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Diffstat (limited to 'nuttx/sched/wd_initialize.c')
-rw-r--r-- | nuttx/sched/wd_initialize.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/nuttx/sched/wd_initialize.c b/nuttx/sched/wd_initialize.c new file mode 100644 index 000000000..db7aba502 --- /dev/null +++ b/nuttx/sched/wd_initialize.c @@ -0,0 +1,135 @@ +/************************************************************************ + * 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); +} |