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/*

 *  Message Queue 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: msgqreceive.c,v 1.2 2001-09-27 11:59:19 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/sysstate.h>

#include <rtems/score/chain.h>

#include <rtems/score/isr.h>

#include <rtems/score/coremsg.h>

#include <rtems/score/object.h>

#include <rtems/score/states.h>

#include <rtems/score/thread.h>

#include <rtems/score/wkspace.h>

#if defined(RTEMS_MULTIPROCESSING)

#include <rtems/score/mpci.h>

#endif

#include <rtems/rtems/status.h>

#include <rtems/rtems/attr.h>

#include <rtems/rtems/message.h>

#include <rtems/rtems/options.h>

#include <rtems/rtems/support.h>

/*PAGE

 *

 *  rtems_message_queue_receive

 *

 *  This directive dequeues a message from the designated message queue

 *  and copies it into the requesting thread's buffer.

 *

 *  Input parameters:

 *    id         - queue id

 *    buffer     - pointer to message buffer

 *    size       - size of message receive

 *    option_set - options on receive

 *    timeout    - number of ticks to wait

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - if successful

 *    error code       - if unsuccessful

 */

rtems_status_code rtems_message_queue_receive(

  Objects_Id            id,

  void                 *buffer,

  unsigned32           *size,

  unsigned32            option_set,

  rtems_interval        timeout

)

{

  register Message_queue_Control *the_message_queue;

  Objects_Locations               location;

  boolean                         wait;

  the_message_queue = _Message_queue_Get( id, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:

#if defined(RTEMS_MULTIPROCESSING)

      return _Message_queue_MP_Send_request_packet(

          MESSAGE_QUEUE_MP_RECEIVE_REQUEST,

          id,

          buffer,

          size,

          option_set,

          timeout

        );

#endif

    case OBJECTS_ERROR:

      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:

      if ( _Options_Is_no_wait( option_set ) )

        wait = FALSE;

      else

        wait = TRUE;

      _CORE_message_queue_Seize(

        &the_message_queue->message_queue,

        the_message_queue->Object.id,

        buffer,

        size,

        wait,

        timeout

      );

      _Thread_Enable_dispatch();

      return _Message_queue_Translate_core_message_queue_return_code(

        _Thread_Executing->Wait.return_code

      );

  }

  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */

}