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/**
* @file
*
* @brief Watchdog Adjust
* @ingroup ScoreWatchdog
*/
/*
* 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.com/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <rtems/system.h>
#include <rtems/score/isr.h>
#include <rtems/score/watchdogimpl.h>
void _Watchdog_Adjust(
Chain_Control *header,
Watchdog_Adjust_directions direction,
Watchdog_Interval units
)
{
ISR_Level level;
_ISR_Disable( level );
/*
* NOTE: It is safe NOT to make 'header' a pointer
* to volatile data (contrast this with watchdoginsert.c)
* because we call _Watchdog_Tickle() below and
* hence the compiler must not assume *header to remain
* unmodified across that call.
*
* Till Straumann, 7/2003
*/
if ( !_Chain_Is_empty( header ) ) {
switch ( direction ) {
case WATCHDOG_BACKWARD:
_Watchdog_First( header )->delta_interval += units;
break;
case WATCHDOG_FORWARD:
while ( units ) {
if ( units < _Watchdog_First( header )->delta_interval ) {
_Watchdog_First( header )->delta_interval -= units;
break;
} else {
units -= _Watchdog_First( header )->delta_interval;
_Watchdog_First( header )->delta_interval = 1;
_ISR_Enable( level );
_Watchdog_Tickle( header );
_ISR_Disable( level );
if ( _Chain_Is_empty( header ) )
break;
}
}
break;
}
}
_ISR_Enable( level );
}
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