Subversion Repositories openrisc_2011-10-31

/*

 *  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: trcv_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>

/*

 *  trcv_mbf - Receive Message from MessageBuffer with Timeout

 */

ER trcv_mbf(

  VP   msg,

  INT *p_msgsz,

  ID   mbfid,

  TMO  tmout

)

{

  ITRON_Message_buffer_Control   *the_message_buffer;

  Objects_Locations               location;

  CORE_message_queue_Status       status;

  boolean                         wait;

  Watchdog_Interval               interval;

  interval = 0;

  if (tmout == TMO_POL) {

    wait = FALSE;

  } else {

    wait = TRUE;

    if (tmout != TMO_FEVR)

      interval = TOD_MILLISECONDS_TO_TICKS(tmout);

  }

  if (wait && _ITRON_Is_in_non_task_state() )

    return E_CTX;

  if (!p_msgsz || !msg || tmout <= -2)

    return E_PAR;

  the_message_buffer = _ITRON_Message_buffer_Get(mbfid, &location);

  switch (location) {

    case OBJECTS_REMOTE:

    case OBJECTS_ERROR:           /* Multiprocessing not supported */

      return _ITRON_Message_buffer_Clarify_get_id_error(mbfid);

    case OBJECTS_LOCAL:

      _CORE_message_queue_Seize(

          &the_message_buffer->message_queue,

          the_message_buffer->Object.id,

          msg,

          p_msgsz,

          wait,

          interval

      );

      _Thread_Enable_dispatch();

      status = (CORE_message_queue_Status)_Thread_Executing->Wait.return_code;

      return

        _ITRON_Message_buffer_Translate_core_message_buffer_return_code(status);

    }

    /*

     *  If multiprocessing were supported, this is where we would announce

     *  the existence of the semaphore to the rest of the system.

     */

#if defined(RTEMS_MULTIPROCESSING)

#endif

    return E_OK;

}