From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: ludo@gnu.org (Ludovic =?iso-8859-1?Q?Court=E8s?=) Newsgroups: gmane.lisp.guile.user Subject: Re: atexit in modules Date: Thu, 13 Nov 2008 20:26:30 +0100 Message-ID: <87wsf7whp5.fsf@gnu.org> References: <677173.17745.qm@web37908.mail.mud.yahoo.com> NNTP-Posting-Host: lo.gmane.org Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Trace: ger.gmane.org 1226604603 14096 80.91.229.12 (13 Nov 2008 19:30:03 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Thu, 13 Nov 2008 19:30:03 +0000 (UTC) To: guile-user@gnu.org Original-X-From: guile-user-bounces+guile-user=m.gmane.org@gnu.org Thu Nov 13 20:30:31 2008 Return-path: Envelope-to: guile-user@m.gmane.org Original-Received: from lists.gnu.org ([199.232.76.165]) by lo.gmane.org with esmtp (Exim 4.50) id 1L0htZ-0003cI-Du for guile-user@m.gmane.org; Thu, 13 Nov 2008 20:30:25 +0100 Original-Received: from localhost ([127.0.0.1]:54758 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1L0hsR-0007Ig-6M for guile-user@m.gmane.org; Thu, 13 Nov 2008 14:29:15 -0500 Original-Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1L0hq2-00069Y-En for guile-user@gnu.org; Thu, 13 Nov 2008 14:26:46 -0500 Original-Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1L0hq0-000692-Ne for guile-user@gnu.org; Thu, 13 Nov 2008 14:26:44 -0500 Original-Received: from [199.232.76.173] (port=49389 helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1L0hq0-00068r-Io for guile-user@gnu.org; Thu, 13 Nov 2008 14:26:44 -0500 Original-Received: from main.gmane.org ([80.91.229.2]:49053 helo=ciao.gmane.org) by monty-python.gnu.org with esmtps (TLS-1.0:RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1L0hq0-0005gc-Cg for guile-user@gnu.org; Thu, 13 Nov 2008 14:26:44 -0500 Original-Received: from list by ciao.gmane.org with local (Exim 4.43) id 1L0hpt-0003cx-Ls for guile-user@gnu.org; Thu, 13 Nov 2008 19:26:37 +0000 Original-Received: from reverse-83.fdn.fr ([80.67.176.83]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 13 Nov 2008 19:26:37 +0000 Original-Received: from ludo by reverse-83.fdn.fr with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Thu, 13 Nov 2008 19:26:37 +0000 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 37 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: reverse-83.fdn.fr X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 23 Brumaire an 217 de la =?iso-8859-1?Q?R=E9volution?= X-PGP-Key-ID: 0xEA52ECF4 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 821D 815D 902A 7EAB 5CEE D120 7FBA 3D4F EB1F 5364 X-OS: i686-pc-linux-gnu User-Agent: Gnus/5.11 (Gnus v5.11) Emacs/22.3 (gnu/linux) Cancel-Lock: sha1:EDiEbFMBmGsuYYlGwfvJOicV7hQ= X-detected-operating-system: by monty-python.gnu.org: GNU/Linux 2.6, seldom 2.4 (older, 4) X-BeenThere: guile-user@gnu.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General Guile related discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Original-Sender: guile-user-bounces+guile-user=m.gmane.org@gnu.org Errors-To: guile-user-bounces+guile-user=m.gmane.org@gnu.org Xref: news.gmane.org gmane.lisp.guile.user:6900 Archived-At: Hello, Mike Gran writes: > I have a C library that I wrapped as gsubrs that get put into a Guile > module. The C library wants a library_init() function called when it > is initialized and a library_end() function called when it taken down. > > (for the curious, it is specifically mysql_library_init() and > mysql_library_end().) > > The library_init() call is easy because it can be called automatically > in the initialization function called by (load-extension "libfoo.so" > "foo_init"). In theory, the Right Way(tm) would be to register a finalizer for the module that does `load-extension'. That can be done using a guardian, but the guardian the needs to be called once in a while, e.g., in `after-gc-hook' and `exit-hook'. > Since libraries are never unloaded, I guess I can wait until the > program exit to call library_end(). Well, yes. :-) Then `exit-hook' should do the job, no? > I've got one crazy idea. I could create a new special SMOB type which > calls library_end() as part of the SMOB's free function. When the > Guile library is loaded, it will define a single variable of that type > in the module's environment. The guardian suggestion above achieves that, but slightly more elegantly. :-) Thanks, Ludo'.