622455d762
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4940 42af7a65-404d-4744-a932-0658087f49c3
136 lines
4.6 KiB
C
136 lines
4.6 KiB
C
/************************************************************************
|
|
* sched/wd_initialize.c
|
|
*
|
|
* Copyright (C) 2007, 2009 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.
|
|
*
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Included Files
|
|
************************************************************************/
|
|
|
|
#include <nuttx/config.h>
|
|
|
|
#include <queue.h>
|
|
#include <nuttx/kmalloc.h>
|
|
|
|
#include "os_internal.h"
|
|
#include "wd_internal.h"
|
|
|
|
/************************************************************************
|
|
* Definitions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Private Type Declarations
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Global Variables
|
|
************************************************************************/
|
|
|
|
/* The g_wdfreelist data structure is a singly linked list of watchdogs
|
|
* available to the system for delayed function use.
|
|
*/
|
|
|
|
sq_queue_t g_wdfreelist;
|
|
|
|
/* g_wdpool is a pointer to a list of pre-allocated watchdogs. The number
|
|
* of watchdogs in the pool is a configuration item.
|
|
*/
|
|
|
|
FAR wdog_t *g_wdpool;
|
|
|
|
/* The g_wdactivelist data structure is a singly linked list ordered by
|
|
* watchdog expiration time. When watchdog timers expire,the functions on
|
|
* this linked list are removed and the function is called.
|
|
*/
|
|
|
|
sq_queue_t g_wdactivelist;
|
|
|
|
/************************************************************************
|
|
* Private Variables
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Private Functions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Public Functions
|
|
************************************************************************/
|
|
|
|
/************************************************************************
|
|
* Name: wd_initialize
|
|
*
|
|
* Description:
|
|
* This function initalized the watchdog data structures
|
|
*
|
|
* Parameters:
|
|
* None
|
|
*
|
|
* Return Value:
|
|
* None
|
|
*
|
|
* Assumptions:
|
|
* This function must be called early in the initialization sequence
|
|
* before the timer interrupt is attached and before any watchdog
|
|
* services are used.
|
|
*
|
|
************************************************************************/
|
|
|
|
void wd_initialize(void)
|
|
{
|
|
/* Initialize the free watchdog list */
|
|
|
|
sq_init(&g_wdfreelist);
|
|
|
|
/* The g_wdfreelist must be loaded at initialization time to hold the
|
|
* configured number of watchdogs.
|
|
*/
|
|
|
|
g_wdpool = (FAR wdog_t*)kmalloc(sizeof(wdog_t) * CONFIG_PREALLOC_WDOGS);
|
|
if (g_wdpool)
|
|
{
|
|
FAR wdog_t *wdog = g_wdpool;
|
|
int i;
|
|
|
|
for (i = 0; i < CONFIG_PREALLOC_WDOGS; i++)
|
|
{
|
|
sq_addlast((FAR sq_entry_t*)wdog++, &g_wdfreelist);
|
|
}
|
|
}
|
|
|
|
/* The g_wdactivelist queue must be reset at initialization time. */
|
|
|
|
sq_init(&g_wdactivelist);
|
|
}
|