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From: "Ludovic Courtès" <ludo@gnu.org>
To: Zhu Zihao <all_but_last@163.com>
Cc: guile-devel@gnu.org
Subject: Re: Send scheme procedure as callback to foreign thread.
Date: Wed, 12 Oct 2022 22:54:18 +0200	[thread overview]
Message-ID: <87r0zcu5j9.fsf@gnu.org> (raw)
In-Reply-To: <86zge2lv5w.fsf@163.com> (Zhu Zihao's message of "Tue, 11 Oct 2022 14:37:01 +0800")

Hi,

Zhu Zihao <all_but_last@163.com> skribis:

> In Guile FFI programming, we have procedure->pointer, which makes a
> Scheme procedure a foreign callback. And foreign library call use this
> callback.
>
> However, if this callback is called in a another foreign thread. The scheme
> context is not properly setup, It may cause crash or UB.
>
> IIUC, the procedure invoker "invoke_closure" defined in foreign.c
> doesn't use scm_with_guile. If we use scm_with_guile to make a foreign
> callback, would it be OK to execute Scheme procedure in multithreading context?

Yes, it should be.

Could you come up with a minimal reproducer and maybe even a fix, now
that you likely found the solution?  :-)

Thanks in advance,
Ludo’.

PS: It may be best to use bug-guile to reduce the chances that the issue
    gets lost.



  reply	other threads:[~2022-10-12 20:54 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-10-11  6:37 Send scheme procedure as callback to foreign thread Zhu Zihao
2022-10-12 20:54 ` Ludovic Courtès [this message]
2022-10-13 16:28   ` Zhu Zihao

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