{"id":24089,"url":"https://patchwork.libcamera.org/api/patches/24089/?format=json","web_url":"https://patchwork.libcamera.org/patch/24089/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20250811094926.1308259-2-barnabas.pocze@ideasonboard.com>","date":"2025-08-11T09:49:25","name":"[RFC,v1,1/2] libcamera: base: object: Add `invokeMethod` for lamdas","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"cbd462663e262a8f5975aeef867587a4d9656c3f","submitter":{"id":216,"url":"https://patchwork.libcamera.org/api/people/216/?format=json","name":"Barnabás Pőcze","email":"barnabas.pocze@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/24089/mbox/","series":[{"id":5365,"url":"https://patchwork.libcamera.org/api/series/5365/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=5365","date":"2025-08-11T09:49:24","name":"libcamera: pipeline: virtual: Move image generation to separate thread","version":1,"mbox":"https://patchwork.libcamera.org/series/5365/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/24089/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/24089/checks/","tags":{},"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 55531BDCC1\n\tfor ;\n\tMon, 11 Aug 2025 09:49:34 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id C864969230;\n\tMon, 11 Aug 2025 11:49:31 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[IPv6:2001:4b98:dc2:55:216:3eff:fef7:d647])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id CAFB761464\n\tfor ;\n\tMon, 11 Aug 2025 11:49:29 +0200 (CEST)","from pb-laptop.local (185.221.140.182.nat.pool.zt.hu\n\t[185.221.140.182])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id C997C10D4\n\tfor ;\n\tMon, 11 Aug 2025 11:48:37 +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=\"BU5JXXQZ\"; dkim-atps=neutral","DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1754905717;\n\tbh=+aU5QbLxj/hcBEzsskTkS6MZzydYuIlSDc5zFp7SyGc=;\n\th=From:To:Subject:Date:In-Reply-To:References:From;\n\tb=BU5JXXQZGQJgfOscnKjEcmUQ2HbUfuTYN+wLBpRJBVCNB+gY1TOHV+hufPQGtTD/4\n\tmGr3LGaP8RmJopGgUtTTxTG9QILoZ+fJ4dApmma/q6IWR9xUtuJeitZvXkYNCtLZWD\n\tHMee7xxhc98IlidXfSM7vi2I91bvKi6w82AIEhmQ=","From":"=?utf-8?q?Barnab=C3=A1s_P=C5=91cze?= ","To":"libcamera-devel@lists.libcamera.org","Subject":"[RFC PATCH v1 1/2] libcamera: base: object: Add `invokeMethod` for\n\tlamdas","Date":"Mon, 11 Aug 2025 11:49:25 +0200","Message-ID":"<20250811094926.1308259-2-barnabas.pocze@ideasonboard.com>","X-Mailer":"git-send-email 2.50.1","In-Reply-To":"<20250811094926.1308259-1-barnabas.pocze@ideasonboard.com>","References":"<20250811094926.1308259-1-barnabas.pocze@ideasonboard.com>","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","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\" "},"content":"Add an overload of `invokeMethod` that works the same way as the already\nexisting version but instead of invoking a particular member function,\nit runs a lambda.\n\nSigned-off-by: Barnabás Pőcze \n---\n include/libcamera/base/object.h | 10 ++++++++++\n src/libcamera/base/object.cpp | 24 +++++++++++++++++++++++-\n 2 files changed, 33 insertions(+), 1 deletion(-)","diff":"diff --git a/include/libcamera/base/object.h b/include/libcamera/base/object.h\nindex a24f84ff9..3f004499f 100644\n--- a/include/libcamera/base/object.h\n+++ b/include/libcamera/base/object.h\n@@ -43,6 +43,16 @@ public:\n \t\treturn method->activate(std::forward(args)..., true);\n \t}\n \n+\ttemplate> * = nullptr>\n+\tauto invokeMethod(Func func, ConnectionType type)\n+\t\t-> std::invoke_result_t\n+\t{\n+\t\tusing R = std::invoke_result_t;\n+\t\tauto *method = new BoundMethodFunctor(this, this, std::move(func), type);\n+\t\treturn method->activate(true);\n+\t}\n+\n \tThread *thread() const { return thread_; }\n \tvoid moveToThread(Thread *thread);\n \ndiff --git a/src/libcamera/base/object.cpp b/src/libcamera/base/object.cpp\nindex 37d133cc7..98937784c 100644\n--- a/src/libcamera/base/object.cpp\n+++ b/src/libcamera/base/object.cpp\n@@ -255,7 +255,7 @@ bool Object::assertThreadBound(const char *message)\n }\n \n /**\n- * \\fn R Object::invokeMethod()\n+ * \\fn Object::invokeMethod(R (T::*func)(FuncArgs...), ConnectionType type, Args &&...args)\n * \\brief Invoke a method asynchronously on an Object instance\n * \\param[in] func The object method to invoke\n * \\param[in] type Connection type for method invocation\n@@ -280,6 +280,28 @@ bool Object::assertThreadBound(const char *message)\n * connection type ConnectionTypeQueued, return a default-constructed R value.\n */\n \n+/**\n+ * \\fn Object::invokeMethod(Func func, ConnectionType type)\n+ * \\brief Invoke a lambda in the thread of an Object instance\n+ * \\param[in] func The object method to invoke\n+ * \\param[in] type Connection type for method invocation\n+ *\n+ * This function invokes the lambda \\a func without arguments, based on the\n+ * connection \\a type wrt. the Object instance. Depending on the type, the method\n+ * will be called synchronously in the same thread or asynchronously in the\n+ * object's thread.\n+ *\n+ * Due to the asynchronous nature of threads, asynchronous invocations with the\n+ * ConnectionTypeQueued type are not guaranteed to be called before the thread\n+ * is stopped. See \\ref thread-stop for additional information.\n+ *\n+ * \\context This function is \\threadsafe.\n+ *\n+ * \\return For connection types ConnectionTypeDirect and\n+ * ConnectionTypeBlocking, return the return value of the invoked method. For\n+ * connection type ConnectionTypeQueued, return a default-constructed R value.\n+ */\n+\n /**\n * \\fn Object::thread()\n * \\brief Retrieve the thread the object is bound to\n","prefixes":["RFC","v1","1/2"]}