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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.
*
* $Id$
*/
#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) );
}
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