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[bug#32121] [PATCH 2/5] utils: Reset the Fiber dynamic environment in %N
From: |
Ludovic Courtès |
Subject: |
[bug#32121] [PATCH 2/5] utils: Reset the Fiber dynamic environment in %NON-BLOCKING. |
Date: |
Sat, 14 Jul 2018 15:45:58 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) |
Clément Lassieur <address@hidden> skribis:
> Ludovic Courtès <address@hidden> writes:
>
>> Clément Lassieur <address@hidden> skribis:
>>
>>> * src/cuirass/utils.scm (%non-blocking): Wrap body in PARAMETERIZE form that
>>> clears CURRENT-FIBER.
>>>
>>> So that PUT-MESSAGE doesn't try to suspend itself within
>>> CALL-WITH-NEW-THREAD.
>>> See https://lists.gnu.org/archive/html/guile-devel/2018-07/msg00009.html.
>>
>> Good catch!
>>
>>> + (parameterize (((@@ (fibers internal) current-fiber) #f))
>>> + (let ((channel (make-channel)))
>>
>> Instead of using @@, I think you can add an explicit:
>>
>> #:use-module ((fibers internal) #:select (current-fiber))
>
> That doesn't work because it would select the exported variable (as '@'
> would have done), that is: the value of the parameter. What I need is
> the parameter itself, which is hidden.
>
> See (fibers internal):
>
> #:export ;; Low-level interface: schedulers and threads.
>
> [...]
>
> (current-fiber/public . current-fiber)
> [...]
>
> (define current-fiber (make-parameter #f))
> (define (current-fiber/public)
> "Return the current fiber, or @code{#f} if no fiber is current."
> (current-fiber))
Oh I see. Thanks for explaining!
Ludo’.
[bug#32121] [PATCH 4/5] database: Call a specification 'jobset' instead of 'project'., Clément Lassieur, 2018/07/10