93 lines
2.7 KiB
C
93 lines
2.7 KiB
C
/****************************************************************************
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* mm/iob/iob_free_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 <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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_free_queue
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*
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* Description:
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* Free an entire queue of I/O buffer chains.
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*
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****************************************************************************/
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void iob_free_queue(FAR struct iob_queue_s *qhead,
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enum iob_user_e producerid)
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{
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FAR struct iob_qentry_s *iobq;
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FAR struct iob_qentry_s *nextq;
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FAR struct iob_s *iob;
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/* Detach the list from the queue head so first for safety (should be safe
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* anyway).
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*/
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iobq = qhead->qh_head;
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qhead->qh_head = NULL;
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/* Remove each I/O buffer chain from the queue */
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while (iobq)
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{
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/* Remove the I/O buffer chain from the head of the queue and
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* discard the queue container.
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*/
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iob = iobq->qe_head;
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DEBUGASSERT(iob);
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/* Remove the queue container from the list and discard it */
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nextq = iobq->qe_flink;
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iob_free_qentry(iobq);
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iobq = nextq;
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/* Free the I/O chain */
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iob_free_chain(iob, producerid);
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}
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}
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#endif /* CONFIG_IOB_NCHAINS > 0 */
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