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{ "id": 977, "url": "https://patchwork.libcamera.org/api/1.1/patches/977/?format=api", "web_url": "https://patchwork.libcamera.org/patch/977/", "project": { "id": 1, "url": "https://patchwork.libcamera.org/api/1.1/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": "<20190414013506.10515-9-niklas.soderlund@ragnatech.se>", "date": "2019-04-14T01:35:03", "name": "[libcamera-devel,RFC,08/11] libcamera: media_device: Restrict acquire() and release()", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "e30f9d697fafe46516042924bb2169928b432063", "submitter": { "id": 5, "url": "https://patchwork.libcamera.org/api/1.1/people/5/?format=api", "name": "Niklas Söderlund", "email": "niklas.soderlund@ragnatech.se" }, "delegate": null, "mbox": "https://patchwork.libcamera.org/patch/977/mbox/", "series": [ { "id": 249, "url": "https://patchwork.libcamera.org/api/1.1/series/249/?format=api", "web_url": "https://patchwork.libcamera.org/project/libcamera/list/?series=249", "date": "2019-04-14T01:34:55", "name": "libcamerea: Add support for exclusive access to cameras between processes", "version": 1, "mbox": "https://patchwork.libcamera.org/series/249/mbox/" } ], "comments": "https://patchwork.libcamera.org/api/patches/977/comments/", "check": "pending", "checks": "https://patchwork.libcamera.org/api/patches/977/checks/", "tags": {}, "headers": { "Return-Path": "<niklas.soderlund@ragnatech.se>", "Received": [ "from vsp-unauthed02.binero.net (vsp-unauthed02.binero.net\n\t[195.74.38.227])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 9017D60DCA\n\tfor <libcamera-devel@lists.libcamera.org>;\n\tSun, 14 Apr 2019 03:35:19 +0200 (CEST)", "from bismarck.berto.se (unknown [89.233.230.99])\n\tby bin-vsp-out-02.atm.binero.net (Halon) with ESMTPA\n\tid 8f958efd-5e55-11e9-8e2c-005056917f90;\n\tSun, 14 Apr 2019 03:35:18 +0200 (CEST)" ], "X-Halon-ID": "8f958efd-5e55-11e9-8e2c-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": "Sun, 14 Apr 2019 03:35:03 +0200", "Message-Id": "<20190414013506.10515-9-niklas.soderlund@ragnatech.se>", "X-Mailer": "git-send-email 2.21.0", "In-Reply-To": "<20190414013506.10515-1-niklas.soderlund@ragnatech.se>", "References": "<20190414013506.10515-1-niklas.soderlund@ragnatech.se>", "MIME-Version": "1.0", "Content-Type": "text/plain; charset=UTF-8", "Content-Transfer-Encoding": "8bit", "Subject": "[libcamera-devel] [RFC 08/11] libcamera: media_device: Restrict\n\tacquire() and release()", "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": "Sun, 14 Apr 2019 01:35:20 -0000" }, "content": "The only valid call site for acquire() and release() are inside the\nPipelineHandler base class. Make them private to with a specific friend\nclause to block specific pipeline handler implementations from calling\nthem.\n\nSigned-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>\n---\n src/libcamera/include/media_device.h | 6 +-\n src/libcamera/media_device.cpp | 85 +++++++++++----------\n test/v4l2_device/v4l2_device_test.cpp | 5 --\n test/v4l2_subdevice/v4l2_subdevice_test.cpp | 10 ---\n 4 files changed, 47 insertions(+), 59 deletions(-)", "diff": "diff --git a/src/libcamera/include/media_device.h b/src/libcamera/include/media_device.h\nindex e513a2fee1b91a1b..5d28a7bb8214ef4a 100644\n--- a/src/libcamera/include/media_device.h\n+++ b/src/libcamera/include/media_device.h\n@@ -26,8 +26,6 @@ public:\n \tMediaDevice(const std::string &deviceNode);\n \t~MediaDevice();\n \n-\tbool acquire();\n-\tvoid release();\n \tbool busy() const { return acquired_; }\n \n \tint populate();\n@@ -62,6 +60,10 @@ private:\n \tint open();\n \tvoid close();\n \n+\tfriend class PipelineHandler;\n+\tbool acquire();\n+\tvoid release();\n+\n \tstd::map<unsigned int, MediaObject *> objects_;\n \tMediaObject *object(unsigned int id);\n \tbool addObject(MediaObject *object);\ndiff --git a/src/libcamera/media_device.cpp b/src/libcamera/media_device.cpp\nindex 0138be526f886c90..46931f52688f6c82 100644\n--- a/src/libcamera/media_device.cpp\n+++ b/src/libcamera/media_device.cpp\n@@ -73,48 +73,6 @@ MediaDevice::~MediaDevice()\n \tclear();\n }\n \n-/**\n- * \\brief Claim a device for exclusive use\n- *\n- * The device claiming mechanism offers simple media device access arbitration\n- * between multiple users. When the media device is created, it is available to\n- * all users. Users can query the media graph to determine whether they can\n- * support the device and, if they do, claim the device for exclusive use. Other\n- * users are then expected to skip over media devices in use as reported by the\n- * busy() function.\n- *\n- * Once claimed the device shall be released by its user when not needed anymore\n- * by calling the release() function.\n- *\n- * Exclusive access is only guaranteed if all users of the media device abide by\n- * the device claiming mechanism, as it isn't enforced by the media device\n- * itself.\n- *\n- * \\return true if the device was successfully claimed, or false if it was\n- * already in use\n- * \\sa release(), busy()\n- */\n-bool MediaDevice::acquire()\n-{\n-\tif (acquired_)\n-\t\treturn false;\n-\n-\tif (open())\n-\t\treturn false;\n-\n-\tacquired_ = true;\n-\treturn true;\n-}\n-\n-/**\n- * \\brief Release a device previously claimed for exclusive use\n- * \\sa acquire(), busy()\n- */\n-void MediaDevice::release()\n-{\n-\tclose();\n-\tacquired_ = false;\n-}\n \n /**\n * \\fn MediaDevice::busy()\n@@ -420,6 +378,49 @@ void MediaDevice::close()\n \tfd_ = -1;\n }\n \n+/**\n+ * \\brief Claim a device for exclusive use\n+ *\n+ * The device claiming mechanism offers simple media device access arbitration\n+ * between multiple users. When the media device is created, it is available to\n+ * all users. Users can query the media graph to determine whether they can\n+ * support the device and, if they do, claim the device for exclusive use. Other\n+ * users are then expected to skip over media devices in use as reported by the\n+ * busy() function.\n+ *\n+ * Once claimed the device shall be released by its user when not needed anymore\n+ * by calling the release() function.\n+ *\n+ * Exclusive access is only guaranteed if all users of the media device abide by\n+ * the device claiming mechanism, as it isn't enforced by the media device\n+ * itself.\n+ *\n+ * \\return true if the device was successfully claimed, or false if it was\n+ * already in use\n+ * \\sa release(), busy()\n+ */\n+bool MediaDevice::acquire()\n+{\n+\tif (acquired_)\n+\t\treturn false;\n+\n+\tif (open())\n+\t\treturn false;\n+\n+\tacquired_ = true;\n+\treturn true;\n+}\n+\n+/**\n+ * \\brief Release a device previously claimed for exclusive use\n+ * \\sa acquire(), busy()\n+ */\n+void MediaDevice::release()\n+{\n+\tclose();\n+\tacquired_ = false;\n+}\n+\n /**\n * \\var MediaDevice::objects_\n * \\brief Global map of media objects (entities, pads, links) keyed by their\ndiff --git a/test/v4l2_device/v4l2_device_test.cpp b/test/v4l2_device/v4l2_device_test.cpp\nindex 90e5f7a3ee0c0f2f..833038d56ea4631d 100644\n--- a/test/v4l2_device/v4l2_device_test.cpp\n+++ b/test/v4l2_device/v4l2_device_test.cpp\n@@ -46,9 +46,6 @@ int V4L2DeviceTest::init()\n \tif (!media_)\n \t\treturn TestSkip;\n \n-\tif (!media_->acquire())\n-\t\treturn TestSkip;\n-\n \tMediaEntity *entity = media_->getEntityByName(\"vivid-000-vid-cap\");\n \tif (!entity)\n \t\treturn TestSkip;\n@@ -62,8 +59,6 @@ int V4L2DeviceTest::init()\n \n void V4L2DeviceTest::cleanup()\n {\n-\tmedia_->release();\n-\n \tcapture_->streamOff();\n \tcapture_->releaseBuffers();\n \tcapture_->close();\ndiff --git a/test/v4l2_subdevice/v4l2_subdevice_test.cpp b/test/v4l2_subdevice/v4l2_subdevice_test.cpp\nindex 31f3465a7ba3a5b1..0180698840cc2751 100644\n--- a/test/v4l2_subdevice/v4l2_subdevice_test.cpp\n+++ b/test/v4l2_subdevice/v4l2_subdevice_test.cpp\n@@ -45,16 +45,9 @@ int V4L2SubdeviceTest::init()\n \t\treturn TestSkip;\n \t}\n \n-\tif (!media_->acquire()) {\n-\t\tcerr << \"Unable to acquire media device: \"\n-\t\t << media_->deviceNode() << endl;\n-\t\treturn TestSkip;\n-\t}\n-\n \tMediaEntity *videoEntity = media_->getEntityByName(\"Scaler\");\n \tif (!videoEntity) {\n \t\tcerr << \"Unable to find media entity 'Scaler'\" << endl;\n-\t\tmedia_->release();\n \t\treturn TestFail;\n \t}\n \n@@ -63,7 +56,6 @@ int V4L2SubdeviceTest::init()\n \tif (ret) {\n \t\tcerr << \"Unable to open video subdevice \"\n \t\t << scaler_->deviceNode() << endl;\n-\t\tmedia_->release();\n \t\treturn TestSkip;\n \t}\n \n@@ -72,7 +64,5 @@ int V4L2SubdeviceTest::init()\n \n void V4L2SubdeviceTest::cleanup()\n {\n-\tmedia_->release();\n-\n \tdelete scaler_;\n }\n", "prefixes": [ "libcamera-devel", "RFC", "08/11" ] }