source: rtems/cpukit/rtems/src/rtemstimer.c @ 98e4ebf5

/*
 *  Timer Manager
 *
 *
 *  COPYRIGHT (c) 1989-1997.
 *  On-Line Applications Research Corporation (OAR).
 *  Copyright assigned to U.S. Government, 1994.
 *
 *  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/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
 *
 *  _Timer_Manager_initialization
 *
 *  This routine initializes all timer manager related data structures.
 *
 *  Input parameters:
 *    maximum_timers - number of timers to initialize
 *
 *  Output parameters:  NONE
 */

void _Timer_Manager_initialization(
  unsigned32 maximum_timers
)
{
  _Objects_Initialize_information(
    &_Timer_Information,
    OBJECTS_RTEMS_TIMERS,
    FALSE,
    maximum_timers,
    sizeof( Timer_Control ),
    FALSE,
    RTEMS_MAXIMUM_NAME_LENGTH,
    FALSE
  );
}

/*PAGE
 *
 *  rtems_timer_create
 *
 *  This directive creates a timer and performs some initialization.
 *
 *  Input parameters:
 *    name - timer name
 *    id   - pointer to timer id
 *
 *  Output parameters:
 *    id                - timer id
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_timer_create(
  rtems_name    name,
  Objects_Id   *id
)
{
  Timer_Control *the_timer;

  if ( !rtems_is_name_valid( name ) )
    return RTEMS_INVALID_NAME;

  _Thread_Disable_dispatch();         /* to prevent deletion */

  the_timer = _Timer_Allocate();

  if ( !the_timer ) {
    _Thread_Enable_dispatch();
    return RTEMS_TOO_MANY;
  }

  the_timer->the_class = TIMER_DORMANT;

  _Objects_Open( &_Timer_Information, &the_timer->Object, &name );

  *id = the_timer->Object.id;
  _Thread_Enable_dispatch();
  return RTEMS_SUCCESSFUL;
}

/*PAGE
 *
 *  rtems_timer_ident
 *
 *  This directive returns the system ID associated with
 *  the timer name.
 *
 *  Input parameters:
 *    name - user defined message queue name
 *    id   - pointer to timer id
 *
 *  Output parameters:
 *    *id               - message queue id
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_timer_ident(
  rtems_name    name,
  Objects_Id   *id
)
{
  Objects_Name_to_id_errors  status;

  status = _Objects_Name_to_id(
    &_Timer_Information,
    &name,
    OBJECTS_SEARCH_LOCAL_NODE,
    id
  );

  return _Status_Object_name_errors_to_status[ status ];
}

/*PAGE
 *
 *  rtems_timer_cancel
 *
 *  This directive allows a thread to cancel a timer.
 *
 *  Input parameters:
 *    id - timer id
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code - if unsuccessful
 */

rtems_status_code rtems_timer_cancel(
  Objects_Id id
)
{
  Timer_Control   *the_timer;
  Objects_Locations       location;

  the_timer = _Timer_Get( id, &location );
  switch ( location ) {
    case OBJECTS_ERROR:
      return RTEMS_INVALID_ID;
    case OBJECTS_REMOTE:            /* should never return this */
      return RTEMS_INTERNAL_ERROR;
    case OBJECTS_LOCAL:
      if ( !_Timer_Is_dormant_class( the_timer->the_class ) ) 
        (void) _Watchdog_Remove( &the_timer->Ticker );
      _Thread_Enable_dispatch();
      return RTEMS_SUCCESSFUL;
  }

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

/*PAGE
 *
 *  rtems_timer_delete
 *
 *  This directive allows a thread to delete a timer.
 *
 *  Input parameters:
 *    id - timer id
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code - if unsuccessful
 */

rtems_status_code rtems_timer_delete(
  Objects_Id id
)
{
  Timer_Control   *the_timer;
  Objects_Locations       location;

  the_timer = _Timer_Get( id, &location );
  switch ( location ) {
    case OBJECTS_ERROR:
      return RTEMS_INVALID_ID;
    case OBJECTS_REMOTE:            /* should never return this */
      return RTEMS_INTERNAL_ERROR;
    case OBJECTS_LOCAL:
      _Objects_Close( &_Timer_Information, &the_timer->Object );
      (void) _Watchdog_Remove( &the_timer->Ticker );
      _Timer_Free( the_timer );
      _Thread_Enable_dispatch();
      return RTEMS_SUCCESSFUL;
  }

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

/*PAGE
 *
 *  rtems_timer_fire_after
 *
 *  This directive allows a thread to start a timer.
 *
 *  Input parameters:
 *    id      - timer id
 *    ticks   - interval until routine is fired
 *    routine - routine to schedule
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_timer_fire_after(
  Objects_Id                         id,
  rtems_interval                     ticks,
  rtems_timer_service_routine_entry  routine,
  void                              *user_data
)
{
  Timer_Control      *the_timer;
  Objects_Locations   location;

  if ( ticks == 0 )
    return RTEMS_INVALID_NUMBER;

  the_timer = _Timer_Get( id, &location );
  switch ( location ) {
    case OBJECTS_ERROR:
      return RTEMS_INVALID_ID;
    case OBJECTS_REMOTE:            /* should never return this */
      return RTEMS_INTERNAL_ERROR;
    case OBJECTS_LOCAL:
      (void) _Watchdog_Remove( &the_timer->Ticker );
      the_timer->the_class = TIMER_INTERVAL;
      _Watchdog_Initialize( &the_timer->Ticker, routine, id, user_data );
      _Watchdog_Insert_ticks( &the_timer->Ticker, ticks );
      _Thread_Enable_dispatch();
      return RTEMS_SUCCESSFUL;
  }

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

/*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
 *
 *  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_ERROR:
      return RTEMS_INVALID_ID;
    case OBJECTS_REMOTE:            /* should never return this */
      return RTEMS_INTERNAL_ERROR;
    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 */
}

/*PAGE
 *
 *  rtems_timer_reset
 *
 *  This directive allows a thread to reset a timer.
 *
 *  Input parameters:
 *    id - timer id
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_timer_reset(
  Objects_Id id
)
{
  Timer_Control     *the_timer;
  Objects_Locations  location;

  the_timer = _Timer_Get( id, &location );
  switch ( location ) {
    case OBJECTS_ERROR:
      return RTEMS_INVALID_ID;
    case OBJECTS_REMOTE:            /* should never return this */
      return RTEMS_INTERNAL_ERROR;
    case OBJECTS_LOCAL:
      if ( _Timer_Is_interval_class( the_timer->the_class ) ) {
        _Watchdog_Reset( &the_timer->Ticker );
        _Thread_Enable_dispatch();
        return RTEMS_SUCCESSFUL;
      }
      _Thread_Enable_dispatch();
      return RTEMS_NOT_DEFINED;
  }

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