taskwakewhen.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 *  RTEMS Task Manager
 *
 *
 *  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.
 *
 *  $Id: taskwakewhen.c,v 1.2.6.2 2004/05/06 19:20:04 joel Exp $
 */

#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/rtems/modes.h>
#include <rtems/score/object.h>
#include <rtems/score/stack.h>
#include <rtems/score/states.h>
#include <rtems/rtems/tasks.h>
#include <rtems/score/thread.h>
#include <rtems/score/threadq.h>
#include <rtems/score/tod.h>
#include <rtems/score/userext.h>
#include <rtems/score/wkspace.h>
#include <rtems/score/apiext.h>
#include <rtems/score/sysstate.h>

/*PAGE
 *
 *  rtems_task_wake_when
 *
 *  This directive blocks the requesting thread until the given date and
 *  time is reached.
 *
 *  Input parameters:
 *    time_buffer - pointer to the time and date structure
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code       - if unsuccessful
 */

rtems_status_code rtems_task_wake_when(
  rtems_time_of_day *time_buffer
)
{
  Watchdog_Interval   seconds;

  if ( !_TOD_Is_set )
    return RTEMS_NOT_DEFINED;

  if ( !time_buffer )
    return RTEMS_INVALID_ADDRESS;

  time_buffer->ticks = 0;

  if ( !_TOD_Validate( time_buffer ) )
    return RTEMS_INVALID_CLOCK;

  seconds = _TOD_To_seconds( time_buffer );

  if ( seconds <= _TOD_Seconds_since_epoch )
    return RTEMS_INVALID_CLOCK;

  _Thread_Disable_dispatch();
    _Thread_Set_state( _Thread_Executing, STATES_WAITING_FOR_TIME );
    _Watchdog_Initialize(
      &_Thread_Executing->Timer,
      _Thread_Delay_ended,
      _Thread_Executing->Object.id,
      NULL
    );
    _Watchdog_Insert_seconds(
      &_Thread_Executing->Timer,
      seconds - _TOD_Seconds_since_epoch
    );
  _Thread_Enable_dispatch();
  return RTEMS_SUCCESSFUL;
}