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/*  void Shm_Locked_queue_Add( lq_cb, ecb )

 *

 *  This routine adds an envelope control block to a shared memory queue.

 *

 *  Input parameters:

 *    lq_cb - pointer to a locked queue control block

 *    ecb   - pointer to an envelope control block

 *

 *  Output parameters: NONE

 *

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

 */

#include <rtems.h>

#include "shm_driver.h"

void Shm_Locked_queue_Add(

  Shm_Locked_queue_Control *lq_cb,

  Shm_Envelope_control     *ecb

)

{

  rtems_unsigned32 index;

  ecb->next  = Shm_Locked_queue_End_of_list;

  ecb->queue = lq_cb->owner;

  index      = ecb->index;

  Shm_Lock( lq_cb );

    if ( Shm_Convert(lq_cb->front) != Shm_Locked_queue_End_of_list )

      Shm_Envelopes[ Shm_Convert(lq_cb->rear) ].next = index;

    else

      lq_cb->front = index;

    lq_cb->rear  = index;

  Shm_Unlock( lq_cb );

}