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- /****************************************************************************
- * mm/iob/iob_add_queue.c
- *
- * Copyright (C) 2014 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <assert.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/mm/iob.h>
- #include "iob.h"
- #if CONFIG_IOB_NCHAINS > 0
- /****************************************************************************
- * Pre-processor Definitions
- ****************************************************************************/
- #ifndef NULL
- # define NULL ((FAR void *)0)
- #endif
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: iob_add_queue_internal
- *
- * Description:
- * Add one I/O buffer chain to the end of a queue. May fail due to lack
- * of resources.
- *
- ****************************************************************************/
- static int iob_add_queue_internal(FAR struct iob_s *iob,
- FAR struct iob_queue_s *iobq,
- FAR struct iob_qentry_s *qentry)
- {
- /* Add the I/O buffer chain to the container */
- qentry->qe_head = iob;
- /* Add the container to the end of the queue */
- qentry->qe_flink = NULL;
- if (!iobq->qh_head)
- {
- iobq->qh_head = qentry;
- iobq->qh_tail = qentry;
- }
- else
- {
- DEBUGASSERT(iobq->qh_tail);
- iobq->qh_tail->qe_flink = qentry;
- iobq->qh_tail = qentry;
- }
- return 0;
- }
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: iob_add_queue
- *
- * Description:
- * Add one I/O buffer chain to the end of a queue. May fail due to lack
- * of resources.
- *
- ****************************************************************************/
- int iob_add_queue(FAR struct iob_s *iob, FAR struct iob_queue_s *iobq)
- {
- FAR struct iob_qentry_s *qentry;
- /* Allocate a container to hold the I/O buffer chain */
- qentry = iob_alloc_qentry();
- if (!qentry)
- {
- ioberr("ERROR: Failed to allocate a container\n");
- return -ENOMEM;
- }
- return iob_add_queue_internal(iob, iobq, qentry);
- }
- /****************************************************************************
- * Name: iob_tryadd_queue
- *
- * Description:
- * Add one I/O buffer chain to the end of a queue without waiting for
- * resources to become free.
- *
- ****************************************************************************/
- int iob_tryadd_queue(FAR struct iob_s *iob, FAR struct iob_queue_s *iobq)
- {
- FAR struct iob_qentry_s *qentry;
- /* Allocate a container to hold the I/O buffer chain */
- qentry = iob_tryalloc_qentry();
- if (!qentry)
- {
- ioberr("ERROR: Failed to allocate a container\n");
- return -ENOMEM;
- }
- return iob_add_queue_internal(iob, iobq, qentry);
- }
- #endif /* CONFIG_IOB_NCHAINS > 0 */
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