138 lines
4.1 KiB
C
138 lines
4.1 KiB
C
/****************************************************************************
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* mm/iob/iob_add_queue.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/mm/iob.h>
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#include "iob.h"
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#if CONFIG_IOB_NCHAINS > 0
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#ifndef NULL
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# define NULL ((FAR void *)0)
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#endif
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_add_queue_internal
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*
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* Description:
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* Add one I/O buffer chain to the end of a queue. May fail due to lack
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* of resources.
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*
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****************************************************************************/
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static int iob_add_queue_internal(FAR struct iob_s *iob,
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FAR struct iob_queue_s *iobq,
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FAR struct iob_qentry_s *qentry)
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{
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/* Add the I/O buffer chain to the container */
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qentry->qe_head = iob;
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/* Add the container to the end of the queue */
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qentry->qe_flink = NULL;
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if (!iobq->qh_head)
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{
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iobq->qh_head = qentry;
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iobq->qh_tail = qentry;
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}
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else
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{
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DEBUGASSERT(iobq->qh_tail);
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iobq->qh_tail->qe_flink = qentry;
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iobq->qh_tail = qentry;
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}
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return 0;
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_add_queue
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*
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* Description:
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* Add one I/O buffer chain to the end of a queue. May fail due to lack
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* of resources.
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*
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****************************************************************************/
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int iob_add_queue(FAR struct iob_s *iob, FAR struct iob_queue_s *iobq)
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{
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FAR struct iob_qentry_s *qentry;
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/* Allocate a container to hold the I/O buffer chain */
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qentry = iob_alloc_qentry();
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if (!qentry)
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{
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ioberr("ERROR: Failed to allocate a container\n");
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return -ENOMEM;
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}
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return iob_add_queue_internal(iob, iobq, qentry);
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}
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/****************************************************************************
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* Name: iob_tryadd_queue
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*
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* Description:
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* Add one I/O buffer chain to the end of a queue without waiting for
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* resources to become free.
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*
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****************************************************************************/
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int iob_tryadd_queue(FAR struct iob_s *iob, FAR struct iob_queue_s *iobq)
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{
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FAR struct iob_qentry_s *qentry;
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/* Allocate a container to hold the I/O buffer chain */
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qentry = iob_tryalloc_qentry();
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if (!qentry)
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{
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ioberr("ERROR: Failed to allocate a container\n");
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return -ENOMEM;
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}
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return iob_add_queue_internal(iob, iobq, qentry);
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}
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#endif /* CONFIG_IOB_NCHAINS > 0 */
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