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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: watchdogremove.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_Remove

 *

 *  The routine removes a watchdog from a delta chain and updates

 *  the delta counters of the remaining watchdogs.

 */

Watchdog_States _Watchdog_Remove(

  Watchdog_Control *the_watchdog

)

{

  ISR_Level         level;

  Watchdog_States   previous_state;

  Watchdog_Control *next_watchdog;

  _ISR_Disable( level );

  previous_state = the_watchdog->state;

  switch ( previous_state ) {

    case WATCHDOG_INACTIVE:

      break;

    case WATCHDOG_BEING_INSERTED:

      /*

       *  It is not actually on the chain so just change the state and

       *  the Insert operation we interrupted will be aborted.

       */

      the_watchdog->state = WATCHDOG_INACTIVE;

      break;

    case WATCHDOG_ACTIVE:

    case WATCHDOG_REMOVE_IT:

      the_watchdog->state = WATCHDOG_INACTIVE;

      next_watchdog = _Watchdog_Next( the_watchdog );

      if ( _Watchdog_Next(next_watchdog) )

        next_watchdog->delta_interval += the_watchdog->delta_interval;

      if ( _Watchdog_Sync_count )

        _Watchdog_Sync_level = _ISR_Nest_level;

      _Chain_Extract_unprotected( &the_watchdog->Node );

      break;

  }

  the_watchdog->stop_time = _Watchdog_Ticks_since_boot;

  _ISR_Enable( level );

  return( previous_state );

}