Subversion Repositories openrisc_2011-10-31

/*

 *  ITRON 3.0 Mailbox 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: ref_mbx.c,v 1.2 2001-09-27 11:59:13 chris Exp $

 */

#include <itron.h>

#include <rtems/itron/mbox.h>

#include <rtems/itron/task.h>

/*

 *  ref_mbx - Reference Mailbox Status

 */

ER ref_mbx(

  T_RMBX *pk_rmbx,

  ID      mbxid

)

{

  register ITRON_Mailbox_Control *the_mailbox;

  Objects_Locations               location;

  Chain_Control                  *pending;

  if ( !pk_rmbx )

    return E_PAR;

  the_mailbox = _ITRON_Mailbox_Get( mbxid, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:

    case OBJECTS_ERROR:

      return _ITRON_Mailbox_Clarify_get_id_error( mbxid );

    case OBJECTS_LOCAL:

      pending = &the_mailbox->message_queue.Pending_messages;

      if ( _Chain_Is_empty( pending ) )

        pk_rmbx->pk_msg = NULL;

      else

        pk_rmbx->pk_msg = (T_MSG *) pending->first;

      /*

       *  Fill in whether or not there is a waiting task

       */

      if ( !_Thread_queue_First( &the_mailbox->message_queue.Wait_queue ) )

        pk_rmbx->wtsk = FALSE;

      else

        pk_rmbx->wtsk = TRUE;

      break;

  }

  _ITRON_return_errorno( E_OK );

}