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/*

 *  ITRON Message Buffer 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_mbf.c,v 1.2 2001-09-27 11:59:13 chris Exp $

 */

#include <itron.h>

#include <rtems/itron/msgbuffer.h>

#include <rtems/itron/task.h>

/*

 *  ref_mbf - Reference Message Buffer Status

 */

ER ref_mbf(

  T_RMBF *pk_rmbf,

  ID      mbfid

)

{

  ITRON_Message_buffer_Control      *the_message_buffer;

  Objects_Locations                  location;

  CORE_message_queue_Control        *the_core_msgq;

  if ( !pk_rmbf )

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

  the_message_buffer = _ITRON_Message_buffer_Get( mbfid, &location );

  switch ( location ) {

  case OBJECTS_REMOTE:               /* Multiprocessing not supported */

  case OBJECTS_ERROR:

    return _ITRON_Message_buffer_Clarify_get_id_error( mbfid );

  case OBJECTS_LOCAL:

    the_core_msgq = &the_message_buffer->message_queue;

    /*

     *  Fill in the size of message to be sent

     */

    if (the_core_msgq->number_of_pending_messages == 0) {

      pk_rmbf->msgsz = 0;

    } else {

      pk_rmbf->msgsz = ((CORE_message_queue_Buffer_control *)

        the_core_msgq->Pending_messages.first)->Contents.size;

    }

    /*

     *  Fill in the size of free buffer

     */

    pk_rmbf->frbufsz =

      (the_core_msgq->maximum_pending_messages -

       the_core_msgq->number_of_pending_messages) *

       the_core_msgq->maximum_message_size;

    /*

     *  Fill in whether or not there is a waiting task

     */

    if ( !_Thread_queue_First(&the_core_msgq->Wait_queue ) )

       pk_rmbf->wtsk = FALSE;

    else

       pk_rmbf->wtsk =  TRUE;

    pk_rmbf->stsk = FALSE;

    _Thread_Enable_dispatch();

    return E_OK;

  }

  return E_OK;

}