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/*  Shm_Get_packet

 *

 *  This routine is the shared memory locked queue MPCI driver

 *  routine used to obtain an empty message packet.

 *

 *  Input parameters:

 *    packet             - address of pointer to packet

 *

 *  Output parameters:

 *    *(cpb->get_packet) - address of allocated packet

 *

 *  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: getpkt.c,v 1.2 2001-09-27 12:01:12 chris Exp $

 */

#include <rtems.h>

#include "shm_driver.h"

rtems_mpci_entry Shm_Get_packet(

  rtems_packet_prefix **packet

)

{

  Shm_Envelope_control *ecb;

  ecb = Shm_Allocate_envelope();

  if ( !ecb )

    rtems_fatal_error_occurred ( SHM_NO_FREE_PKTS );

  *packet = Shm_Envelope_control_to_packet_prefix_pointer( ecb );

}