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/*

 *  Region Manager

 *

 *

 *  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.

 *

 *  regiondelete.c,v 1.3 2002/07/01 22:32:31 joel Exp

 */

#include <rtems/system.h>

#include <rtems/rtems/status.h>

#include <rtems/rtems/support.h>

#include <rtems/score/object.h>

#include <rtems/rtems/options.h>

#include <rtems/rtems/region.h>

#include <rtems/score/states.h>

#include <rtems/score/thread.h>

#include <rtems/score/apimutex.h>

/*PAGE

 *

 *  rtems_region_delete

 *

 *  This directive allows a thread to delete a region specified by

 *  the region identifier, provided that none of its segments are

 *  still allocated.

 *

 *  Input parameters:

 *    id - region id

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - if successful

 *    error code - if unsuccessful

 */

rtems_status_code rtems_region_delete(

  Objects_Id id

)

{

  register Region_Control *the_region;

  Objects_Locations               location;

  _RTEMS_Lock_allocator();

  the_region = _Region_Get( id, &location );

  switch ( location ) {

    case OBJECTS_REMOTE:        /* this error cannot be returned */

      _RTEMS_Unlock_allocator();

      return RTEMS_INTERNAL_ERROR;

    case OBJECTS_ERROR:

      _RTEMS_Unlock_allocator();

      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:

      _Region_Debug_Walk( the_region, 5 );

      if ( the_region->number_of_used_blocks == 0 ) {

        _Objects_Close( &_Region_Information, &the_region->Object );

        _Region_Free( the_region );

        _RTEMS_Unlock_allocator();

        return RTEMS_SUCCESSFUL;

      }

      _RTEMS_Unlock_allocator();

      return RTEMS_RESOURCE_IN_USE;

  }

  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */

}