[{"id":35612,"web_url":"https://patchwork.libcamera.org/comment/35612/","msgid":"<0354c618-becf-4c5b-8592-441ebeb03d91@gmx.de>","date":"2025-08-28T18:16:42","subject":"Re: [PATCH v6 0/6] libcamera: process: Remove `ProcessManager`\n\tsingleton","submitter":{"id":111,"url":"https://patchwork.libcamera.org/api/people/111/","name":"Christian Rauch","email":"Rauch.Christian@gmx.de"},"content":"Hi Barnabás,\n\nWith the \"ProcessManager\" removed, there is still the \"self_\"-check in \n\"CameraManager\" that throws the fatal error \"Multiple CameraManager \nobjects are not allowed\" when multiple \"CameraManager\" are instantiated \nin the same address space.\n\nIs this still necessary? I did a quick check, remove the \"static \nCameraManager *self_;\" completely, and I am able to instantiate the \nCameraManager multiple times and read from two different cameras.\n\nIs the \"static CameraManager *self_;\" and the check still required?\n\nBest,\nChristian\n\n\nAm 28.07.25 um 13:36 schrieb Barnabás Pőcze:\n> The main goal is to remove the need for the ProcessManager singleton. That\n> is achieved by using pidfd + clone3(), which raises the minimum\n> kernel version to 5.4. There are also additional misc. changes.\n> ---\n> changes in v6:\n> * first couple patches merged\n> * rebase\n> \n> changes in v5:\n> * send the actually intended version...\n> \n> changes in v4:\n> * address review comments\n> \n> v5: https://patchwork.libcamera.org/cover/23252/\n> v4: https://patchwork.libcamera.org/cover/23242/\n> v3: https://patchwork.libcamera.org/cover/23013/\n> v2: https://patchwork.libcamera.org/patch/22609/\n> v1: https://patchwork.libcamera.org/patch/22522/\n> \n> \n> Barnabás Pőcze (6):\n> libcamera: process: Use `pid_` member to decide if running\n> libcamera: process: start(): Use span instead of vector\n> libcamera: process: closeAllFdsExcept(): Take vector by value\n> libcamera: process: Move `closeAllFdsExcept()`\n> libcamera: process: Use `close_range()` when available\n> libcamera: process: Remove `ProcessManager` singleton\n> \n> include/libcamera/internal/camera_manager.h | 1 -\n> include/libcamera/internal/process.h | 42 +--\n> meson.build | 6 +-\n> src/libcamera/ipc_pipe_unixsocket.cpp | 9 +-\n> src/libcamera/process.cpp | 304 +++++++-------------\n> test/ipc/unixsocket_ipc.cpp | 2 -\n> test/log/log_process.cpp | 2 -\n> test/process/process_test.cpp | 7 +-\n> 8 files changed, 113 insertions(+), 260 deletions(-)\n> \n> --\n> 2.50.1","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 60576BD87C\n\tfor ;\n\tThu, 28 Aug 2025 18:16:45 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 67B82692F3;\n\tThu, 28 Aug 2025 20:16:44 +0200 (CEST)","from mout.gmx.net (mout.gmx.net [212.227.15.18])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 1D09B613B8\n\tfor ;\n\tThu, 28 Aug 2025 20:16:43 +0200 (CEST)","from [10.0.0.2] 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"}},{"id":35613,"web_url":"https://patchwork.libcamera.org/comment/35613/","msgid":"","date":"2025-08-28T18:20:39","subject":"Re: [PATCH v6 0/6] libcamera: process: Remove `ProcessManager`\n\tsingleton","submitter":{"id":216,"url":"https://patchwork.libcamera.org/api/people/216/","name":"Barnabás Pőcze","email":"barnabas.pocze@ideasonboard.com"},"content":"Hi\n\n2025. 08. 28. 20:16 keltezéssel, Christian Rauch írta:\n> Hi Barnabás,\n> \n> With the \"ProcessManager\" removed, there is still the \"self_\"-check in \"CameraManager\" that throws the fatal error \"Multiple CameraManager objects are not allowed\" when multiple \"CameraManager\" are instantiated in the same address space.\n> \n> Is this still necessary? I did a quick check, remove the \"static CameraManager *self_;\" completely, and I am able to instantiate the CameraManager multiple times and read from two different cameras.\n> \n> Is the \"static CameraManager *self_;\" and the check still required?\n\nPlease see https://bugs.libcamera.org/show_bug.cgi?id=246\n\n\nRegards,\nBarnabás Pőcze\n\n\n> \n> Best,\n> Christian\n> \n> \n> Am 28.07.25 um 13:36 schrieb Barnabás Pőcze:\n>> The main goal is to remove the need for the ProcessManager singleton. That\n>> is achieved by using pidfd + clone3(), which raises the minimum\n>> kernel version to 5.4. There are also additional misc. changes.\n>> ---\n>> changes in v6:\n>>    * first couple patches merged\n>>    * rebase\n>>\n>> changes in v5:\n>>    * send the actually intended version...\n>>\n>> changes in v4:\n>>    * address review comments\n>>\n>> v5: https://patchwork.libcamera.org/cover/23252/\n>> v4: https://patchwork.libcamera.org/cover/23242/\n>> v3: https://patchwork.libcamera.org/cover/23013/\n>> v2: https://patchwork.libcamera.org/patch/22609/\n>> v1: https://patchwork.libcamera.org/patch/22522/\n>>\n>>\n>> Barnabás Pőcze (6):\n>>    libcamera: process: Use `pid_` member to decide if running\n>>    libcamera: process: start(): Use span instead of vector\n>>    libcamera: process: closeAllFdsExcept(): Take vector by value\n>>    libcamera: process: Move `closeAllFdsExcept()`\n>>    libcamera: process: Use `close_range()` when available\n>>    libcamera: process: Remove `ProcessManager` singleton\n>>\n>>   include/libcamera/internal/camera_manager.h |   1 -\n>>   include/libcamera/internal/process.h        |  42 +--\n>>   meson.build                                 |   6 +-\n>>   src/libcamera/ipc_pipe_unixsocket.cpp       |   9 +-\n>>   src/libcamera/process.cpp                   | 304 +++++++-------------\n>>   test/ipc/unixsocket_ipc.cpp                 |   2 -\n>>   test/log/log_process.cpp                    |   2 -\n>>   test/process/process_test.cpp               |   7 +-\n>>   8 files changed, 113 insertions(+), 260 deletions(-)\n>>\n>> -- \n>> 2.50.1\n>","headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 854E0BD87C\n\tfor ;\n\tThu, 28 Aug 2025 18:20:46 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 3CB45692F3;\n\tThu, 28 Aug 2025 20:20:45 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 146E1613B8\n\tfor ;\n\tThu, 28 Aug 2025 20:20:43 +0200 (CEST)","from [192.168.33.12] (185.221.143.232.nat.pool.zt.hu\n\t[185.221.143.232])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 528011809;\n\tThu, 28 Aug 2025 20:19:38 +0200 (CEST)"],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key;\n\tunprotected) header.d=ideasonboard.com header.i=@ideasonboard.com\n\theader.b=\"ldqTj1Cn\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1756405178;\n\tbh=MKVOCgP9zZ31f1OkCnYXItml8x7jV4ooLMNV1/xyYcU=;\n\th=Date:Subject:To:References:From:In-Reply-To:From;\n\tb=ldqTj1CneK4kQxlFa7KpZzTno89BEipp6b3u7rc1k7nzHopcbGV2CDci3aexTikBh\n\t4a9iy2uifptQTpFGDhT/336JHdhfpjM83qm5FkNm3DojRMm9IZv1m15+kCrho7u67a\n\tqhiBFiIflNvPRQW65H1oO/K+OLr5BxJ5gi9/rUkg=","Message-ID":"","Date":"Thu, 28 Aug 2025 20:20:39 +0200","MIME-Version":"1.0","User-Agent":"Mozilla Thunderbird","Subject":"Re: [PATCH v6 0/6] libcamera: process: Remove `ProcessManager`\n\tsingleton","To":"Christian Rauch ,\n\tlibcamera-devel@lists.libcamera.org","References":"<20250728113641.238256-1-barnabas.pocze@ideasonboard.com>\n\t<0354c618-becf-4c5b-8592-441ebeb03d91@gmx.de>","From":"=?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= ","Content-Language":"en-US, hu-HU","In-Reply-To":"<0354c618-becf-4c5b-8592-441ebeb03d91@gmx.de>","Content-Type":"text/plain; charset=UTF-8; format=flowed","Content-Transfer-Encoding":"8bit","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "}}]