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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.
 *
 *  $Id: regiondelete.c,v 1.2 2001-09-27 11:59:19 chris 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>
 
/*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;
 
  the_region = _Region_Get( id, &location );
  switch ( location ) {
    case OBJECTS_REMOTE:        /* this error cannot be returned */
      return RTEMS_INTERNAL_ERROR;
 
    case OBJECTS_ERROR:
      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 );
        _Thread_Enable_dispatch();
        return RTEMS_SUCCESSFUL;
      }
      _Thread_Enable_dispatch();
      return RTEMS_RESOURCE_IN_USE;
  }
 
  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
}