watchdog.h

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/*
 *  COPYRIGHT (c) 1989-2007.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.com/license/LICENSE.
 *
 *  $Id: watchdog.h,v 1.26 2008/05/31 05:31:18 ralf Exp $
 */

#ifndef _RTEMS_SCORE_WATCHDOG_H
#define _RTEMS_SCORE_WATCHDOG_H

#include <rtems/score/object.h>

#ifdef __cplusplus
extern "C" {
#endif

#define WATCHDOG_MAXIMUM_INTERVAL ((Watchdog_Interval) 0xffffffff)

typedef uint32_t   Watchdog_Interval;

typedef uint32_t (*Watchdog_Nanoseconds_since_last_tick_routine)(void);

typedef void Watchdog_Service_routine;

typedef Watchdog_Service_routine ( *Watchdog_Service_routine_entry )(
                 Objects_Id,
                 void *
             );

#define WATCHDOG_NO_TIMEOUT  0

typedef enum {
  WATCHDOG_INACTIVE,
  WATCHDOG_BEING_INSERTED,
  WATCHDOG_ACTIVE,
  WATCHDOG_REMOVE_IT
} Watchdog_States;

typedef enum {
  WATCHDOG_FORWARD,
  WATCHDOG_BACKWARD
} Watchdog_Adjust_directions;

typedef struct {
  Chain_Node                      Node;
  Watchdog_States                 state;
  Watchdog_Interval               initial;
  Watchdog_Interval               delta_interval;
  Watchdog_Interval               start_time;
  Watchdog_Interval               stop_time;
  Watchdog_Service_routine_entry  routine;
  Objects_Id                      id;
  void                           *user_data;
}   Watchdog_Control;

SCORE_EXTERN volatile uint32_t    _Watchdog_Sync_level;

SCORE_EXTERN volatile uint32_t    _Watchdog_Sync_count;

SCORE_EXTERN volatile Watchdog_Interval _Watchdog_Ticks_since_boot;

SCORE_EXTERN Watchdog_Nanoseconds_since_last_tick_routine
    _Watchdog_Nanoseconds_since_tick_handler;

SCORE_EXTERN Chain_Control _Watchdog_Ticks_chain;

SCORE_EXTERN Chain_Control _Watchdog_Seconds_chain;

void _Watchdog_Handler_initialization( void );

Watchdog_States _Watchdog_Remove (
  Watchdog_Control *the_watchdog
);

void _Watchdog_Adjust (
  Chain_Control              *header,
  Watchdog_Adjust_directions  direction,
  Watchdog_Interval           units
);

void _Watchdog_Insert (
  Chain_Control         *header,
  Watchdog_Control      *the_watchdog
);

void _Watchdog_Tickle (
  Chain_Control *header
);

#ifndef __RTEMS_APPLICATION__
#include <rtems/score/watchdog.inl>
#endif

#ifdef __cplusplus
}
#endif

#endif
/* end of include file */

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