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;;;; asyncs.test -*- mode: scheme; coding: utf-8; -*-
;;;;
;;;; Copyright (C) 2016 Free Software Foundation, Inc.
;;;;
;;;; This library is free software; you can redistribute it and/or
;;;; modify it under the terms of the GNU Lesser General Public
;;;; License as published by the Free Software Foundation; either
;;;; version 3 of the License, or (at your option) any later version.
;;;;
;;;; This library 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
;;;; Lesser General Public License for more details.
;;;;
;;;; You should have received a copy of the GNU Lesser General Public
;;;; License along with this library; if not, write to the Free Software
;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
(define-module (test-asyncs)
#:use-module (ice-9 control)
#:use-module (ice-9 q)
#:use-module (ice-9 atomic)
#:use-module (ice-9 threads)
#:use-module (test-suite lib))
(with-test-prefix "interrupts"
(pass-if-equal "self-interruptable v1" 42
(let/ec break
(let lp ((n 0))
(when (= n 10)
(system-async-mark (lambda () (break 42))))
(lp (1+ n)))))
(pass-if-equal "self-interruptable v2" 42
(let/ec break
(begin
(system-async-mark (lambda () (break 42)))
(let lp () (lp))))))
(define (with-sigprof-interrupts hz interrupt proc)
(let ((prev-handler #f)
(period-usecs (inexact->exact (round (/ 1e6 hz)))))
(define (profile-signal-handler _) (interrupt))
(dynamic-wind
(lambda ()
(set! prev-handler (car (sigaction SIGPROF profile-signal-handler)))
(setitimer ITIMER_PROF 0 period-usecs 0 period-usecs))
proc
(lambda ()
(setitimer ITIMER_PROF 0 0 0 0)
(sigaction SIGPROF prev-handler)))))
(when (defined? 'setitimer)
(pass-if "preemption via sigprof"
;; Use an atomic box as a compiler barrier.
(let* ((box (make-atomic-box 0))
(preempt-tag (make-prompt-tag))
(runqueue (make-q)))
(define (run-cothreads)
(unless (q-empty? runqueue)
(let ((k (deq! runqueue)))
(call-with-prompt preempt-tag
k
(lambda (k) (enq! runqueue k))))
(run-cothreads)))
(enq! runqueue (lambda ()
(let lp ()
(let ((x (atomic-box-ref box)))
(unless (= x 100)
(when (even? x)
(atomic-box-set! box (1+ x)))
(lp))))))
(enq! runqueue (lambda ()
(let lp ()
(let ((x (atomic-box-ref box)))
(unless (= x 100)
(when (odd? x)
(atomic-box-set! box (1+ x)))
(lp))))))
(with-sigprof-interrupts
1000 ; Hz
(lambda ()
;; Could throw an exception if the prompt is
;; not active (i.e. interrupt happens
;; outside running a cothread). Ignore in
;; that case.
(false-if-exception (abort-to-prompt preempt-tag)))
run-cothreads)
(equal? (atomic-box-ref box) 100))))
(when (provided? 'threads)
(pass-if "preemption via external thread"
;; Use an atomic box as a compiler barrier.
(let* ((box (make-atomic-box 0))
(preempt-tag (make-prompt-tag))
(runqueue (make-q)))
(define (run-cothreads)
(unless (q-empty? runqueue)
(let ((k (deq! runqueue)))
(call-with-prompt preempt-tag
k
(lambda (k) (enq! runqueue k))))
(run-cothreads)))
(enq! runqueue (lambda ()
(let lp ()
(let ((x (atomic-box-ref box)))
(unless (= x 100)
(when (even? x)
(atomic-box-set! box (1+ x)))
(lp))))))
(enq! runqueue (lambda ()
(let lp ()
(let ((x (atomic-box-ref box)))
(unless (= x 100)
(when (odd? x)
(atomic-box-set! box (1+ x)))
(lp))))))
(let* ((main-thread (current-thread))
(preempt-thread (call-with-new-thread
(lambda ()
(let lp ()
(unless (= (atomic-box-ref box) 100)
(usleep 1000)
(system-async-mark
(lambda ()
;; Could throw an exception if the
;; prompt is not active
;; (i.e. interrupt happens outside
;; running a cothread). Ignore in
;; that case.
(false-if-exception
(abort-to-prompt preempt-tag)))
main-thread)
(lp)))))))
(run-cothreads)
(join-thread preempt-thread)
(equal? (atomic-box-ref box) 100)))))
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