nuttx/sched/mqueue/mq_initialize.c

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/****************************************************************************
* sched/mqueue/mq_initialize.c
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <nuttx/kmalloc.h>
#include "mqueue/mqueue.h"
/****************************************************************************
* Public Data
****************************************************************************/
/* The g_msgfree is a list of messages that are available for general
* use. The number of messages in this list is a system configuration
* item.
*/
struct list_node g_msgfree = LIST_INITIAL_VALUE(g_msgfree);
/* The g_msgfreeInt is a list of messages that are reserved for use by
* interrupt handlers.
*/
struct list_node g_msgfreeirq = LIST_INITIAL_VALUE(g_msgfreeirq);
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: mq_msgblockalloc
*
* Description:
* Allocate a block of messages and place them on the free list.
*
* Input Parameters:
* queue
*
****************************************************************************/
static void
mq_msgblockalloc(FAR struct list_node *list, uint16_t nmsgs,
uint8_t alloc_type)
{
FAR struct mqueue_msg_s *mqmsgblock;
/* The list must be loaded at initialization time to hold the
* configured number of messages.
*/
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mqmsgblock = (FAR struct mqueue_msg_s *)
kmm_malloc(sizeof(struct mqueue_msg_s) * nmsgs);
if (mqmsgblock)
{
int i;
for (i = 0; i < nmsgs; i++)
{
mqmsgblock->type = alloc_type;
list_add_tail(list, &mqmsgblock->node);
mqmsgblock++;
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxmq_initialize
*
* Description:
* This function initializes the message system. This function must
* be called early in the initialization sequence before any of the
* other message interfaces execute.
*
* Input Parameters:
* None
*
* Returned Value:
* None
*
****************************************************************************/
void nxmq_initialize(void)
{
/* Allocate a block of messages for general use */
mq_msgblockalloc(&g_msgfree, CONFIG_PREALLOC_MQ_MSGS,
MQ_ALLOC_FIXED);
/* Allocate a block of messages for use exclusively by
* interrupt handlers
*/
mq_msgblockalloc(&g_msgfreeirq, CONFIG_PREALLOC_MQ_IRQ_MSGS,
MQ_ALLOC_IRQ);
}