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Re: Trouble joining with threads from C

From: Ludovic Courtès
Subject: Re: Trouble joining with threads from C
Date: Fri, 15 Apr 2011 23:44:52 +0200
User-agent: Gnus/5.110015 (No Gnus v0.15) Emacs/23.3 (gnu/linux)

Hi Andy!

Thanks for your explanations.

Andy Wingo <address@hidden> writes:

> On Wed 13 Apr 2011 23:34, address@hidden (Ludovic Courtès) writes:
>> After reviewing f60a7648d5926555c7760364a6fbb7dc0cf60720 (which
>> addressed the same issue), I lean towards reverting it and instead
>> applying the patch I just sent.
>> The problem I see with f60a7648d5926555c7760364a6fbb7dc0cf60720 is that
>> it re-introduces a pthread_key, even when using TLS, and make things a
>> bit complex IMO.
> The issue is that threads in Guile are not always spawned by Guile.
> It's true that of the two cases in which Guile spawned a thread, one of
> them wasn't getting the cleanup handlers called, and your patch fixes
> that; but that ignores the case of threads that are spawned by a user's
> program.

Right, I was just focusing on Mark’s case, blissfully ignoring #32436.

> For example in the following program:
>     void* thread (void*)
>     {
>       scm_with_guile (do_something, NULL);
>       scm_with_guile (do_something_else, NULL);
>       return NULL;
>     }
>     int main ()
>     {
>       pthread_t thr;
>       pthread_create (&thr, NULL, thread, NULL);
>       pthread_join (thr, NULL);
>       return 0;
>     }
> When do you propose that the cleanup handlers for the thread be called?

I’ll followup on this later, but currently it seems impossible to call
GC_INIT from a thread other than the initial thread [0].



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