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/*  Shm_Receive_packet

 *

 *  This routine is the shared memory locked queue MPCI driver routine

 *  used to obtain a packet containing a message from this node's

 *  receive queue.

 *

 *  Input parameters:

 *    packet         - address of a pointer to a packet

 *

 *  Output parameters:

 *    *(rpb->packet) - pointer to packet

 *                     NULL if no packet currently available

 *

 *  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.

 *

 *  receive.c,v 1.8 1999/11/30 19:57:59 joel Exp

 */

#include <rtems.h>

#include "shm_driver.h"

rtems_mpci_entry Shm_Receive_packet(

  rtems_packet_prefix **packet

)

{

  Shm_Envelope_control *ecb;

  ecb = Shm_Locked_queue_Get( Shm_Local_receive_queue );

  if ( ecb ) {

    *(packet) = Shm_Envelope_control_to_packet_prefix_pointer( ecb );

    if ( ecb->Preamble.endian != Shm_Configuration->format )

      Shm_Convert_packet( *packet );

    Shm_Receive_message_count++;

  } else {

    *(packet) = NULL;

    Shm_Null_message_count++;

  }

}