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{ "id": 317, "url": "https://patchwork.libcamera.org/api/patches/317/?format=api", "web_url": "https://patchwork.libcamera.org/patch/317/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/projects/1/?format=api", "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/people/5/?format=api", "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/series/109/?format=api", "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": "<niklas.soderlund@ragnatech.se>", "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 <libcamera-devel@lists.libcamera.org>;\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?= <niklas.soderlund@ragnatech.se>", "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": "<libcamera-devel.lists.libcamera.org>", "List-Unsubscribe": "<https://lists.libcamera.org/options/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=unsubscribe>", "List-Archive": "<https://lists.libcamera.org/pipermail/libcamera-devel/>", "List-Post": "<mailto:libcamera-devel@lists.libcamera.org>", "List-Help": "<mailto:libcamera-devel-request@lists.libcamera.org?subject=help>", "List-Subscribe": "<https://lists.libcamera.org/listinfo/libcamera-devel>,\n\t<mailto:libcamera-devel-request@lists.libcamera.org?subject=subscribe>", "X-List-Received-Date": "Mon, 21 Jan 2019 23:07:15 -0000" }, "content": "From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>\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" ] }