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/*

 *  Watchdog Handler

 *

 *

 *  COPYRIGHT (c) 1989-1999.

 *  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.OARcorp.com/rtems/license.html.

 *

 *  $Id: watchdogtickle.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/isr.h>

#include <rtems/score/watchdog.h>

/*PAGE

 *

 *  _Watchdog_Tickle

 *

 *  This routine decrements the delta counter in response to a tick.  The

 *  delta chain is updated accordingly.

 *

 *  Input parameters:

 *    header - pointer to the delta chain to be tickled

 *

 *  Output parameters: NONE

 */

void _Watchdog_Tickle(

  Chain_Control *header

)

{

  Watchdog_Control *the_watchdog;

  if ( _Chain_Is_empty( header ) )

    return;

  the_watchdog = _Watchdog_First( header );

  the_watchdog->delta_interval--;

  if ( the_watchdog->delta_interval != 0 )

    return;

  do {

     switch( _Watchdog_Remove( the_watchdog ) ) {

       case WATCHDOG_ACTIVE:

         (*the_watchdog->routine)(

           the_watchdog->id,

           the_watchdog->user_data

         );

         break;

       case WATCHDOG_INACTIVE:

         /*

          *  This state indicates that the watchdog is not on any chain.

          *  Thus, it is NOT on a chain being tickled.  This case should

          *  never occur.

          */

         break;

       case WATCHDOG_BEING_INSERTED:

         /*

          *  This state indicates that the watchdog is in the process of

          *  BEING inserted on the chain.  Thus, it can NOT be on a chain

          *  being tickled.  This case should never occur.

          */

         break;

       case WATCHDOG_REMOVE_IT:

         break;

     }

     the_watchdog = _Watchdog_First( header );

   } while ( !_Chain_Is_empty( header ) &&

             (the_watchdog->delta_interval == 0) );

}