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[24.28.70.239]) by smtp.gmail.com with ESMTPSA id f128sm338865oig.2.2015.08.07.04.47.28 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 07 Aug 2015 04:47:28 -0700 (PDT) From: Bill Fischofer To: lng-odp@lists.linaro.org Date: Fri, 7 Aug 2015 06:47:11 -0500 Message-Id: <1438948036-31868-9-git-send-email-bill.fischofer@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1438948036-31868-1-git-send-email-bill.fischofer@linaro.org> References: <1438948036-31868-1-git-send-email-bill.fischofer@linaro.org> X-Topics: patch Subject: [lng-odp] [API-NEXT PATCHv9 08/13] api: queue: document ordered chain enq support X-BeenThere: lng-odp@lists.linaro.org X-Mailman-Version: 2.1.16 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: , List-Help: , List-Subscribe: , MIME-Version: 1.0 Errors-To: lng-odp-bounces@lists.linaro.org Sender: "lng-odp" X-Removed-Original-Auth: Dkim didn't pass. X-Original-Sender: bill.fischofer@linaro.org X-Original-Authentication-Results: mx.google.com; spf=pass (google.com: domain of patch+caf_=patchwork-forward=linaro.org@linaro.org designates 209.85.217.178 as permitted sender) smtp.mail=patch+caf_=patchwork-forward=linaro.org@linaro.org Mailing-list: list patchwork-forward@linaro.org; contact patchwork-forward+owners@linaro.org X-Google-Group-Id: 836684582541 Signed-off-by: Bill Fischofer --- include/odp/api/queue.h | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/include/odp/api/queue.h b/include/odp/api/queue.h index ce04eb4..5a6dbc0 100644 --- a/include/odp/api/queue.h +++ b/include/odp/api/queue.h @@ -173,6 +173,29 @@ int odp_queue_enq(odp_queue_t queue, odp_event_t ev); * * @return Number of events actually enqueued (0 ... num) * @retval <0 on failure + * + * @note odp_queue_enq_multi() serves two purposes. First, it allows + * multiple events to be enqueued via a single call. In addition, it + * permits multiple events to partitipate in ordering. When an event + * originating from an ordered queue is followed by one or more events + * that did not originate from an ordered queue, then these subsequent + * events are "chained" to the ordered event such that they participate + * in its ordering. This provides a convenient means for an application + * to split a packet into multiple packets and have them retain the + * relative order of the original packet. + * + * @note If multiple events originating from ordered queues are passed + * to odp_queue_enq_multi() then they (and their associated chains, if + * any) are handled independently. To see this, consider the following + * array of events: uo1, uo2, o1, uo3, uo4, o2, o3, uo5. When this + * array is passed to odp_queue_enq_multi() then unordered events uo1 and + * uo2 will be added to queue, then ordered event o1 and the chained + * events uo3, and uo4, will be added, then ordered event o2, then ordered + * event o3 and the chained event uo5 will be added. In all cases, + * unordered events that are chained to ordered events inherit the relative + * order of their ordered lead event. Note also that there is no + * requirement that the ordered events passed to this routine all originate + * from the same ordered queue sine each is treated independently. */ int odp_queue_enq_multi(odp_queue_t queue, const odp_event_t events[], int num);