ba9486de4a
since it is impossible to track producer and consumer correctly if TCP/IP stack pass IOB directly to netdev Signed-off-by: Xiang Xiao <xiaoxiang@xiaomi.com>
86 lines
2.8 KiB
C
86 lines
2.8 KiB
C
/****************************************************************************
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* mm/iob/iob_trimhead_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 <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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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_trimhead_queue
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*
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* Description:
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* Remove bytes from the beginning of an I/O chain at the head of the
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* queue. Emptied I/O buffers are freed and, hence, the head of the
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* queue may change.
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*
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* This function is just a wrapper around iob_trimhead() that assures that
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* the I/O buffer chain at the head of queue is modified with the trimming
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* operation.
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*
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* Returned Value:
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* The new I/O buffer chain at the head of the queue is returned.
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*
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****************************************************************************/
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FAR struct iob_s *iob_trimhead_queue(FAR struct iob_queue_s *qhead,
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unsigned int trimlen)
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{
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FAR struct iob_qentry_s *qentry;
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FAR struct iob_s *iob = NULL;
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/* Peek at the I/O buffer chain container at the head of the queue */
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qentry = qhead->qh_head;
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if (qentry)
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{
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/* Verify that the queue entry contains an I/O buffer chain */
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iob = qentry->qe_head;
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if (iob)
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{
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/* Trim the I/Buffer chain and update the queue head */
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iob = iob_trimhead(iob, trimlen);
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qentry->qe_head = iob;
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}
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}
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/* Return the new I/O buffer chain at the head of the queue */
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return iob;
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}
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#endif /* CONFIG_IOB_NCHAINS > 0 */
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