127 lines
3.6 KiB
C
127 lines
3.6 KiB
C
/****************************************************************************
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* mm/iob/iob_navail.c
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*
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* Copyright (C) 2018 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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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/semaphore.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 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_getvalue(&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_getvalue(&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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