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/*

 *  Timer Manager - rtems_timer_fire_when directive

 *

 *

 *  COPYRIGHT (c) 1989-2002.

 *  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.

 *

 *  timerfirewhen.c,v 1.3 2002/01/16 22:09:50 joel Exp

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/rtems/support.h>

#include <rtems/score/object.h>

#include <rtems/score/thread.h>

#include <rtems/rtems/timer.h>

#include <rtems/score/tod.h>

#include <rtems/score/watchdog.h>

/*PAGE

 *

 *  rtems_timer_fire_when

 *

 *  This directive allows a thread to start a timer.

 *

 *  Input parameters:

 *    id        - timer id

 *    wall_time - time of day to fire timer

 *    routine   - routine to schedule

 *    user_data - passed as argument to routine when it is fired

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - if successful

 *    error code       - if unsuccessful

 */

rtems_status_code rtems_timer_fire_when(

  Objects_Id                          id,

  rtems_time_of_day                  *wall_time,

  rtems_timer_service_routine_entry   routine,

  void                               *user_data

)

{

  Timer_Control       *the_timer;

  Objects_Locations    location;

  rtems_interval       seconds;

  if ( !_TOD_Is_set )

    return RTEMS_NOT_DEFINED;

  if ( !_TOD_Validate( wall_time ) )

    return RTEMS_INVALID_CLOCK;

  seconds = _TOD_To_seconds( wall_time );

  if ( seconds <= _TOD_Seconds_since_epoch )

    return RTEMS_INVALID_CLOCK;

  the_timer = _Timer_Get( id, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:            /* should never return this */

      return RTEMS_INTERNAL_ERROR;

    case OBJECTS_ERROR:

      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:

      (void) _Watchdog_Remove( &the_timer->Ticker );

      the_timer->the_class = TIMER_TIME_OF_DAY;

      _Watchdog_Initialize( &the_timer->Ticker, routine, id, user_data );

      _Watchdog_Insert_seconds(

         &the_timer->Ticker,

         seconds - _TOD_Seconds_since_epoch

       );

      _Thread_Enable_dispatch();

      return RTEMS_SUCCESSFUL;

  }

  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */

}