partreturnbuffer.c

RTEMS (Real-Time Executive for Multiprocessor Systems) is a free open source real-time operating sys

/*
 *  Partition 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: partreturnbuffer.c,v 1.2.6.1 2003/09/04 18:47:17 joel Exp $
 */

#include <rtems/system.h>
#include <rtems/rtems/status.h>
#include <rtems/rtems/support.h>
#include <rtems/score/address.h>
#include <rtems/score/object.h>
#include <rtems/rtems/part.h>
#include <rtems/score/thread.h>
#include <rtems/score/sysstate.h>

/*PAGE
 *
 *  rtems_partition_return_buffer
 *
 *  This directive will return the given buffer to the specified
 *  buffer partition.
 *
 *  Input parameters:
 *    id     - partition id
 *    buffer - pointer to buffer address
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code - if unsuccessful
 */

rtems_status_code rtems_partition_return_buffer(
  Objects_Id  id,
  void       *buffer
)
{
  register Partition_Control *the_partition;
  Objects_Locations           location;

  the_partition = _Partition_Get( id, &location );
  switch ( location ) {

    case OBJECTS_REMOTE:
#if defined(RTEMS_MULTIPROCESSING)
      return _Partition_MP_Send_request_packet(
          PARTITION_MP_RETURN_BUFFER_REQUEST,
          id,
          buffer
        );
#endif

    case OBJECTS_ERROR:
      return RTEMS_INVALID_ID;

    case OBJECTS_LOCAL:
      if ( _Partition_Is_buffer_valid( buffer, the_partition ) ) {
        _Partition_Free_buffer( the_partition, buffer );
        the_partition->number_of_used_blocks -= 1;
        _Thread_Enable_dispatch();
        return RTEMS_SUCCESSFUL;
      }
      _Thread_Enable_dispatch();
      return RTEMS_INVALID_ADDRESS;
  }

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