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/*

 *  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.

 *

 *  ref_sem.c,v 1.3 2001/01/24 14:15:04 joel Exp

 */

#if HAVE_CONFIG_H

#include "config.h"

#endif

#include <itron.h>

#include <rtems/itron/semaphore.h>

#include <rtems/itron/task.h>

#include <rtems/score/tod.h>

/*

 *  ref_sem - Reference Semaphore Status

 *

 *  This function implements the ITRON 3.0 ref_sem() service.

 */

ER ref_sem(

  ID      semid,

  T_RSEM *pk_rsem

)

{

  ITRON_Semaphore_Control *the_semaphore;

  Objects_Locations        location;

  if ( !pk_rsem )

    return E_PAR;   /* XXX check this error code */

  the_semaphore = _ITRON_Semaphore_Get( semid, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:               /* Multiprocessing not supported */

    case OBJECTS_ERROR:

      return _ITRON_Semaphore_Clarify_get_id_error( semid );

    case OBJECTS_LOCAL:

      /*

       *  Fill in the current semaphore count

       */

      pk_rsem->semcnt = _CORE_semaphore_Get_count( &the_semaphore->semaphore );

      /*

       *  Fill in whether or not there is a waiting task

       */

      if ( !_Thread_queue_First( &the_semaphore->semaphore.Wait_queue ) )

        pk_rsem->wtsk = FALSE;

      else

        pk_rsem->wtsk = TRUE;

      _Thread_Enable_dispatch();

      return E_OK;

  }

  return E_OK;

}