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/*

 *  Clock 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.OARcorp.com/rtems/license.html.

 *

 *  $Id: clocktick.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/rtems/clock.h>

#include <rtems/score/isr.h>

#include <rtems/score/thread.h>

#include <rtems/score/tod.h>

#include <rtems/score/watchdog.h>

/*PAGE

 *

 *  rtems_clock_tick

 *

 *  This directive notifies the executve that a tick has occurred.

 *  When the tick occurs the time manager updates and maintains

 *  the calendar time, timeslicing, and any timeout delays.

 *

 *  Input parameters:  NONE

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - always succeeds

 *

 *  NOTE: This routine only works for leap-years through 2099.

 */

rtems_status_code rtems_clock_tick( void )

{

  _TOD_Tickle_ticks();

  _Watchdog_Tickle_ticks();

  _Thread_Tickle_timeslice();

  if ( _Thread_Is_context_switch_necessary() &&

       _Thread_Is_dispatching_enabled() )

    _Thread_Dispatch();

  return RTEMS_SUCCESSFUL;

}