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3e529bf02a
* module/ice-9/futures.scm (%futures-waiting, %within-future?,
%future-prompt): New variables.
(let/ec): New macro.
(process-future!): Run FUTURE's thunk in a prompt; capture FUTURE's
continuation when it aborts, and add it to %FUTURES-WAITING. Set
%WITHIN-FUTURE? in the dynamic extent of the call FUTURE's thunk.
(process-futures): Move loop body to...
(process-one-future): ... here. New procedure.
(notify-completion): New procedure.
(touch)[work, loop]: New procedures.
When %WITHIN-FUTURE? and FUTURE is started, abort; if not
%WITHIN-FUTURE, call `work' while waiting.
When FUTURE is queued, call `work' too.
* test-suite/tests/future.test ("nested futures"): New tests.
108 lines
3.5 KiB
Scheme
108 lines
3.5 KiB
Scheme
;;;; future.test --- Futures. -*- mode: scheme; coding: utf-8; -*-
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;;;;
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;;;; Ludovic Courtès <ludo@gnu.org>
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;;;;
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;;;; Copyright (C) 2010, 2012 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-future)
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#:use-module (test-suite lib)
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#:use-module (ice-9 futures)
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#:use-module (srfi srfi-1)
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#:use-module (srfi srfi-26)
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#:use-module (system base compile))
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(define specific-exception-key (gensym))
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(define specific-exception
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(cons specific-exception-key ".*"))
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(with-test-prefix "futures"
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(pass-if "make-future"
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(future? (make-future (lambda () #f))))
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(pass-if "future"
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(future? (future #t)))
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(pass-if "true"
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(touch (future #t)))
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(pass-if "(+ 2 3)"
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(= 5 (touch (future (+ 2 3)))))
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(pass-if "many"
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(equal? (iota 1234)
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(map touch
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(map (lambda (i)
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(make-future (lambda () i)))
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(iota 1234)))))
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(pass-if "touch several times"
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(let* ((f+ (unfold (cut >= <> 123)
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(lambda (i)
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(make-future
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(let ((x (1- i)))
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(lambda ()
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(set! x (1+ x))
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i))))
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1+
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0))
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(r1 (map touch f+))
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(r2 (map touch f+))
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(r3 (map touch f+)))
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(equal? (iota 123) r1 r2 r3)))
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(pass-if "nested"
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(= (touch (future (+ 2 (touch (future -2))
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(reduce + 0
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(map touch
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(map (lambda (i)
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(future i))
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(iota 123)))))))
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(reduce + 0 (iota 123))))
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(pass-if "multiple values"
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(let ((lst (iota 123)))
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(equal? (zip lst lst)
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(map (lambda (f)
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(call-with-values (cut touch f) list))
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(map (lambda (i)
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(future (values i i)))
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lst)))))
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(pass-if "no exception"
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(future? (future (throw 'foo 'bar))))
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(pass-if-exception "exception"
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specific-exception
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(touch (future (throw specific-exception-key 'test "thrown!")))))
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(with-test-prefix "nested futures"
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(pass-if-equal "simple" 2
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(touch (future (1+ (touch (future (1+ (touch (future 0)))))))))
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(pass-if-equal "loop" (map - (iota 1000))
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;; Compile to avoid stack overflows.
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(compile '(let loop ((list (iota 1000)))
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(if (null? list)
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'()
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(cons (- (car list))
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(touch (future (loop (cdr list)))))))
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#:to 'value
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#:env (current-module))))
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