fc127fd297
Squashed commit of the following:
mm/iob: The IOB available notifier is now just a wrapper around the common signal notifier.
sched/signal: Add a generic signal notification facility.
sched/signal/sig_evthread.c: More trivial naming changes.
sched/signal: Rename nxsig_notification() to nxsig_evthread() to make forthcoming naming additions more consistent.
161 lines
5.2 KiB
C
161 lines
5.2 KiB
C
/****************************************************************************
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* mm/iob/iob_initialize.c
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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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/****************************************************************************
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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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* Pre-processor Definitions
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****************************************************************************/
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#ifndef NULL
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# define NULL ((FAR void *)0)
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#endif
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/* This is a pool of pre-allocated I/O buffers */
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static struct iob_s g_iob_pool[CONFIG_IOB_NBUFFERS];
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#if CONFIG_IOB_NCHAINS > 0
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static struct iob_qentry_s g_iob_qpool[CONFIG_IOB_NCHAINS];
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#endif
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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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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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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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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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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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sem_t g_iob_sem; /* Counts free I/O buffers */
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#if CONFIG_IOB_THROTTLE > 0
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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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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 Functions
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****************************************************************************/
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/****************************************************************************
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* Name: iob_initialize
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*
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* Description:
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* Set up the I/O buffers for normal operations.
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*
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****************************************************************************/
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void iob_initialize(void)
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{
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static bool initialized = false;
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int i;
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/* Perform one-time initialization */
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if (!initialized)
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{
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/* Add each I/O buffer to the free list */
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for (i = 0; i < CONFIG_IOB_NBUFFERS; i++)
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{
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FAR struct iob_s *iob = &g_iob_pool[i];
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/* Add the pre-allocate I/O buffer to the head of the free list */
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iob->io_flink = g_iob_freelist;
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g_iob_freelist = iob;
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}
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g_iob_committed = NULL;
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nxsem_init(&g_iob_sem, 0, CONFIG_IOB_NBUFFERS);
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#if CONFIG_IOB_THROTTLE > 0
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nxsem_init(&g_throttle_sem, 0, CONFIG_IOB_NBUFFERS - CONFIG_IOB_THROTTLE);
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#endif
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#if CONFIG_IOB_NCHAINS > 0
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/* Add each I/O buffer chain queue container to the free list */
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for (i = 0; i < CONFIG_IOB_NCHAINS; i++)
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{
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FAR struct iob_qentry_s *iobq = &g_iob_qpool[i];
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/* Add the pre-allocate buffer container to the head of the free list */
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iobq->qe_flink = g_iob_freeqlist;
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g_iob_freeqlist = iobq;
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}
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g_iob_qcommitted = NULL;
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nxsem_init(&g_qentry_sem, 0, CONFIG_IOB_NCHAINS);
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#endif
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initialized = true;
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}
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}
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