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135 lines
4.6 KiB
135 lines
4.6 KiB
/************************************************************************ |
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* sched/wd_initialize.c |
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* |
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* Copyright (C) 2007, 2009 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 <queue.h> |
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#include <nuttx/kmalloc.h> |
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#include "os_internal.h" |
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#include "wd_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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/************************************************************************ |
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* Global Variables |
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************************************************************************/ |
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/* The g_wdfreelist data structure is a singly linked list of watchdogs |
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* available to the system for delayed function use. |
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*/ |
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sq_queue_t g_wdfreelist; |
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/* g_wdpool is a pointer to a list of pre-allocated watchdogs. The number |
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* of watchdogs in the pool is a configuration item. |
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*/ |
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FAR wdog_t *g_wdpool; |
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/* The g_wdactivelist data structure is a singly linked list ordered by |
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* watchdog expiration time. When watchdog timers expire,the functions on |
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* this linked list are removed and the function is called. |
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*/ |
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sq_queue_t g_wdactivelist; |
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/************************************************************************ |
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* Private Variables |
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************************************************************************/ |
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/************************************************************************ |
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* Private Functions |
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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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* Name: wd_initialize |
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* |
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* Description: |
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* This function initalized the watchdog data structures |
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* |
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* Parameters: |
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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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* Assumptions: |
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* This function must be called early in the initialization sequence |
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* before the timer interrupt is attached and before any watchdog |
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* services are used. |
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* |
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************************************************************************/ |
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void wd_initialize(void) |
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{ |
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/* Initialize the free watchdog list */ |
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sq_init(&g_wdfreelist); |
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/* The g_wdfreelist must be loaded at initialization time to hold the |
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* configured number of watchdogs. |
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*/ |
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g_wdpool = (FAR wdog_t*)kmalloc(sizeof(wdog_t) * CONFIG_PREALLOC_WDOGS); |
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if (g_wdpool) |
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{ |
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FAR wdog_t *wdog = g_wdpool; |
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int i; |
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for (i = 0; i < CONFIG_PREALLOC_WDOGS; i++) |
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{ |
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sq_addlast((FAR sq_entry_t*)wdog++, &g_wdfreelist); |
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} |
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} |
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/* The g_wdactivelist queue must be reset at initialization time. */ |
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sq_init(&g_wdactivelist); |
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}
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