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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: objectgetnext.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_Get_next

 *

 * Like _Objects_Get, but considers the 'id' as a "hint" and

 * finds next valid one after that point.

 * Mostly used for monitor and debug traversal of an object.

 *

 * Input parameters:

 *   information - pointer to entry in table for this class

 *   id          - object id to search for

 *   location    - address of where to store the location

 *   next_id     - address to store next id to try

 *

 * Output parameters:

 *   returns     - address of object if local

 *   location    - one of the following:

 *                  OBJECTS_ERROR  - invalid object ID

 *                  OBJECTS_REMOTE - remote object

 *                  OBJECTS_LOCAL  - local object

 *   next_id     - will contain a reasonable "next" id to continue traversal

 *

 * NOTE:

 *      assumes can add '1' to an id to get to next index.

 */

Objects_Control *

_Objects_Get_next(

    Objects_Information *information,

    Objects_Id           id,

    Objects_Locations   *location_p,

    Objects_Id          *next_id_p

)

{

    Objects_Control *object;

    Objects_Id       next_id;

    if (_Objects_Get_index(id) == OBJECTS_ID_INITIAL_INDEX)

        next_id = information->minimum_id;

    else

        next_id = id;

    do {

        /* walked off end of list? */

        if (_Objects_Get_index(next_id) > information->maximum)

        {

            *location_p = OBJECTS_ERROR;

            goto final;

        }

        /* try to grab one */

        object = _Objects_Get(information, next_id, location_p);

        next_id++;

    } while (*location_p != OBJECTS_LOCAL);

    *next_id_p = next_id;

    return object;

final:

    *next_id_p = OBJECTS_ID_FINAL;

    return 0;

}