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e309f3bf9e
* libguile/continuations.c (scm_handler, c_handler)
(scm_c_with_continuation_barrier, scm_with_continuation_barrier):
Instead of calling scm_handle_by_message_noexit in the pre-unwind
handler, roll our own exception printing in the pre-unwind, and do to
exit()-on-quit in the post-unwind handler. This lets the stack unwind
at exit-time so that pending dynwinds run.
* test-suite/tests/continuations.test ("continuations"): Add a test.
103 lines
3 KiB
Scheme
103 lines
3 KiB
Scheme
;;;; -*- scheme -*-
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;;;; continuations.test --- test suite for continutations
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;;;;
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;;;; Copyright (C) 2003, 2006, 2009, 2011 Free Software Foundation, Inc.
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;;;;
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;;;; This library is free software; you can redistribute it and/or
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;;;; modify it under the terms of the GNU Lesser General Public
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;;;; License as published by the Free Software Foundation; either
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;;;; version 3 of the License, or (at your option) any later version.
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;;;;
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;;;; This library is distributed in the hope that it will be useful,
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;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;;;; Lesser General Public License for more details.
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;;;;
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;;;; You should have received a copy of the GNU Lesser General Public
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;;;; License along with this library; if not, write to the Free Software
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;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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(define-module (test-suite test-continuations)
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:use-module (test-suite lib))
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(define (block-reentry body)
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(let ((active #f))
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(dynamic-wind
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(lambda ()
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(if active
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(throw 'no-reentry)))
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(lambda ()
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(set! active #t)
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(body))
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(lambda () #f))))
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(define (catch-tag body)
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(catch #t
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body
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(lambda (tag . args) tag)))
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(define (check-cont)
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(catch-tag
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(lambda ()
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(block-reentry (lambda () (call/cc identity))))))
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(define (dont-crash-please)
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(let ((k (check-cont)))
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(if (procedure? k)
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(k 12)
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k)))
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(with-test-prefix "continuations"
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(pass-if "throwing to a rewound catch context"
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(eq? (dont-crash-please) 'no-reentry))
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(pass-if "can print a continuation"
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(let ((s (with-output-to-string
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(lambda ()
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(call-with-current-continuation write)))))
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(string=? "#<continuation " (substring s 0 15))))
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(pass-if "blocked attempt to cross a continuation barrier"
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(call-with-current-continuation
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(lambda (k)
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(with-continuation-barrier
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(lambda ()
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(catch 'misc-error
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(lambda ()
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(k 1)
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#f)
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(lambda _
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#t)))))))
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(pass-if "uncaught exception is handled by continuation barrier"
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(let* ((handled #f)
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(s (with-error-to-string
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(lambda ()
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(set! handled
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(not (with-continuation-barrier
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(lambda ()
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(error "Catch me if you can!")))))))))
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handled))
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(pass-if "exit unwinds dynwinds inside a continuation barrier"
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(let ((s (with-error-to-string
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(lambda ()
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(with-continuation-barrier
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(lambda ()
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(dynamic-wind
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(lambda () #f)
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(lambda () (exit 1))
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(lambda () (throw 'abcde)))))))))
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(and (string-contains s "abcde") #t)))
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(with-debugging-evaluator
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(pass-if "make a stack from a continuation"
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(stack? (call-with-current-continuation make-stack)))
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(pass-if "get a continuation's stack ID"
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(let ((id (call-with-current-continuation stack-id)))
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(or (boolean? id) (symbol? id)))))
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)
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