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/************************************************************************
* sched/d_internal.h
*
* 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.
*
************************************************************************/
#ifndef __SCHED_WD_INTERNAL_H
#define __SCHED_WD_INTERNAL_H
/************************************************************************
* Included Files
************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdbool.h>
#include <wdog.h>
#include <nuttx/compiler.h>
/************************************************************************
* Pre-processor Definitions
************************************************************************/
/************************************************************************
* Public Type Declarations
************************************************************************/
/* This is the watchdog structure. The WDOG_ID is a pointer to a
* watchdog structure.
*/
struct wdog_s
{
FAR struct wdog_s *next; /* Support for singly linked lists. */
wdentry_t func; /* Function to execute when delay expires */
#ifdef CONFIG_PIC
FAR void *picbase; /* PIC base address */
#endif
int lag; /* Timer associated with the delay */
bool active; /* true if the watchdog is actively timing */
uint8_t argc; /* The number of parameters to pass */
uint32_t parm[CONFIG_MAX_WDOGPARMS];
};
typedef struct wdog_s wdog_t;
/************************************************************************
* Public Variables
************************************************************************/
#ifdef __cplusplus
#define EXTERN extern "C"
extern "C"
{
#else
#define EXTERN extern
#endif
/* The g_wdfreelist data structure is a singly linked list of watchdogs
* available to the system for delayed function use.
*/
extern 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.
*/
extern 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.
*/
extern sq_queue_t g_wdactivelist;
/************************************************************************
* Public Function Prototypes
************************************************************************/
/************************************************************************
* Name: wd_initialize
*
* Description:
* This function initializes 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 weak_function wd_initialize(void);
/****************************************************************************
* Name: wd_timer
*
* Description:
* This function is called from the timer interrupt handler to determine
* if it is time to execute a watchdog function. If so, the watchdog
* function will be executed in the context of the timer interrupt
* handler.
*
* Parameters:
* ticks - If CONFIG_SCHED_TICKLESS is defined then the number of ticks
* in the the interval that just expired is provided. Otherwise,
* this function is called on each timer interrupt and a value of one
* is implicit.
*
* Return Value:
* If CONFIG_SCHED_TICKLESS is defined then the number of ticks for the
* next delay is provided (zero if no delay). Otherwise, this function
* has no returned value.
*
* Assumptions:
* Called from interrupt handler logic with interrupts disabled.
*
****************************************************************************/
#ifdef CONFIG_SCHED_TICKLESS
unsigned int wd_timer(int ticks);
#else
void wd_timer(void);
#endif
#undef EXTERN
#ifdef __cplusplus
}
#endif
#endif /* __SCHED_WD_INTERNAL_H */
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