From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Original-To: caml-list@sympa.inria.fr Delivered-To: caml-list@sympa.inria.fr Received: from mail3-relais-sop.national.inria.fr (mail3-relais-sop.national.inria.fr [192.134.164.104]) by sympa.inria.fr (Postfix) with ESMTPS id B28747FE07 for ; Wed, 3 Feb 2016 19:02:08 +0100 (CET) IronPort-PHdr: 9a23:TwIPWxMGzSZLj1H9HDol6mtUPXoX/o7sNwtQ0KIMzox0KPv5rarrMEGX3/hxlliBBdydsKIbzbOI+PC7EUU7or+/81k6OKRWUBEEjchE1ycBO+WiTXPBEfjxciYhF95DXlI2t1uyMExSBdqsLwaK+i760zceF13FOBZvIaytQ8iJ35vxjr75q8abSj4LrQT+SIs6FA+xowTVu5teqqpZAYF19CH0pGBVcf9d32JiKAHbtR/94sCt4MwrqHwI6LoJvvRNWqTifqk+UacQTHF/azh0t4XXskzvRBWO6jMnUmgbjgEAVxPF4RzmRb/4tjb/8O98xG+XMdCgHp4uXjH3zapxRRr5wBYOMzo+6CmDm8V0iKVDiB2krh17hYXTZdfGZ7JFYqrBcIZCFiJ6VcFLWnkEW9vkYg== Authentication-Results: mail3-smtp-sop.national.inria.fr; spf=None smtp.pra=yallop@gmail.com; spf=Pass smtp.mailfrom=yallop@gmail.com; spf=None smtp.helo=postmaster@mail-qk0-f179.google.com Received-SPF: None (mail3-smtp-sop.national.inria.fr: no sender authenticity information available from domain of yallop@gmail.com) identity=pra; client-ip=209.85.220.179; receiver=mail3-smtp-sop.national.inria.fr; envelope-from="yallop@gmail.com"; x-sender="yallop@gmail.com"; x-conformance=sidf_compatible Received-SPF: Pass (mail3-smtp-sop.national.inria.fr: domain of yallop@gmail.com designates 209.85.220.179 as permitted sender) identity=mailfrom; client-ip=209.85.220.179; receiver=mail3-smtp-sop.national.inria.fr; envelope-from="yallop@gmail.com"; x-sender="yallop@gmail.com"; x-conformance=sidf_compatible; x-record-type="v=spf1" Received-SPF: None (mail3-smtp-sop.national.inria.fr: no sender authenticity information available from domain of postmaster@mail-qk0-f179.google.com) identity=helo; client-ip=209.85.220.179; receiver=mail3-smtp-sop.national.inria.fr; envelope-from="yallop@gmail.com"; x-sender="postmaster@mail-qk0-f179.google.com"; x-conformance=sidf_compatible X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: A0DmAAAcQLJWlLPcVdFeDoRrBohVnzaRXgENgWaGDQKBQQc4FAEBAQEBAQEBEAEBAQEHCwsJHzBBEAGBW4IVAQEEEhEdARsdAQMMBgULDQICJgICIQEBEQEFARwGEyKHYwEDEqNAgTE+MYs0gWmCV4VAChknDVGDbgEBAQEGAQEBAQEVAQUKBG2JToI3hHuBOgWOGYhYi1qBc45xhn+GBREegQ0eAQGCOB6BFVwbLoMNhl4BAQE X-IPAS-Result: A0DmAAAcQLJWlLPcVdFeDoRrBohVnzaRXgENgWaGDQKBQQc4FAEBAQEBAQEBEAEBAQEHCwsJHzBBEAGBW4IVAQEEEhEdARsdAQMMBgULDQICJgICIQEBEQEFARwGEyKHYwEDEqNAgTE+MYs0gWmCV4VAChknDVGDbgEBAQEGAQEBAQEVAQUKBG2JToI3hHuBOgWOGYhYi1qBc45xhn+GBREegQ0eAQGCOB6BFVwbLoMNhl4BAQE X-IronPort-AV: E=Sophos;i="5.22,391,1449529200"; d="scan'208";a="162980396" Received: from mail-qk0-f179.google.com ([209.85.220.179]) by mail3-smtp-sop.national.inria.fr with ESMTP/TLS/AES128-GCM-SHA256; 03 Feb 2016 19:02:07 +0100 Received: by mail-qk0-f179.google.com with SMTP id o6so11038041qkc.2 for ; Wed, 03 Feb 2016 10:02:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; bh=tWj9mEVvTYHhkB0cZ67WAuHCzR1bOa/B4DE8pNVlP0E=; b=zph3SFCz0dAvyPqSka2e8Fb37lh0+n//UjeRuyIX6arXGbapNAk2IsS4izbKYW/V75 nZDNDSnSnsUwkIdC+BPGRCQdJ//xYn7+CE3RkWCALYb1SUt6/lvPHqChSI+ASt207HXD IODkdsSZ6fKWZskYWAbNqjiywbCfNQxfaLEgxpwJTh8hhQ01V3z+wm/kN6LuIh6YsVT5 NEWJMiJpzA5ZLB/QbB6h+Zm2DuX8mJRsV6c7KFGdWGWIIECtxqmqNLYPnJWotw+U8MFV ChdVM11RGvf82+vgqla7cyA2SqanQ5p7l66ab+kT/pnfWI38YNgHaeyuO/jbeNuT90ns Vnug== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:date :message-id:subject:from:to:cc:content-type; bh=tWj9mEVvTYHhkB0cZ67WAuHCzR1bOa/B4DE8pNVlP0E=; b=EymYXDbSqU9UYG/Zqs0jLnc+vQtG77PxGinCAT2WgY6jBmIcxaYHOjcgdNLmKrHcQ2 GI6ahTPRceGFM10kXPdqgIhVpVXBRPRRD9TLRXRYFwkBxhugqd2Gv23zLXyf0QJEvq5d jMA42Uz/w9lZDHm8oDYb3WkaPYDY6Nyruv/H2qSjseduqglht44sDA5g2gAjakiqlQQI 42xQNyy9NWE5HiAlZPg2uqcncy3dha0w7n0FRNZtmu4abi4aJt03BL8ZxquvL/ODvaoz uhl3w3bT319MsTlkEo2RkDHcBGoQE8Bu5fn5tOWKDFsvTWiKCQ6PGLmuIegm42u+JMcL YS3A== X-Gm-Message-State: AG10YOQ9pqPU/TeFSrRdBWSi9tiEQ8VwwDMpy/8HV85TRVQeyVEAmb9E7GrqyZP/lPKVPuBLlHjT4I7GLQd/eA== MIME-Version: 1.0 X-Received: by 10.55.72.12 with SMTP id v12mr3291022qka.28.1454522526525; Wed, 03 Feb 2016 10:02:06 -0800 (PST) Received: by 10.55.192.129 with HTTP; Wed, 3 Feb 2016 10:02:06 -0800 (PST) In-Reply-To: References: <56B1DC54.1060109@tu-berlin.de> <86r3guq8t4.fsf@gmail.com> Date: Wed, 3 Feb 2016 10:02:06 -0800 Message-ID: From: Jeremy Yallop To: David Sheets Cc: Malcolm Matalka , Jeremie Dimino , =?UTF-8?Q?Christoph_H=C3=B6ger?= , caml users Content-Type: text/plain; charset=UTF-8 Subject: Re: [Caml-list] Save callbacks from OCaml to C On 3 February 2016 at 05:44, David Sheets wrote: > On Wed, Feb 3, 2016 at 12:26 PM, Malcolm Matalka wrote: >> Jeremie Dimino writes: >>> You need to register [ml_t], [ml_x] and [ml_g >>> ] as GC roots. Otherwise if the GC runs in caml_ba_alloc for instance, >>> [ml_t] might ends up containing garbage even before reaching >>> [caml_callback3]. You can use the normal macros for that: >>> >> If one is using ctypes, is all of this taken care of? I have a library >> that registers a bunch of Ocaml functions in C code, which the C code >> calls. I haven't experienced anything bad happening yet, but that >> doesn't mean much... > > If you use ctypes and pass OCaml closures to C, you *must* retain a > reference to the closure to avoid it being GCed. If you do not, you > may experience the exception CallToExpiredClosure sporadically. Besides David's caveat, the answer is yes: ctypes will take care of registering arguments as GC roots as necessary.