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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.rtems.com/license/LICENSE.
*
* $Id$
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#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_resize_segment
*
* This directive will try to resize segment to the new size 'size'
* "in place".
*
* Input parameters:
* id - region id
* segment - pointer to segment address
* size - new required size
*
* Output parameters:
* RTEMS_SUCCESSFUL - if successful
* error code - if unsuccessful
*/
rtems_status_code rtems_region_resize_segment(
Objects_Id id,
void *segment,
size_t size,
size_t *old_size
)
{
register Region_Control *the_region;
Objects_Locations location;
Heap_Resize_status status;
uint32_t avail_size;
uint32_t osize;
if ( !old_size )
return RTEMS_INVALID_ADDRESS;
_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, 7 );
status = _Heap_Resize_block(
&the_region->Memory,
segment,
(uint32_t) size,
&osize,
&avail_size
);
*old_size = (uint32_t) osize;
_Region_Debug_Walk( the_region, 8 );
if( status == HEAP_RESIZE_SUCCESSFUL && avail_size > 0 )
_Region_Process_queue( the_region ); /* unlocks allocator internally */
else
_RTEMS_Unlock_allocator();
return
(status == HEAP_RESIZE_SUCCESSFUL) ? RTEMS_SUCCESSFUL :
(status == HEAP_RESIZE_UNSATISFIED) ? RTEMS_UNSATISFIED :
RTEMS_INVALID_ADDRESS;
}
return RTEMS_INTERNAL_ERROR; /* unreached - only to remove warnings */
}
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