test-suite/tests/continuations.test

   1 ;;;;                                                          -*- scheme -*-
   2 ;;;; continuations.test --- test suite for continutations
   3 ;;;;
   4 ;;;; Copyright (C) 2003 Free Software Foundation, Inc.
   5 ;;;;
   6 ;;;; This program is free software; you can redistribute it and/or modify
   7 ;;;; it under the terms of the GNU General Public License as published by
   8 ;;;; the Free Software Foundation; either version 2, or (at your option)
   9 ;;;; any later version.
  10 ;;;;
  11 ;;;; This program is distributed in the hope that it will be useful,
  12 ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 ;;;; GNU General Public License for more details.
  15 ;;;;
  16 ;;;; You should have received a copy of the GNU General Public License
  17 ;;;; along with this software; see the file COPYING.  If not, write to
  18 ;;;; the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  19 ;;;; Boston, MA 02110-1301 USA
  20
  21 (define-module (test-suite test-continuations)
  22   :use-module (test-suite lib))
  23
  24 (define (block-reentry body)
  25   (let ((active #f))
  26     (dynamic-wind
  27         (lambda ()
  28           (if active
  29               (throw 'no-reentry)))
  30         (lambda ()
  31           (set! active #t)
  32           (body))
  33         (lambda () #f))))
  34
  35 (define (catch-tag body)
  36   (catch #t
  37          body
  38          (lambda (tag . args) tag)))
  39
  40 (define (check-cont)
  41   (catch-tag
  42    (lambda ()
  43      (block-reentry (lambda () (call/cc identity))))))
  44
  45 (define (dont-crash-please)
  46   (let ((k (check-cont)))
  47     (if (procedure? k)
  48         (k 12)
  49         k)))
  50
  51 (with-test-prefix "continuations"
  52
  53   (pass-if "throwing to a rewound catch context"
  54     (eq? (dont-crash-please) 'no-reentry))
  55
  56   (let ((dopts (debug-options)))
  57     (debug-enable 'debug)
  58
  59     (pass-if "make a stack from a continuation"
  60       (stack? (call-with-current-continuation make-stack)))
  61
  62     (pass-if "get a continuation's stack ID"
  63       (let ((id (call-with-current-continuation stack-id)))
  64         (or (boolean? id) (symbol? id))))
  65
  66     (pass-if "get a continuation's innermost frame"
  67       (pair? (call-with-current-continuation last-stack-frame)))
  68
  69     (debug-options dopts))
  70
  71 )