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/*

 *  Object Handler

 *

 *

 *  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: objectallocatebyindex.c,v 1.2 2001-09-27 11:59:34 chris Exp $

 */

#include <rtems/system.h>

#include <rtems/score/address.h>

#include <rtems/score/chain.h>

#include <rtems/score/object.h>

#if defined(RTEMS_MULTIPROCESSING)

#include <rtems/score/objectmp.h>

#endif

#include <rtems/score/thread.h>

#include <rtems/score/wkspace.h>

#include <rtems/score/sysstate.h>

#include <rtems/score/isr.h>

/*PAGE

 *

 *  _Objects_Allocate_by_index

 *

 *  DESCRIPTION:

 *

 *  This function allocates the object control block

 *  specified by the index from the inactive chain of

 *  free object control blocks.

 */

Objects_Control *_Objects_Allocate_by_index(

  Objects_Information *information,

  unsigned32           index,

  unsigned32           sizeof_control

)

{

  Objects_Control *the_object;

  if ( index && information->maximum >= index ) {

    the_object = _Objects_Get_local_object( information, index );

    if ( the_object )

      return NULL;

    /* XXX

     *  This whole section of code needs to be addressed.

     *    +  The 0 should be dealt with more properly so we can autoextend.

     *    +  The pointer arithmetic is probably too expensive.

     *    +  etc.

     */

    the_object = (Objects_Control *) _Addresses_Add_offset(

      information->object_blocks[ 0 ],

      (sizeof_control * (index - 1))

    );

    _Chain_Extract( &the_object->Node );

    return the_object;

  }

  /*

   *  Autoextend will have to be thought out as it applies

   *  to user assigned indices.

   */

  return NULL;

}