From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!not-for-mail From: =?utf-8?Q?=C3=93scar_Fuentes?= Newsgroups: gmane.emacs.devel Subject: Re: good examples of Emacs modules? Date: Fri, 01 Apr 2016 15:25:42 +0200 Message-ID: <87h9fl5ull.fsf@wanadoo.es> References: <56FC5E99.7090804@cs.ucla.edu> <8737r67jbo.fsf@wanadoo.es> <83a8levbaf.fsf@gnu.org> <87y48y60fi.fsf@wanadoo.es> <834mbmv95h.fsf@gnu.org> <87twjm5rc3.fsf@wanadoo.es> <83twjlu9ta.fsf@gnu.org> NNTP-Posting-Host: plane.gmane.org Mime-Version: 1.0 Content-Type: text/plain X-Trace: ger.gmane.org 1459517462 27061 80.91.229.3 (1 Apr 2016 13:31:02 GMT) X-Complaints-To: usenet@ger.gmane.org NNTP-Posting-Date: Fri, 1 Apr 2016 13:31:02 +0000 (UTC) To: emacs-devel@gnu.org Original-X-From: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Fri Apr 01 15:30:54 2016 Return-path: Envelope-to: ged-emacs-devel@m.gmane.org Original-Received: from lists.gnu.org ([208.118.235.17]) by plane.gmane.org with esmtp (Exim 4.69) (envelope-from ) id 1alzA5-0003QT-KD for ged-emacs-devel@m.gmane.org; Fri, 01 Apr 2016 15:30:53 +0200 Original-Received: from localhost ([::1]:44413 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1alzA4-0004ai-Us for ged-emacs-devel@m.gmane.org; Fri, 01 Apr 2016 09:30:52 -0400 Original-Received: from eggs.gnu.org ([2001:4830:134:3::10]:60093) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1alz9S-0004Cx-LF for emacs-devel@gnu.org; Fri, 01 Apr 2016 09:30:15 -0400 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1alz9P-0004Sb-GO for emacs-devel@gnu.org; Fri, 01 Apr 2016 09:30:14 -0400 Original-Received: from plane.gmane.org ([80.91.229.3]:51326) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1alz9P-0004S0-Av for emacs-devel@gnu.org; Fri, 01 Apr 2016 09:30:11 -0400 Original-Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1alz9H-000350-6r for emacs-devel@gnu.org; Fri, 01 Apr 2016 15:30:03 +0200 Original-Received: from 151.red-79-153-146.dynamicip.rima-tde.net ([79.153.146.151]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 01 Apr 2016 15:30:03 +0200 Original-Received: from ofv by 151.red-79-153-146.dynamicip.rima-tde.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Fri, 01 Apr 2016 15:30:03 +0200 X-Injected-Via-Gmane: http://gmane.org/ Original-Lines: 19 Original-X-Complaints-To: usenet@ger.gmane.org X-Gmane-NNTP-Posting-Host: 151.red-79-153-146.dynamicip.rima-tde.net User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/25.0.92 (gnu/linux) Cancel-Lock: sha1:aMRYynmEdnEA+UjtkMg2eU/AaMc= X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 80.91.229.3 X-BeenThere: emacs-devel@gnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "Emacs development discussions." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Original-Sender: emacs-devel-bounces+ged-emacs-devel=m.gmane.org@gnu.org Xref: news.gmane.org gmane.emacs.devel:202566 Archived-At: Eli Zaretskii writes: > I think you want to wrap some kind of "handle" that is meaningful to > libgit2 into a user-ptr object (see the existing docs about modules > for details about these). A user-ptr object has a finalizer, a > function that is called by GC when the object goes out of scope. This means that GCing the object is unpredictable, right? Also, if the API uses a struct as the session object, you need to store it somewhere and expose a pointer to it to the Elisp code; that is, you can't put arbitrary data on the Elisp memory space. > The > finalizer function should do whatever libgit2 needs to close the > session and free whatever resources the session used. > > You have a demo if using a user-ptr in modules/mod-test/. Thanks.