112 lines
2.7 KiB
C
112 lines
2.7 KiB
C
/****************************************************************************
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* mm/iob/iob_navail.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 <stdbool.h>
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#include <nuttx/mm/iob.h>
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#include "iob.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_navail
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*
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* Description:
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* Return the number of available IOBs.
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*
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****************************************************************************/
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int iob_navail(bool throttled)
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{
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int navail = 0;
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int ret;
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#if CONFIG_IOB_NBUFFERS > 0
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/* Get the value of the IOB counting semaphores */
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ret = nxsem_get_value(&g_iob_sem, &navail);
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if (ret >= 0)
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{
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ret = navail;
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#if CONFIG_IOB_THROTTLE > 0
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/* Subtract the throttle value is so requested */
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if (throttled)
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{
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ret -= CONFIG_IOB_THROTTLE;
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}
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#endif
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if (ret < 0)
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{
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ret = 0;
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}
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}
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#else
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ret = navail;
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#endif
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return ret;
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}
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/****************************************************************************
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* Name: iob_qentry_navail
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*
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* Description:
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* Return the number of available IOB chains.
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*
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****************************************************************************/
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int iob_qentry_navail(void)
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{
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int navail = 0;
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int ret;
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#if CONFIG_IOB_NCHAINS > 0
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/* Get the value of the IOB chain qentry counting semaphores */
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ret = nxsem_get_value(&g_qentry_sem, &navail);
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if (ret >= 0)
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{
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ret = navail;
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if (ret < 0)
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{
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ret = 0;
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}
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}
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#else
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ret = navail;
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#endif
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return ret;
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}
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