* bug#48566: call-with-blocked-asyncs does not like escape continuations
@ 2021-05-21 14:28 Maxime Devos
0 siblings, 0 replies; only message in thread
From: Maxime Devos @ 2021-05-21 14:28 UTC (permalink / raw)
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Version: 3.0.5 (as found on Guix System, on a x86-64 system)
Here is a minimal reproducer.
(use-modules (ice-9 control))
(call-with-unblocked-asyncs (lambda () 'hi)))
(lambda () (system-async-mark ec) (safe-point))))
ice-9/boot-9.scm:1669:16: In procedure raise-exception:
In procedure call-with-unblocked-asyncs: asyncs already unblocked
Entering a new prompt. Type `,bt' for a backtrace or `,q' to continue.
scheme@(guile-user) > ,bt
2 (call-with-blocked-asyncs #<procedure safe-point ()>)
1 (call-with-unblocked-asyncs #<procedure 7f83245ad2a0 at /home/sylvii…>)
1669:16 0 (raise-exception _ #:continuable? _)
This bug was found while trying to test whether the definition of with-mutex
is correct in the present of asynchronicities (system-async-mark). (with-mutex
does not use call-with-blocked-asyncs & call-with-unblocked-asyncs, while I
think it should --- what if the Scheme code was interrupted in the 'in-guard'
or 'out-guard' of a dynamic-wind?).
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2021-05-21 14:28 bug#48566: call-with-blocked-asyncs does not like escape continuations Maxime Devos
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