > (2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0) > (2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0 11.0) > (2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0 2.0) > > -- You received this message because you are subscribed to the Google Groups "Racket Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to racket-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/racket-users/CABNTSaFmfgTpTrWzfcxL%2BxQCqtge5Ls1eKW%2Bp0ftd%3D0q554ALg%40mail.gmail.com.
