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bug#59021: Unbounded heap growth when combining dynamic states & delimit
From: |
Ludovic Courtès |
Subject: |
bug#59021: Unbounded heap growth when combining dynamic states & delimited continuation |
Date: |
Fri, 04 Nov 2022 19:24:50 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/28.1 (gnu/linux) |
(This is a followup to <https://github.com/wingo/fibers/issues/65>,
itself a followup to <https://issues.guix.gnu.org/58631>.)
Consider this code:
--8<---------------cut here---------------start------------->8---
;; https://issues.guix.gnu.org/58631
;; https://github.com/wingo/fibers/issues/65
(define loss
(make-vector 1000000))
(let ((tag (make-prompt-tag "my prompt")))
(define handler
(lambda (k i)
(when (zero? (modulo i 2000000))
(pk 'heap-size (assoc-ref (gc-stats) 'heap-size)))
(call-with-prompt tag
(lambda ()
(k (modulo (+ 1 i) 10000000)))
handler)))
(call-with-prompt tag
(let ((state (current-dynamic-state)))
(lambda ()
;; (define (with-dynamic-state state thunk)
;; (let ((previous #f))
;; (dynamic-wind
;; (lambda () (set! previous (set-current-dynamic-state state)))
;; thunk
;; (lambda () (set-current-dynamic-state previous)))))
(with-dynamic-state state
(lambda ()
(let loop ((i 0))
(loop (abort-to-prompt tag i)))))))
handler))
--8<---------------cut here---------------end--------------->8---
On Guile 3.0.8, this program exhibits seemingly unbounded heap growth.
Uncommenting the local ‘with-dynamic-state’ definition fixes the
problem.
Ludo’.
- bug#59021: Unbounded heap growth when combining dynamic states & delimited continuation,
Ludovic Courtès <=