113 lines
4.4 KiB
C
113 lines
4.4 KiB
C
/****************************************************************************
|
|
* net/iob/iob.h
|
|
*
|
|
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
|
|
* Author: Gregory Nutt <gnutt@nuttx.org>
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in
|
|
* the documentation and/or other materials provided with the
|
|
* distribution.
|
|
* 3. Neither the name NuttX nor the names of its contributors may be
|
|
* used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
|
|
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
|
|
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
|
|
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
|
|
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
|
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
|
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifndef __NET_IOB_IOB_H
|
|
#define __NET_IOB_IOB_H 1
|
|
|
|
/****************************************************************************
|
|
* Included Files
|
|
****************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <semaphore.h>
|
|
|
|
#include <nuttx/net/iob.h>
|
|
|
|
/****************************************************************************
|
|
* Pre-processor Definitions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Private Types
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/* A list of all free, unallocated I/O buffers */
|
|
|
|
extern FAR struct iob_s *g_iob_freelist;
|
|
|
|
/* A list of all free, unallocated I/O buffer queue containers */
|
|
|
|
#if CONFIG_IOB_NCHAINS > 0
|
|
extern FAR struct iob_qentry_s *g_iob_freeqlist;
|
|
#endif
|
|
|
|
/* Counting semaphores that tracks the number of free IOBs/qentries */
|
|
|
|
extern sem_t g_iob_sem; /* Counts free I/O buffers */
|
|
#if CONFIG_IOB_THROTTLE > 0
|
|
extern sem_t g_throttle_sem; /* Counts available I/O buffers when throttled */
|
|
#endif
|
|
#if CONFIG_IOB_NCHAINS > 0
|
|
extern sem_t g_qentry_sem; /* Counts free I/O buffer queue containers */
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Public Data
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Public Function Prototypes
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: iob_alloc_qentry
|
|
*
|
|
* Description:
|
|
* Allocate an I/O buffer chain container by taking the buffer at the head
|
|
* of the free list. This function is intended only for internal use by
|
|
* the IOB module.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct iob_qentry_s *iob_alloc_qentry(void);
|
|
|
|
/****************************************************************************
|
|
* Name: iob_free_qentry
|
|
*
|
|
* Description:
|
|
* Free the I/O buffer chain container by returning it to the free list.
|
|
* The link to the next I/O buffer in the chain is return.
|
|
*
|
|
****************************************************************************/
|
|
|
|
FAR struct iob_qentry_s *iob_free_qentry(FAR struct iob_qentry_s *iobq);
|
|
|
|
#endif /* __NET_IOB_IOB_H */
|