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de29a26008
This fixes some indeterministic test failures for gnunet-scheme observed while
developing gnunet-scheme. The following checks were made:
All dependents compile for x86_64:
$ ./pre-inst-env guix build shepherd gnunet-scheme guix-build-coordinator nar-herder guix-data-service guile-fibers --system=x86_64-linux
Everything except guix-build-coordinator (which depends on the
non-cross-compilable sqitch) cross-compile from x86_64 to aarch64-linux-gnu:
$ ./pre-inst-env guix build shepherd gnunet-scheme nar-herder guile-fibers --system=x86_64-linux --target=aarch64-linux-gnu
I tried testing for reproducibility but the check phase took to long.
However, you can compare the hash you get against the hash I got:
$ ./pre-inst-env guix hash --serializer=nar $(./pre-inst-env guix build guile-fibers --no-grafts --system=x86_64-linux) 0qsaqx27b6q2s22h7y93417ijpkwl6gc1fhhck8aha6bvmawk5h0
I tried an emulated build for another architecture, but there the tests took
overly long.
There were no lint warnings for guile-fibers.
* gnu/packages/patches/guile-fibers-epoll-instance-is-dead.patch: New patch.
* gnu/local.mk (dist_patch_DATA): Register the patch.
* gnu/packages/guile-xyz.scm (guile-fibers)[source]{patches}: Use the patch.
Signed-off-by: Mathieu Othacehe <othacehe@gnu.org>
99 lines
3.5 KiB
Diff
99 lines
3.5 KiB
Diff
From 5db4077e9f5166033637d2af9532ec6144b85646 Mon Sep 17 00:00:00 2001
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From: Maxime Devos <maximedevos@telenet.be>
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Date: Thu, 30 Jun 2022 14:21:47 +0000
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Subject: [PATCH 1/2] Fix behaviour of 'epoll-wake!' after 'run-fibers'.
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This avoids the "epoll instance is dead" error noticed in
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GNUnet-Scheme's test suite, as reported at
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<https://github.com/wingo/fibers/issues/61>.
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A test is added in the next commit.
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This patch has been applied upstream, but there hasn't been
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a new release yet at time of writing.
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* fibers/epoll.scm (epoll-wake!)[dead]: Instead of throwing an error,
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just return #t.
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---
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fibers/epoll.scm | 8 +++++++-
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1 file changed, 7 insertions(+), 1 deletion(-)
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diff --git a/fibers/epoll.scm b/fibers/epoll.scm
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index d26db4d..eb63242 100644
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--- a/fibers/epoll.scm
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+++ b/fibers/epoll.scm
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@@ -1,6 +1,7 @@
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;; epoll
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;;;; Copyright (C) 2016 Andy Wingo <wingo@pobox.com>
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+;;;; Copyright (C) 2022 Maxime Devos <maximedevos@telenet.be>
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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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@@ -135,7 +136,12 @@ epoll wait (if appropriate)."
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('waiting
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(primitive-epoll-wake (fileno (epoll-wake-write-pipe epoll))))
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('not-waiting #t)
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- ('dead (error "epoll instance is dead"))))
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+ ;; This can happen if a fiber was waiting on a condition and
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+ ;; run-fibers completes before the fiber completes and afterwards
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+ ;; the condition is signalled. In that case, we don't have to
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+ ;; resurrect the fiber or something, we can just do nothing.
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+ ;; (Bug report: https://github.com/wingo/fibers/issues/61)
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+ ('dead #t)))
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(define (epoll-default-folder fd events seed)
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(acons fd events seed))
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From c01d3853eb56ea4adacc31f51f6e917f8c0abe1c Mon Sep 17 00:00:00 2001
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From: Maxime Devos <maximedevos@telenet.be>
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Date: Thu, 30 Jun 2022 14:18:36 +0000
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Subject: [PATCH 2/2] Test for issue #61.
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* tests/conditions.scm: Add a test.
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---
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tests/conditions.scm | 20 ++++++++++++++++++++
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1 file changed, 20 insertions(+)
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diff --git a/tests/conditions.scm b/tests/conditions.scm
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index 505c42a..179605a 100644
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--- a/tests/conditions.scm
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+++ b/tests/conditions.scm
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@@ -1,6 +1,7 @@
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;; Fibers: cooperative, event-driven user-space threads.
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;;;; Copyright (C) 2016 Free Software Foundation, Inc.
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+;;;; Copyright (C) 2022 Maxime Devos <maximedevos@telenet.be>
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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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@@ -21,6 +22,7 @@
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#:use-module (fibers)
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#:use-module (fibers conditions)
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#:use-module (fibers operations)
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+ #:use-module (fibers scheduler)
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#:use-module (fibers timers))
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(define failed? #f)
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@@ -78,4 +80,22 @@
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(wait cv)
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#t))
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+;; Make a condition, wait for it inside a fiber, let the fiber abruptly
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+;; terminate and signal the condition afterwards. This tests for the bug
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+;; noticed at <https://github.com/wingo/fibers/issues/61>.
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+(assert-equal #t
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+ (let ((cv (make-condition)))
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+ (run-fibers
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+ (lambda ()
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+ (spawn-fiber (lambda () (wait cv)))
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+ (yield-current-task)) ; let the other fiber wait forever
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+ ;; This test relies on not draining -- this is the default,
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+ ;; but let's make this explicit.
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+ #:drain? #false ;
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+ ;; For simplicity, disable concurrency and preemption.
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+ ;; That way, we can use 'yield-current-task' instead of an
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+ ;; arbitrary sleep time.
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+ #:hz 0 #:parallelism 1)
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+ (signal-condition! cv)))
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+
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(exit (if failed? 1 0))
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