diff options
Diffstat (limited to 'gnu/packages/patches/guile-fibers-epoll-instance-is-dead.patch')
| -rw-r--r-- | gnu/packages/patches/guile-fibers-epoll-instance-is-dead.patch | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/gnu/packages/patches/guile-fibers-epoll-instance-is-dead.patch b/gnu/packages/patches/guile-fibers-epoll-instance-is-dead.patch new file mode 100644 index 0000000000..ba191f765d --- /dev/null +++ b/gnu/packages/patches/guile-fibers-epoll-instance-is-dead.patch @@ -0,0 +1,99 @@ +From 5db4077e9f5166033637d2af9532ec6144b85646 Mon Sep 17 00:00:00 2001 +From: Maxime Devos <maximedevos@telenet.be> +Date: Thu, 30 Jun 2022 14:21:47 +0000 +Subject: [PATCH 1/2] Fix behaviour of 'epoll-wake!' after 'run-fibers'. + +This avoids the "epoll instance is dead" error noticed in +GNUnet-Scheme's test suite, as reported at +<https://github.com/wingo/fibers/issues/61>. +A test is added in the next commit. + +This patch has been applied upstream, but there hasn't been +a new release yet at time of writing. + +* fibers/epoll.scm (epoll-wake!)[dead]: Instead of throwing an error, +just return #t. +--- + fibers/epoll.scm | 8 +++++++- + 1 file changed, 7 insertions(+), 1 deletion(-) + +diff --git a/fibers/epoll.scm b/fibers/epoll.scm +index d26db4d..eb63242 100644 +--- a/fibers/epoll.scm ++++ b/fibers/epoll.scm +@@ -1,6 +1,7 @@ + ;; epoll + + ;;;; Copyright (C) 2016 Andy Wingo <wingo@pobox.com> ++;;;; Copyright (C) 2022 Maxime Devos <maximedevos@telenet.be> + ;;;; + ;;;; This library is free software; you can redistribute it and/or + ;;;; modify it under the terms of the GNU Lesser General Public +@@ -135,7 +136,12 @@ epoll wait (if appropriate)." + ('waiting + (primitive-epoll-wake (fileno (epoll-wake-write-pipe epoll)))) + ('not-waiting #t) +- ('dead (error "epoll instance is dead")))) ++ ;; This can happen if a fiber was waiting on a condition and ++ ;; run-fibers completes before the fiber completes and afterwards ++ ;; the condition is signalled. In that case, we don't have to ++ ;; resurrect the fiber or something, we can just do nothing. ++ ;; (Bug report: https://github.com/wingo/fibers/issues/61) ++ ('dead #t))) + + (define (epoll-default-folder fd events seed) + (acons fd events seed)) + +From c01d3853eb56ea4adacc31f51f6e917f8c0abe1c Mon Sep 17 00:00:00 2001 +From: Maxime Devos <maximedevos@telenet.be> +Date: Thu, 30 Jun 2022 14:18:36 +0000 +Subject: [PATCH 2/2] Test for issue #61. + +* tests/conditions.scm: Add a test. +--- + tests/conditions.scm | 20 ++++++++++++++++++++ + 1 file changed, 20 insertions(+) + +diff --git a/tests/conditions.scm b/tests/conditions.scm +index 505c42a..179605a 100644 +--- a/tests/conditions.scm ++++ b/tests/conditions.scm +@@ -1,6 +1,7 @@ + ;; Fibers: cooperative, event-driven user-space threads. + + ;;;; Copyright (C) 2016 Free Software Foundation, Inc. ++;;;; Copyright (C) 2022 Maxime Devos <maximedevos@telenet.be> + ;;;; + ;;;; This library is free software; you can redistribute it and/or + ;;;; modify it under the terms of the GNU Lesser General Public +@@ -21,6 +22,7 @@ + #:use-module (fibers) + #:use-module (fibers conditions) + #:use-module (fibers operations) ++ #:use-module (fibers scheduler) + #:use-module (fibers timers)) + + (define failed? #f) +@@ -78,4 +80,22 @@ + (wait cv) + #t)) + ++;; Make a condition, wait for it inside a fiber, let the fiber abruptly ++;; terminate and signal the condition afterwards. This tests for the bug ++;; noticed at <https://github.com/wingo/fibers/issues/61>. ++(assert-equal #t ++ (let ((cv (make-condition))) ++ (run-fibers ++ (lambda () ++ (spawn-fiber (lambda () (wait cv))) ++ (yield-current-task)) ; let the other fiber wait forever ++ ;; This test relies on not draining -- this is the default, ++ ;; but let's make this explicit. ++ #:drain? #false ; ++ ;; For simplicity, disable concurrency and preemption. ++ ;; That way, we can use 'yield-current-task' instead of an ++ ;; arbitrary sleep time. ++ #:hz 0 #:parallelism 1) ++ (signal-condition! cv))) ++ + (exit (if failed? 1 0)) |