Hi, Daniel Hartwig <mand...@gmail.com> skribis:
> On 7 October 2012 05:41, Ludovic Courtès <l...@gnu.org> wrote: >> Hi, >> >> Daniel Hartwig <mand...@gmail.com> skribis: >> >>> (define x (bytevector->pointer (make-bytevector len 1))) >>> (define a (pointer-address x)) >>> (display x)(newline) >>> (my-guardian x) >>> ;(my-guardian (pointer->bytevector x len)) >>> (set! x #f) >>> >>> (define (dump-struct) >>> (write (pointer->bytevector (make-pointer a) len))(newline)) >> >> This is expected to fail: ‘bytevector->pointer’ creates a weak reference >> from the returned pointer object to the given bytevector. So when the >> pointer object is reclaimed, the bytevector can be reclaimed too, hence >> the problem you’re observing. (And no, guardians don’t protect objects >> from garbage collection.) > > If I understand correctly, there is never any non-weak reference to > the bv above and so it can be collected at any time. There’s a weak reference from the pointer object to the bytevector. Once that pointer object has been collected (as in the example above), the bytevector can be collected anytime. Thanks, Ludo’.
