{"id":378,"url":"https://patchwork.libcamera.org/api/1.1/patches/378/?format=json","web_url":"https://patchwork.libcamera.org/patch/378/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/1.1/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":"<20190125145417.5384-1-laurent.pinchart@ideasonboard.com>","date":"2019-01-25T14:54:17","name":"[libcamera-devel] cam: Add event loop","commit_ref":"71ef5532d9777e9511bc982cab33e3d2d95cf4be","pull_url":null,"state":"accepted","archived":false,"hash":"858b03f09e5cf63d765482be03da3b90081eb373","submitter":{"id":2,"url":"https://patchwork.libcamera.org/api/1.1/people/2/?format=json","name":"Laurent Pinchart","email":"laurent.pinchart@ideasonboard.com"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/378/mbox/","series":[{"id":131,"url":"https://patchwork.libcamera.org/api/1.1/series/131/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=131","date":"2019-01-25T14:54:17","name":"[libcamera-devel] cam: Add event loop","version":1,"mbox":"https://patchwork.libcamera.org/series/131/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/378/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/378/checks/","tags":{},"headers":{"Return-Path":"","Received":["from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 75D9660B1D\n\tfor ;\n\tFri, 25 Jan 2019 15:54:24 +0100 (CET)","from pendragon.home (unknown\n\t[IPv6:2a02:a03f:4499:2700:1060:1d4c:d6a:8e80])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id ECA13325\n\tfor ;\n\tFri, 25 Jan 2019 15:54:20 +0100 (CET)"],"DKIM-Signature":"v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1548428061;\n\tbh=WgJyvxZAT4V1OiJYdki6SXSK3lNV1pqyRymoATteDt0=;\n\th=From:To:Subject:Date:From;\n\tb=UdcSnmizGRVL6OlF0gLHjoZdG+HDtQV6W1CRcSVpoqIgHx+itO9y2Ne4osbD194PK\n\tQzaYnXAZPes+btFooIxDbxZDrt+eWvEcNDq1S8JMIWo2exmrUEkxxQhp2QS4ls+9x0\n\t7QCas92td1+xPToiHFo9aOEXbfc/K/Xx7b7j3Rig=","From":"Laurent Pinchart ","To":"libcamera-devel@lists.libcamera.org","Date":"Fri, 25 Jan 2019 16:54:17 +0200","Message-Id":"<20190125145417.5384-1-laurent.pinchart@ideasonboard.com>","X-Mailer":"git-send-email 2.19.2","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH] cam: Add event loop","X-BeenThere":"libcamera-devel@lists.libcamera.org","X-Mailman-Version":"2.1.23","Precedence":"list","List-Id":"","List-Unsubscribe":",\n\t","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n\t","X-List-Received-Date":"Fri, 25 Jan 2019 14:54:24 -0000"},"content":"Add a simple event loop to the cam application and use it in the main()\nfunction, with an example of how to handle SIGINT to gracefully stop the\nloop.\n\nSigned-off-by: Laurent Pinchart \n---\n src/cam/event_loop.cpp | 39 +++++++++++++++++++++++++++++++++++++++\n src/cam/event_loop.h | 34 ++++++++++++++++++++++++++++++++++\n src/cam/main.cpp | 22 +++++++++++++++++++++-\n src/cam/meson.build | 1 +\n 4 files changed, 95 insertions(+), 1 deletion(-)\n create mode 100644 src/cam/event_loop.cpp\n create mode 100644 src/cam/event_loop.h","diff":"diff --git a/src/cam/event_loop.cpp b/src/cam/event_loop.cpp\nnew file mode 100644\nindex 000000000000..e8ab861790ed\n--- /dev/null\n+++ b/src/cam/event_loop.cpp\n@@ -0,0 +1,39 @@\n+/* SPDX-License-Identifier: GPL-2.0-or-later */\n+/*\n+ * Copyright (C) 2019, Google Inc.\n+ *\n+ * event_loop.cpp - cam - Event loop\n+ */\n+\n+#include \n+\n+#include \"event_loop.h\"\n+\n+using namespace libcamera;\n+\n+EventLoop::EventLoop(EventDispatcher *dispatcher)\n+\t: dispatcher_(dispatcher)\n+{\n+}\n+\n+EventLoop::~EventLoop()\n+{\n+}\n+\n+int EventLoop::exec()\n+{\n+\texitCode_ = -1;\n+\texit_.store(false, std::memory_order_release);\n+\n+\twhile (!exit_.load(std::memory_order_acquire))\n+\t\tdispatcher_->processEvents();\n+\n+\treturn exitCode_;\n+}\n+\n+void EventLoop::exit(int code)\n+{\n+\texitCode_ = code;\n+\texit_.store(true, std::memory_order_release);\n+\tdispatcher_->interrupt();\n+}\ndiff --git a/src/cam/event_loop.h b/src/cam/event_loop.h\nnew file mode 100644\nindex 000000000000..aaca5838f979\n--- /dev/null\n+++ b/src/cam/event_loop.h\n@@ -0,0 +1,34 @@\n+/* SPDX-License-Identifier: GPL-2.0-or-later */\n+/*\n+ * Copyright (C) 2019, Google Inc.\n+ *\n+ * event_loop.h - cam - Event loop\n+ */\n+#ifndef __CAM_EVENT_LOOP_H__\n+#define __CAM_EVENT_LOOP_H__\n+\n+#include \n+\n+#include \n+\n+namespace libcamera {\n+class EventDispatcher;\n+};\n+\n+class EventLoop\n+{\n+public:\n+\tEventLoop(libcamera::EventDispatcher *dispatcher);\n+\t~EventLoop();\n+\n+\tint exec();\n+\tvoid exit(int code = 0);\n+\n+private:\n+\tlibcamera::EventDispatcher *dispatcher_;\n+\n+\tstd::atomic exit_;\n+\tint exitCode_;\n+};\n+\n+#endif /* __CAM_EVENT_LOOP_H__ */\ndiff --git a/src/cam/main.cpp b/src/cam/main.cpp\nindex 0d37039f5349..cb98d302dcf3 100644\n--- a/src/cam/main.cpp\n+++ b/src/cam/main.cpp\n@@ -7,10 +7,12 @@\n \n #include \n #include \n+#include \n #include \n \n #include \n \n+#include \"event_loop.h\"\n #include \"options.h\"\n \n using namespace libcamera;\n@@ -23,6 +25,14 @@ enum {\n \tOptList = 'l',\n };\n \n+EventLoop *loop;\n+\n+void signalHandler(int signal)\n+{\n+\tstd::cout << \"Exiting\" << std::endl;\n+\tloop->exit();\n+}\n+\n static int parseOptions(int argc, char *argv[])\n {\n \tOptionsParser parser;\n@@ -79,7 +89,17 @@ int main(int argc, char **argv)\n \t\t}\n \t}\n \n+\tloop = new EventLoop(cm->eventDispatcher());\n+\n+\tstruct sigaction sa = {};\n+\tsa.sa_handler = &signalHandler;\n+\tsigaction(SIGINT, &sa, nullptr);\n+\n+\tret = loop->exec();\n+\n+\tdelete loop;\n+\n \tcm->stop();\n \n-\treturn 0;\n+\treturn ret;\n }\ndiff --git a/src/cam/meson.build b/src/cam/meson.build\nindex e45e5391f679..cc647523955f 100644\n--- a/src/cam/meson.build\n+++ b/src/cam/meson.build\n@@ -1,4 +1,5 @@\n cam_sources = files([\n+ 'event_loop.cpp',\n 'main.cpp',\n 'options.cpp',\n ])\n","prefixes":["libcamera-devel"]}