GNU logs - #24695, boring messages

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Subject: bug#24695: impossible to use weak hash tables inside gc hooks
Resent-From: Stefan Israelsson Tampe <stefan.itampe@HIDDEN>
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From: Stefan Israelsson Tampe <stefan.itampe@HIDDEN>
Date: Fri, 14 Oct 2016 20:54:56 +0200
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For more advanced gc concepts it would be nice to keep a set a objects in a
weak key hash table and at gc loop over the alive ones the various gc hooks
that is available for the c coder.

The problem is that current guile data structure would hang on folding
because inside the guile weak folder gc is assumed to be prevented. Not
sure what to do here. This might be a feature request or a bug report
dependning on how you view it.

Regards

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<div dir=3D"ltr">For more advanced gc concepts it would be nice to keep a s=
et a objects in a weak key hash table and at gc loop over the alive ones th=
e various gc hooks that is available for the c coder.<div><br></div><div>Th=
e problem is that current guile data structure would hang on folding becaus=
e inside the guile weak folder gc is assumed to be prevented. Not sure what=
 to do here. This might be a feature request or a bug report dependning on =
how you view it.</div><div><br></div><div>Regards</div></div>

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Stefan Israelsson Tampe <stefan.itampe@HIDDEN>
Subject: bug#24695: Acknowledgement (impossible to use weak hash tables
 inside gc hooks)
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Subject: bug#24695: impossible to use weak hash tables inside gc hooks
Resent-From: Andy Wingo <wingo@HIDDEN>
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From: Andy Wingo <wingo@HIDDEN>
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Date: Wed, 01 Mar 2017 13:49:53 +0100
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 (Stefan Israelsson Tampe's message of "Fri, 14 Oct 2016 20:54:56
 +0200")
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On Fri 14 Oct 2016 20:54, Stefan Israelsson Tampe <stefan.itampe@HIDDEN> writes:

> For more advanced gc concepts it would be nice to keep a set a objects
> in a weak key hash table and at gc loop over the alive ones the
> various gc hooks that is available for the c
> coder.
>
> The problem is that current guile data structure would hang on folding
> because inside the guile weak folder gc is assumed to be
> prevented. Not sure what to do here. This might be a
> feature request or a bug report dependning on how you view it.

What does "at GC" mean?  After GC?  Before GC is a pretty tense
situation as you can't allocate memory.  Also I suspect you could do
this with a weak vector (or other structure with disappearing links) and
a before_gc C hook.  WDYT?

I am tempted to just close this one as out of scope for Guile :)

Andy

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