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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.

 *

 *  regionreturnsegment.c,v 1.4 2002/07/01 22:32:31 joel Exp

 */

#ifdef RTEMS_REGION_SHRED_ON_FREE

#include <string.h>

#ifndef RTEMS_REGION_FREE_SHRED_PATTERN

#define RTEMS_REGION_FREE_SHRED_PATTERN 0x00

#endif

#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_return_segment

 *

 *  This directive will return a segment to its region.

 *

 *  Input parameters:

 *    id      - region id

 *    segment - pointer to segment address

 *

 *  Output parameters:

 *    RTEMS_SUCCESSFUL - if successful

 *    error code        - if unsuccessful

 */

rtems_status_code rtems_region_return_segment(

  Objects_Id  id,

  void       *segment

)

{

  register Region_Control *the_region;

  Thread_Control          *the_thread;

  Objects_Locations        location;

  void                   **the_segment;

#ifdef RTEMS_REGION_FREE_SHRED_PATTERN

  unsigned32               size;

#endif

  int                      status;

  _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, 3 );

#ifdef RTEMS_REGION_FREE_SHRED_PATTERN

      if ( _Heap_Size_of_user_area( &the_region->Memory, segment, size ) ) {

        memset(segment, (RTEMS_REGION_FREE_SHRED_PATTERN & 0xFF), size);

      } else {

        _RTEMS_Unlock_allocator();

        return RTEMS_INVALID_ADDRESS;

      }

#endif

      status = _Region_Free_segment( the_region, segment );

      _Region_Debug_Walk( the_region, 4 );

      if ( !status ) {

        _RTEMS_Unlock_allocator();

        return RTEMS_INVALID_ADDRESS;

      }

      the_region->number_of_used_blocks -= 1;

      for ( ; ; ) {

        the_thread = _Thread_queue_First( &the_region->Wait_queue );

        if ( the_thread == NULL )

           break;

        the_segment = (void **) _Region_Allocate_segment(

           the_region,

           the_thread->Wait.count

        );

        if ( the_segment == NULL )

           break;

        *(void **)the_thread->Wait.return_argument = the_segment;

        the_region->number_of_used_blocks += 1;

        _Thread_queue_Extract( &the_region->Wait_queue, the_thread );

        the_thread->Wait.return_code = RTEMS_SUCCESSFUL;

      }

      _RTEMS_Unlock_allocator();

      return RTEMS_SUCCESSFUL;

  }

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

}