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git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@3264 7fd9a85b-ad96-42d3-883c-3090e2eb8679
250 lines
7 KiB
C
250 lines
7 KiB
C
/************************************************************************
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* sched/mq_initialize.c
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*
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* Copyright (C) 2007, 2009, 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <stdint.h>
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#include <queue.h>
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#include <nuttx/kmalloc.h>
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#include "mq_internal.h"
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/************************************************************************
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* Definitions
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************************************************************************/
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/************************************************************************
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* Private Type Declarations
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************************************************************************/
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/* This is a container for a list of message queue
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* descriptors.
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*/
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struct mq_des_block_s
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{
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sq_entry_t queue;
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struct mq_des mqdes[NUM_MSG_DESCRIPTORS];
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};
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/************************************************************************
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* Global Variables
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************************************************************************/
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/* This is a list of all opened message queues */
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sq_queue_t g_msgqueues;
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/* The g_msgfree is a list of messages that are available
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* for general use. The number of messages in this list is a
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* system configuration item.
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*/
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sq_queue_t g_msgfree;
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/* The g_msgfreeInt is a list of messages that are reserved
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* for use by interrupt handlers.
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*/
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sq_queue_t g_msgfreeirq;
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/* The g_desfree data structure is a list of message
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* descriptors available to the operating system for general use.
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* The number of messages in the pool is a constant.
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*/
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sq_queue_t g_desfree;
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/************************************************************************
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* Private Variables
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************************************************************************/
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/* g_msgalloc is a pointer to the start of the allocated
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* block of messages.
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*/
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static mqmsg_t *g_msgalloc;
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/* g_msgfreeirqalloc is a pointer to the start of the
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* allocated block of messages.
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*/
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static mqmsg_t *g_msgfreeirqalloc;
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/* g_desalloc is a list of allocated block of message queue
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* descriptors.
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*/
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static sq_queue_t g_desalloc;
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/************************************************************************
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* Private Functions
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************************************************************************/
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/************************************************************************
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* Function: mq_msgblockalloc
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*
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* Description:
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* Allocate a block of messages and place them on the free
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* list.
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*
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*
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* Inputs:
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* queue
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************************************************************************/
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static mqmsg_t *mq_msgblockalloc(sq_queue_t *queue, uint16_t nmsgs,
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uint8_t alloc_type)
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{
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mqmsg_t *mqmsgblock;
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/* The g_msgfree must be loaded at initialization time to hold the
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* configured number of messages.
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*/
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mqmsgblock = (mqmsg_t*)kmalloc(sizeof(mqmsg_t) * nmsgs);
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if (mqmsgblock)
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{
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mqmsg_t *mqmsg = mqmsgblock;
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int i;
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for (i = 0; i < nmsgs; i++)
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{
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mqmsg->type = alloc_type;
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sq_addlast((FAR sq_entry_t*)mqmsg++, queue);
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}
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}
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return mqmsgblock;
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}
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/************************************************************************
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* Public Functions
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************************************************************************/
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/************************************************************************
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* Function: mq_initialize
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*
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* Description:
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* This function initializes the messasge system. This
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* function must be called early in the initialization
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* sequence before any of the other message interfaces
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* execute.
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*
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* Inputs:
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* None
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*
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* Return Value:
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* None
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*
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************************************************************************/
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void mq_initialize(void)
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{
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/* Initialize the list of message queues */
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sq_init(&g_msgqueues);
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/* Initialize the message free lists */
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sq_init(&g_msgfree);
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sq_init(&g_msgfreeirq);
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sq_init(&g_desalloc);
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/* Allocate a block of messages for general use */
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g_msgalloc =
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mq_msgblockalloc(&g_msgfree, CONFIG_PREALLOC_MQ_MSGS,
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MQ_ALLOC_FIXED);
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/* Allocate a block of messages for use exclusively by
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* interrupt handlers
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*/
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g_msgfreeirqalloc =
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mq_msgblockalloc(&g_msgfreeirq, NUM_INTERRUPT_MSGS,
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MQ_ALLOC_IRQ);
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/* Allocate a block of message queue descriptors */
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mq_desblockalloc();
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}
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/************************************************************************
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* Function: mq_desblockalloc
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*
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* Description:
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* Allocate a block of message descriptors and place them on the free
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* list.
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*
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* Inputs:
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* None
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*
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* Return Value:
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* None
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*
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************************************************************************/
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void mq_desblockalloc(void)
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{
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struct mq_des_block_s *mqdesblock;
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/* Allocate a block of message descriptors */
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mqdesblock = (struct mq_des_block_s *)kmalloc(sizeof(struct mq_des_block_s));
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if (mqdesblock)
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{
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int i;
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/* Add the block to the list of allocated blocks (in case
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* we ever need to reclaim the memory.
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*/
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sq_addlast((FAR sq_entry_t*)&mqdesblock->queue, &g_desalloc);
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/* Then add each message queue descriptor to the free list */
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for (i = 0; i < NUM_MSG_DESCRIPTORS; i++)
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{
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sq_addlast((FAR sq_entry_t*)&mqdesblock->mqdes[i], &g_desfree);
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}
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}
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}
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