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[24.28.70.239]) by smtp.gmail.com with ESMTPSA id u81sm2658477oie.11.2015.08.05.15.55.36 (version=TLSv1.2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Wed, 05 Aug 2015 15:55:37 -0700 (PDT) From: Bill Fischofer To: lng-odp@lists.linaro.org Date: Wed, 5 Aug 2015 17:55:20 -0500 Message-Id: <1438815321-12344-13-git-send-email-bill.fischofer@linaro.org> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1438815321-12344-1-git-send-email-bill.fischofer@linaro.org> References: <1438815321-12344-1-git-send-email-bill.fischofer@linaro.org> X-Topics: patch Subject: [lng-odp] [API-NEXT PATCHv8 12/13] api: schedule: add odp_schedule_order_lock/unlock 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 209.85.217.174 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/schedule.h | 78 ++++++++++++++++++++++++---------------------- 1 file changed, 41 insertions(+), 37 deletions(-) diff --git a/include/odp/api/schedule.h b/include/odp/api/schedule.h index ea16583..2762bdd 100644 --- a/include/odp/api/schedule.h +++ b/include/odp/api/schedule.h @@ -174,6 +174,42 @@ void odp_schedule_release_atomic(void); int odp_schedule_release_ordered(odp_event_t ev); /** + * Ordered event lock + * + * While odp_schedule_order_sync() permits code to be serialized once per + * event, odp_schedule_order_lock() provides reusable in-order serialization + * for scheduled ordered events. Upon return the caller is in order with + * respect to other events originating from the current ordered context and + * will retain order until a subsequent odp_schedule_order_unlock() call is + * made, or until order is resolved for the event via a call to + * odp_queue_enq() or odp_schedule_release_ordered(). If the caller holds + * multiple events, e.g., as received from odp_schedule_multi(), then the + * list of events may only be locked in their received order to avoid + * deadlock. That is, if the caller received events 1, 2, and 3 from + * odp_schedule_multi(), it is an error to attempt to lock event 2 before + * locking and unlocking event 1 or otherwise resolving event 1's order. + * + * @param ev The event whose order is to be locked. This event MUST have + * originated from an ordered queue. + */ +void odp_schedule_order_lock(odp_event_t ev); + +/** + * Ordered event unlock + * + * Releases an ordered lock previously acquired by odp_schedule_order_lock(). + * It is an error to attempt to release a lock that had not been previously + * acquired for the specified event. Following this call, the thread will + * exit the critical section protected by the ordered lock and will resume + * parallel execution until the next call to odp_schedule_order_lock() for + * that event, or until the event's order is resolved by a call to + * odp_queue_enq() or odp_schedule_release_ordered(). + * + * @param ev The event whose order is to be unlocked. + */ +void odp_schedule_order_unlock(odp_event_t ev); + +/** * Copy order from one event to another * * This call copies the order associated with an event originating from an @@ -189,6 +225,11 @@ int odp_schedule_release_ordered(odp_event_t ev); * * @retval 0 Success * @retval <0 Failure. Order not copied. + * + * @note If multiple events share the same order as a result of + * odp_schedule_order_copy(), only one of them should attempt to lock the + * order via calls to odp_schedule_order_lock(). Results are undefined if this + * restriction is not observed. */ int odp_schedule_order_copy(odp_event_t src_event, odp_event_t dst_event); @@ -336,43 +377,6 @@ int odp_schedule_group_leave(odp_schedule_group_t group, int odp_schedule_group_count(odp_schedule_group_t group); /** - * Initialize ordered context lock - * - * Initialize an ordered queue context lock. The lock can be associated only - * with ordered queues and used only within an ordered synchronization context. - * - * @param queue Ordered queue - * @param lock Ordered context lock - * - * @retval 0 on success - * @retval <0 on failure - */ -int odp_schedule_olock_init(odp_queue_t queue, odp_schedule_olock_t *lock); - -/** - * Acquire ordered context lock - * - * This call is valid only when holding an ordered synchronization context. The - * lock is used to protect a critical section that is executed within an - * ordered context. Threads enter the critical section in the order determined - * by the context (source queue). Lock ordering is automatically skipped for - * threads that release the context instead of calling the lock. - * - * @param lock Ordered context lock - */ -void odp_schedule_olock_lock(odp_schedule_olock_t *lock); - -/** - * Release ordered context lock - * - * This call is valid only when holding an ordered synchronization context. - * Release a previously locked ordered context lock. - * - * @param lock Ordered context lock - */ -void odp_schedule_olock_unlock(odp_schedule_olock_t *lock); - -/** * @} */