{"id":16356,"url":"https://patchwork.libcamera.org/api/1.1/patches/16356/?format=json","web_url":"https://patchwork.libcamera.org/patch/16356/","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":"<20220623232210.18742-11-laurent.pinchart@ideasonboard.com>","date":"2022-06-23T23:22:07","name":"[libcamera-devel,10/13] gstreamer: Fix pads locking","commit_ref":null,"pull_url":null,"state":"accepted","archived":false,"hash":"1444328d2b7556ccd31f1f6c0ac4b1e09ceb0018","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/16356/mbox/","series":[{"id":3214,"url":"https://patchwork.libcamera.org/api/1.1/series/3214/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=3214","date":"2022-06-23T23:21:57","name":"gstreamer: Queue multiple requests","version":1,"mbox":"https://patchwork.libcamera.org/series/3214/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/16356/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/16356/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 0A14BBD808\n\tfor ;\n\tThu, 23 Jun 2022 23:22:48 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id A489665659;\n\tFri, 24 Jun 2022 01:22:47 +0200 (CEST)","from perceval.ideasonboard.com (perceval.ideasonboard.com\n\t[213.167.242.64])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 8638F65645\n\tfor ;\n\tFri, 24 Jun 2022 01:22:33 +0200 (CEST)","from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57])\n\tby perceval.ideasonboard.com (Postfix) with ESMTPSA id 0E18E80A;\n\tFri, 24 Jun 2022 01:22:32 +0200 (CEST)"],"DKIM-Signature":["v=1; a=rsa-sha256; c=relaxed/simple; d=libcamera.org;\n\ts=mail; t=1656026567;\n\tbh=/q7FTUIgh7FCA3PW9417UeXt7frh0GiAoe4hGHSb3EE=;\n\th=To:Date:In-Reply-To:References:Subject:List-Id:List-Unsubscribe:\n\tList-Archive:List-Post:List-Help:List-Subscribe:From:Reply-To:Cc:\n\tFrom;\n\tb=BOi/HOUQ2o/8p4wROtzau5RxMq31oqfDHMISmmNW5A7EEUfQW16f+WFD7DsKsZ8dH\n\tovTtLIG+8gMm3VB2L5L/Ym7EZNp3TXPn3NM+0Q/7nv7N3KqR0ydbJGuPJ5x6m04Lsi\n\tjkxrGcBnqTqeVyYlhx7xQ3rQsAyeyg6IsFTypMGhBvR40yXGP0O0gaP1jsJs591/5F\n\t8oc2EhWwNvn+OTKI5iPTNThioG6JxBURCz+jQiEdpAAL4Vl6gUDNhye4DzOo74cRNg\n\twBh506H/1sq1ZzGePKod5mkirArrRWCQ5/usY4xiSMoAUPf4XalKC9uavdRqzeWUsc\n\t6nq6hIwOVTVFA==","v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com;\n\ts=mail; t=1656026553;\n\tbh=/q7FTUIgh7FCA3PW9417UeXt7frh0GiAoe4hGHSb3EE=;\n\th=From:To:Cc:Subject:Date:In-Reply-To:References:From;\n\tb=mETVWfuw/DXpx6FqBuwo3tCuXNVVY58LMgbiUE+dmWhzvYV9iBbrCqQqEzXkNsfYM\n\tnmSnRAlVLsC/Y26C83lEUvjGk63uUDhJ+xEEyqYhL9THxRgaihuRPYs0sox+OK35oS\n\twlHsj3Z/Yon7gxF7vN7DJQxiY6D3aFG2jvBnmVDY="],"Authentication-Results":"lancelot.ideasonboard.com; dkim=pass (1024-bit key; \n\tunprotected) header.d=ideasonboard.com\n\theader.i=@ideasonboard.com\n\theader.b=\"mETVWfuw\"; dkim-atps=neutral","To":"libcamera-devel@lists.libcamera.org","Date":"Fri, 24 Jun 2022 02:22:07 +0300","Message-Id":"<20220623232210.18742-11-laurent.pinchart@ideasonboard.com>","X-Mailer":"git-send-email 2.35.1","In-Reply-To":"<20220623232210.18742-1-laurent.pinchart@ideasonboard.com>","References":"<20220623232210.18742-1-laurent.pinchart@ideasonboard.com>","MIME-Version":"1.0","Content-Transfer-Encoding":"8bit","Subject":"[libcamera-devel] [PATCH 10/13] gstreamer: Fix pads locking","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","From":"Laurent Pinchart via libcamera-devel\n\t","Reply-To":"Laurent Pinchart ","Cc":"Nicolas Dufresne ,\n\tVedant Paranjape ","Errors-To":"libcamera-devel-bounces@lists.libcamera.org","Sender":"\"libcamera-devel\" "},"content":"The srcpads_ vector is protected by two different locks, the GstObject\nlock of the libcamerasrc element, and the stream_lock that covers the\nrun function of the thread. This isn't correct. Use the stream_lock\nconsistently to protect the pads.\n\nSigned-off-by: Laurent Pinchart \n---\n src/gstreamer/gstlibcamerasrc.cpp | 68 ++++++++++++++++---------------\n 1 file changed, 35 insertions(+), 33 deletions(-)","diff":"diff --git a/src/gstreamer/gstlibcamerasrc.cpp b/src/gstreamer/gstlibcamerasrc.cpp\nindex b85ba39fb808..58a322b251c7 100644\n--- a/src/gstreamer/gstlibcamerasrc.cpp\n+++ b/src/gstreamer/gstlibcamerasrc.cpp\n@@ -112,7 +112,8 @@ struct GstLibcameraSrcState {\n \tstd::shared_ptr cm_;\n \tstd::shared_ptr cam_;\n \tstd::unique_ptr config_;\n-\tstd::vector srcpads_;\n+\n+\tstd::vector srcpads_; /* Protected by stream_lock */\n \n \tMutex lock_;\n \tstd::queue> queuedRequests_\n@@ -349,36 +350,34 @@ gst_libcamera_src_task_run(gpointer user_data)\n \t\t\t\t\t\t\tsrcpad, ret);\n \t}\n \n+\tif (ret != GST_FLOW_OK) {\n+\t\tif (ret == GST_FLOW_EOS) {\n+\t\t\tg_autoptr(GstEvent) eos = gst_event_new_eos();\n+\t\t\tguint32 seqnum = gst_util_seqnum_next();\n+\t\t\tgst_event_set_seqnum(eos, seqnum);\n+\t\t\tfor (GstPad *srcpad : state->srcpads_)\n+\t\t\t\tgst_pad_push_event(srcpad, gst_event_ref(eos));\n+\t\t} else if (ret != GST_FLOW_FLUSHING) {\n+\t\t\tGST_ELEMENT_FLOW_ERROR(self, ret);\n+\t\t}\n+\t\tgst_task_stop(self->task);\n+\t\treturn;\n+\t}\n+\n+\t/*\n+\t * Here we need to decide if we want to pause. This needs to\n+\t * happen in lock step with the callback thread which may want\n+\t * to resume the task and might push pending buffers.\n+\t */\n+\tbool do_pause;\n+\n \t{\n-\t\tif (ret != GST_FLOW_OK) {\n-\t\t\tif (ret == GST_FLOW_EOS) {\n-\t\t\t\tg_autoptr(GstEvent) eos = gst_event_new_eos();\n-\t\t\t\tguint32 seqnum = gst_util_seqnum_next();\n-\t\t\t\tgst_event_set_seqnum(eos, seqnum);\n-\t\t\t\tfor (GstPad *srcpad : state->srcpads_)\n-\t\t\t\t\tgst_pad_push_event(srcpad, gst_event_ref(eos));\n-\t\t\t} else if (ret != GST_FLOW_FLUSHING) {\n-\t\t\t\tGST_ELEMENT_FLOW_ERROR(self, ret);\n-\t\t\t}\n-\t\t\tgst_task_stop(self->task);\n-\t\t\treturn;\n-\t\t}\n-\n-\t\t/*\n-\t\t * Here we need to decide if we want to pause. This needs to\n-\t\t * happen in lock step with the callback thread which may want\n-\t\t * to resume the task and might push pending buffers.\n-\t\t */\n-\t\tbool do_pause;\n-\n-\t\t{\n-\t\t\tMutexLocker locker(state->lock_);\n-\t\t\tdo_pause = state->completedRequests_.empty();\n-\t\t}\n-\n-\t\tif (do_pause)\n-\t\t\tgst_task_pause(self->task);\n+\t\tMutexLocker locker(state->lock_);\n+\t\tdo_pause = state->completedRequests_.empty();\n \t}\n+\n+\tif (do_pause)\n+\t\tgst_task_pause(self->task);\n }\n \n static void\n@@ -532,8 +531,11 @@ gst_libcamera_src_task_leave([[maybe_unused]] GstTask *task,\n \t\tstate->completedRequests_ = {};\n \t}\n \n-\tfor (GstPad *srcpad : state->srcpads_)\n-\t\tgst_libcamera_pad_set_pool(srcpad, nullptr);\n+\t{\n+\t\tGLibRecLocker locker(&self->stream_lock);\n+\t\tfor (GstPad *srcpad : state->srcpads_)\n+\t\t\tgst_libcamera_pad_set_pool(srcpad, nullptr);\n+\t}\n \n \tg_clear_object(&self->allocator);\n \tg_clear_pointer(&self->flow_combiner,\n@@ -692,7 +694,7 @@ gst_libcamera_src_request_new_pad(GstElement *element, GstPadTemplate *templ,\n \tg_object_ref_sink(pad);\n \n \tif (gst_element_add_pad(element, pad)) {\n-\t\tGLibLocker lock(GST_OBJECT(self));\n+\t\tGLibRecLocker lock(&self->stream_lock);\n \t\tself->state->srcpads_.push_back(reinterpret_cast(g_object_ref(pad)));\n \t} else {\n \t\tGST_ELEMENT_ERROR(element, STREAM, FAILED,\n@@ -712,7 +714,7 @@ gst_libcamera_src_release_pad(GstElement *element, GstPad *pad)\n \tGST_DEBUG_OBJECT(self, \"Pad %\" GST_PTR_FORMAT \" being released\", pad);\n \n \t{\n-\t\tGLibLocker lock(GST_OBJECT(self));\n+\t\tGLibRecLocker lock(&self->stream_lock);\n \t\tstd::vector &pads = self->state->srcpads_;\n \t\tauto begin_iterator = pads.begin();\n \t\tauto end_iterator = pads.end();\n","prefixes":["libcamera-devel","10/13"]}