From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED!not-for-mail From: Andy Wingo Newsgroups: gmane.lisp.guile.bugs Subject: bug#24695: impossible to use weak hash tables inside gc hooks Date: Wed, 01 Mar 2017 13:49:53 +0100 Message-ID: <87wpc9go0e.fsf@pobox.com> References: NNTP-Posting-Host: blaine.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: blaine.gmane.org 1488372680 4916 195.159.176.226 (1 Mar 2017 12:51:20 GMT) X-Complaints-To: usenet@blaine.gmane.org NNTP-Posting-Date: Wed, 1 Mar 2017 12:51:20 +0000 (UTC) User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux) Cc: 24695@debbugs.gnu.org To: Stefan Israelsson Tampe Original-X-From: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Wed Mar 01 13:51:13 2017 Return-path: Envelope-to: guile-bugs@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by blaine.gmane.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cj3io-0000Np-1r for guile-bugs@m.gmane.org; Wed, 01 Mar 2017 13:51:10 +0100 Original-Received: from localhost ([::1]:46094 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1cj3iu-00045c-03 for guile-bugs@m.gmane.org; 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Wed, 01 Mar 2017 12:51:02 +0000 Original-Received: (at 24695) by debbugs.gnu.org; 1 Mar 2017 12:50:05 +0000 Original-Received: from localhost ([127.0.0.1]:32942 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cj3hl-0006Y3-JF for submit@debbugs.gnu.org; Wed, 01 Mar 2017 07:50:05 -0500 Original-Received: from pb-sasl1.pobox.com ([64.147.108.66]:64122 helo=sasl.smtp.pobox.com) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from ) id 1cj3hk-0006Xv-8e for 24695@debbugs.gnu.org; Wed, 01 Mar 2017 07:50:04 -0500 Original-Received: from sasl.smtp.pobox.com (unknown [127.0.0.1]) by pb-sasl1.pobox.com (Postfix) with ESMTP id C06D75E718; Wed, 1 Mar 2017 07:50:02 -0500 (EST) DKIM-Signature: v=1; a=rsa-sha1; c=relaxed; d=pobox.com; h=from:to:cc :subject:references:date:in-reply-to:message-id:mime-version :content-type; s=sasl; bh=J40oQJD60zc3KxSuwIS7ICmaY8g=; b=oEaHEy X9y9qKL4Mnjj73Z0OtoimknGdd5ONyLagXdVtEiZXuu7rd+oE41p2Jrr0anu1Kf5 xylRoaT1Zob5WFAPD6+HLRjUbg/tSrSGil0b+8m+2mVWNH0DrnQA1fMk+eo/RuYg LIZRBCGPxOC+/S+zf4YntUd09xTQS68KdTGSM= DomainKey-Signature: a=rsa-sha1; c=nofws; d=pobox.com; h=from:to:cc :subject:references:date:in-reply-to:message-id:mime-version :content-type; q=dns; s=sasl; b=jYWjrFCsgh9eDTdxA3BtJAs8bNHsLPa9 2/TApbDF2/OpM2uphbL8iM6DBjODEEluAV2yGtN65asANC9+TfZ1qI7anZnZ8sLN q+47xFQ32DcUJQlXtpJtnW2YuGEVdIJnD809E0EwZyqeQfIrBxl/1CeeM3p4UpoO aqOQb0mQjMw= Original-Received: from pb-sasl1.nyi.icgroup.com (unknown [127.0.0.1]) by pb-sasl1.pobox.com (Postfix) with ESMTP id 76B1A5E715; Wed, 1 Mar 2017 07:50:02 -0500 (EST) Original-Received: from clucks (unknown [109.190.228.233]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by pb-sasl1.pobox.com (Postfix) with ESMTPSA id 36CE45E714; Wed, 1 Mar 2017 07:50:00 -0500 (EST) In-Reply-To: (Stefan Israelsson Tampe's message of "Fri, 14 Oct 2016 20:54:56 +0200") X-Pobox-Relay-ID: 9581AA8E-FE7D-11E6-BBA9-B667064AB293-02397024!pb-sasl1.pobox.com X-BeenThere: debbugs-submit@debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 208.118.235.43 X-BeenThere: bug-guile@gnu.org List-Id: "Bug reports for GUILE, GNU's Ubiquitous Extension Language" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: bug-guile-bounces+guile-bugs=m.gmane.org@gnu.org Original-Sender: "bug-guile" Xref: news.gmane.org gmane.lisp.guile.bugs:8615 Archived-At: On Fri 14 Oct 2016 20:54, Stefan Israelsson Tampe 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