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/**
* @file
*
* @ingroup ScoreWatchdog
* @brief Watchdog Tickle
*/
/*
* 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.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/score/watchdogimpl.h>
void _Watchdog_Tickle(
Watchdog_Header *header
)
{
ISR_lock_Context lock_context;
_Watchdog_Acquire( header, &lock_context );
if ( !_Watchdog_Is_empty( header ) ) {
Watchdog_Control *first;
Watchdog_Interval delta;
first = _Watchdog_First( header );
delta = first->delta_interval;
/*
* Although it is forbidden to insert watchdogs with a delta interval of
* zero it is possible to observe watchdogs with a delta interval of zero
* at this point. For example lets have a watchdog chain of one watchdog
* with a delta interval of one and insert a new one with an initial value
* of one. At the start of the insert procedure it will advance one step
* and reduce its delta interval by one yielding zero. Now a tick happens.
* This will remove the watchdog on the chain and update the insert
* iterator. Now the insert operation continues and will insert the new
* watchdog with a delta interval of zero.
*/
if ( delta > 0 ) {
--delta;
first->delta_interval = delta;
}
while ( delta == 0 ) {
bool run;
Watchdog_Service_routine_entry routine;
Objects_Id id;
void *user_data;
run = ( first->state == WATCHDOG_ACTIVE );
_Watchdog_Remove_it( header, first );
routine = first->routine;
id = first->id;
user_data = first->user_data;
_Watchdog_Release( header, &lock_context );
if ( run ) {
(*routine)( id, user_data );
}
_Watchdog_Acquire( header, &lock_context );
if ( _Watchdog_Is_empty( header ) ) {
break;
}
first = _Watchdog_First( header );
delta = first->delta_interval;
}
}
_Watchdog_Release( header, &lock_context );
}
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