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116 lines
4.1 KiB
116 lines
4.1 KiB
/* |
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Copyright (c) 2012, Broadcom Europe Ltd |
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All rights reserved. |
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Redistribution and use in source and binary forms, with or without |
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modification, are permitted provided that the following conditions are met: |
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* Redistributions of source code must retain the above copyright |
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notice, this list of conditions and the following disclaimer. |
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* Redistributions in binary form must reproduce the above copyright |
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notice, this list of conditions and the following disclaimer in the |
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documentation and/or other materials provided with the distribution. |
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* Neither the name of the copyright holder nor the |
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names of its contributors may be used to endorse or promote products |
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derived from this software without specific prior written permission. |
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND |
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ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY |
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DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES |
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(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
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SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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*/ |
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#ifndef MMAL_QUEUE_H |
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#define MMAL_QUEUE_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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/** \defgroup MmalQueue Queues of buffer headers |
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* This provides a thread-safe implementation of a queue of buffer headers |
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* (\ref MMAL_BUFFER_HEADER_T). The queue works in a first-in, first-out basis |
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* so the buffer headers will be dequeued in the order they have been queued. */ |
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/* @{ */ |
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#include "mmal_buffer.h" |
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typedef struct MMAL_QUEUE_T MMAL_QUEUE_T; |
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/** Create a queue of MMAL_BUFFER_HEADER_T |
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* |
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* @return Pointer to the newly created queue or NULL on failure. |
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*/ |
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MMAL_QUEUE_T *mmal_queue_create(void); |
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/** Put a MMAL_BUFFER_HEADER_T into a queue |
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* |
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* @param queue Pointer to a queue |
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* @param buffer Pointer to the MMAL_BUFFER_HEADER_T to add to the queue |
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*/ |
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void mmal_queue_put(MMAL_QUEUE_T *queue, MMAL_BUFFER_HEADER_T *buffer); |
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/** Put a MMAL_BUFFER_HEADER_T back at the start of a queue. |
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* This is used when a buffer header was removed from the queue but not |
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* fully processed and needs to be put back where it was originally taken. |
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* |
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* @param queue Pointer to a queue |
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* @param buffer Pointer to the MMAL_BUFFER_HEADER_T to add to the queue |
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*/ |
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void mmal_queue_put_back(MMAL_QUEUE_T *queue, MMAL_BUFFER_HEADER_T *buffer); |
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/** Get a MMAL_BUFFER_HEADER_T from a queue |
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* |
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* @param queue Pointer to a queue |
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* |
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* @return pointer to the next MMAL_BUFFER_HEADER_T or NULL if the queue is empty. |
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*/ |
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MMAL_BUFFER_HEADER_T *mmal_queue_get(MMAL_QUEUE_T *queue); |
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/** Wait for a MMAL_BUFFER_HEADER_T from a queue. |
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* This is the same as a get except that this will block until a buffer header is |
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* available. |
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* |
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* @param queue Pointer to a queue |
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* |
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* @return pointer to the next MMAL_BUFFER_HEADER_T. |
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*/ |
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MMAL_BUFFER_HEADER_T *mmal_queue_wait(MMAL_QUEUE_T *queue); |
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/** Wait for a MMAL_BUFFER_HEADER_T from a queue, up to a given timeout. |
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* This is the same as a wait, except that it will abort in case of timeout. |
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* |
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* @param queue Pointer to a queue |
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* @param timeout Number of milliseconds to wait before |
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* returning if the semaphore can't be acquired. |
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* |
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* @return pointer to the next MMAL_BUFFER_HEADER_T. |
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*/ |
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MMAL_BUFFER_HEADER_T *mmal_queue_timedwait(MMAL_QUEUE_T *queue, VCOS_UNSIGNED timeout); |
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/** Get the number of MMAL_BUFFER_HEADER_T currently in a queue. |
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* |
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* @param queue Pointer to a queue |
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* |
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* @return length (in elements) of the queue. |
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*/ |
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unsigned int mmal_queue_length(MMAL_QUEUE_T *queue); |
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/** Destroy a queue of MMAL_BUFFER_HEADER_T. |
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* |
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* @param queue Pointer to a queue |
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*/ |
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void mmal_queue_destroy(MMAL_QUEUE_T *queue); |
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/* @} */ |
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#ifdef __cplusplus |
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} |
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#endif |
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#endif /* MMAL_QUEUE_H */
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