{"id":317,"url":"https://patchwork.libcamera.org/api/1.1/patches/317/?format=json","web_url":"https://patchwork.libcamera.org/patch/317/","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":"<20190121230640.8783-2-niklas.soderlund@ragnatech.se>","date":"2019-01-21T23:06:37","name":"[libcamera-devel,RFC,1/4] libcamera: camera: Add acquire() and release()","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"389c173792e7cacedae4cd7e5a4a897701908b64","submitter":{"id":5,"url":"https://patchwork.libcamera.org/api/1.1/people/5/?format=json","name":"Niklas Söderlund","email":"niklas.soderlund@ragnatech.se"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/317/mbox/","series":[{"id":109,"url":"https://patchwork.libcamera.org/api/1.1/series/109/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=109","date":"2019-01-21T23:06:36","name":"libcamera: add base for applications to configure cameras","version":1,"mbox":"https://patchwork.libcamera.org/series/109/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/317/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/317/checks/","tags":{},"headers":{"Return-Path":"","Received":["from bin-mail-out-06.binero.net (bin-mail-out-06.binero.net\n\t[195.74.38.229])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 5D08360B2D\n\tfor ;\n\tTue, 22 Jan 2019 00:07:15 +0100 (CET)","from bismarck.berto.se (unknown [89.233.230.99])\n\tby bin-vsp-out-02.atm.binero.net (Halon) with ESMTPA\n\tid 4916dae7-1dd1-11e9-874f-005056917f90;\n\tTue, 22 Jan 2019 00:07:12 +0100 (CET)"],"X-Halon-ID":"4916dae7-1dd1-11e9-874f-005056917f90","Authorized-sender":"niklas@soderlund.pp.se","From":"=?utf-8?q?Niklas_S=C3=B6derlund?= ","To":"libcamera-devel@lists.libcamera.org","Date":"Tue, 22 Jan 2019 00:06:37 +0100","Message-Id":"<20190121230640.8783-2-niklas.soderlund@ragnatech.se>","X-Mailer":"git-send-email 2.20.1","In-Reply-To":"<20190121230640.8783-1-niklas.soderlund@ragnatech.se>","References":"<20190121230640.8783-1-niklas.soderlund@ragnatech.se>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [RFC 1/4] libcamera: camera: Add acquire() and\n\trelease()","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":"Mon, 21 Jan 2019 23:07:15 -0000"},"content":"From: Laurent Pinchart \n\n---\n include/libcamera/camera.h | 5 +++++\n src/libcamera/camera.cpp | 33 +++++++++++++++++++++++++++++++++\n 2 files changed, 38 insertions(+)","diff":"diff --git a/include/libcamera/camera.h b/include/libcamera/camera.h\nindex 2ea1a6883311cf9f..03b285c840c246e1 100644\n--- a/include/libcamera/camera.h\n+++ b/include/libcamera/camera.h\n@@ -22,11 +22,16 @@ public:\n \n \tconst std::string &name() const;\n \n+\tint acquire();\n+\tvoid release();\n+\n private:\n \texplicit Camera(const std::string &name);\n \t~Camera();\n \n \tstd::string name_;\n+\n+\tbool acquired_;\n };\n \n } /* namespace libcamera */\ndiff --git a/src/libcamera/camera.cpp b/src/libcamera/camera.cpp\nindex acf912bee95cbec4..b80bc36e410a6e0a 100644\n--- a/src/libcamera/camera.cpp\n+++ b/src/libcamera/camera.cpp\n@@ -92,4 +92,37 @@ Camera::~Camera()\n {\n }\n \n+/**\n+ * \\brief Acquire the camera device for exclusive access\n+ *\n+ * After opening the device with open(), exclusive access must be obtained\n+ * before performing operations that change the device state. This function is\n+ * not blocking, if the device has already been acquired (by the same or another\n+ * process) the -EBUSY error code is returned.\n+ *\n+ * Once exclusive access isn't needed anymore, the device should be released\n+ * with a call to the release() function.\n+ *\n+ * \\return 0 on success or a negative error code on error.\n+ */\n+int Camera::acquire()\n+{\n+\tif (acquired_)\n+\t\treturn -EBUSY;\n+\n+\tacquired_ = true;\n+\treturn 0;\n+}\n+\n+/**\n+ * \\brief Release exclusive access to the camera device\n+ *\n+ * Releasing the camera device allows other users to acquire exclusive access\n+ * with the acquire() function.\n+ */\n+void Camera::release()\n+{\n+\tacquired_ = false;\n+}\n+\n } /* namespace libcamera */\n","prefixes":["libcamera-devel","RFC","1/4"]}