160 lines
5.5 KiB
C
160 lines
5.5 KiB
C
/****************************************************************************
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* mm/iob/iob.h
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*
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* Copyright (C) 2014, 2017 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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#ifndef __MM_IOB_IOB_H
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#define __MM_IOB_IOB_H 1
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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 <semaphore.h>
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#include <debug.h>
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#include <nuttx/mm/iob.h>
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#ifdef CONFIG_MM_IOB
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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#if defined(CONFIG_DEBUG_FEATURES) && defined(CONFIG_IOB_DEBUG)
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#ifdef CONFIG_CPP_HAVE_VARARGS
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# define ioberr(format, ...) _err(format, ##__VA_ARGS__)
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# define iobwarn(format, ...) _warn(format, ##__VA_ARGS__)
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# define iobinfo(format, ...) _info(format, ##__VA_ARGS__)
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#else
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# define ioberr _err
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# define iobwarn _warn
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# define iobinfo _info
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#endif
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#else
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#ifdef CONFIG_CPP_HAVE_VARARGS
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# define ioberr(format, ...)
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# define iobwarn(format, ...)
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# define iobinfo(format, ...)
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#else
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# define ioberr (void)
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# define iobwarn (void)
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# define iobinfo (void)
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#endif
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#endif /* CONFIG_DEBUG_FEATURES && CONFIG_IOB_DEBUG */
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/* A list of all free, unallocated I/O buffers */
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extern FAR struct iob_s *g_iob_freelist;
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/* A list of I/O buffers that are committed for allocation */
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extern FAR struct iob_s *g_iob_committed;
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#if CONFIG_IOB_NCHAINS > 0
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/* A list of all free, unallocated I/O buffer queue containers */
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extern FAR struct iob_qentry_s *g_iob_freeqlist;
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/* A list of I/O buffer queue containers that are committed for allocation */
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extern FAR struct iob_qentry_s *g_iob_qcommitted;
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#endif
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/* Counting semaphores that tracks the number of free IOBs/qentries */
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extern sem_t g_iob_sem; /* Counts free I/O buffers */
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#if CONFIG_IOB_THROTTLE > 0
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extern sem_t g_throttle_sem; /* Counts available I/O buffers when throttled */
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#endif
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#if CONFIG_IOB_NCHAINS > 0
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extern sem_t g_qentry_sem; /* Counts free I/O buffer queue containers */
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#endif
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: iob_alloc_qentry
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*
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* Description:
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* Allocate an I/O buffer chain container by taking the buffer at the head
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* of the free list. This function is intended only for internal use by
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* the IOB module.
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*
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****************************************************************************/
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FAR struct iob_qentry_s *iob_alloc_qentry(void);
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/****************************************************************************
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* Name: iob_tryalloc_qentry
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*
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* Description:
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* Try to allocate an I/O buffer chain container by taking the buffer at
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* the head of the free list without waiting for the container to become
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* free. This function is intended only for internal use by the IOB module.
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*
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****************************************************************************/
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FAR struct iob_qentry_s *iob_tryalloc_qentry(void);
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/****************************************************************************
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* Name: iob_free_qentry
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*
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* Description:
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* Free the I/O buffer chain container by returning it to the free list.
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* The link to the next I/O buffer in the chain is return.
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*
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****************************************************************************/
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FAR struct iob_qentry_s *iob_free_qentry(FAR struct iob_qentry_s *iobq);
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#endif /* CONFIG_MM_IOB */
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#endif /* __MM_IOB_IOB_H */
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