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;; dislfuid, implementation of the Solid specification
;; Copyright (C) 2021 Vivien Kraus
;; This program is free software: you can redistribute it and/or modify
;; it under the terms of the GNU Affero General Public License as
;; published by the Free Software Foundation, either version 3 of the
;; License, or (at your option) any later version.
;; This program is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU Affero General Public License for more details.
;; You should have received a copy of the GNU Affero General Public License
;; along with this program. If not, see <https://www.gnu.org/licenses/>.
(define-module (webid-oidc offloading)
#:use-module (ice-9 threads)
#:declarative? #t
#:export (with-threads in-another-thread))
(define tag (make-prompt-tag))
(define (let-threads-escape thunk)
(call-with-prompt tag
(lambda ()
(thunk))
(lambda (k handle-continuation)
(handle-continuation k))))
(define (continue-in-another-thread thunk)
(abort-to-prompt
tag
(lambda (continuation)
(call-with-new-thread
(lambda ()
(let-threads-escape
(lambda ()
(call-with-values
thunk
continuation))))))))
(define-syntax-rule (with-threads body ...)
(let-threads-escape
(lambda () body ...)))
(define-syntax-rule (in-another-thread body ...)
(continue-in-another-thread
(lambda () body ...)))
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