region.inl

来自「RTEMS (Real-Time Executive for Multiproc」· INL 代码 · 共 127 行

/*  region.inl
 *
 *  This file contains the macro implementation of the inlined
 *  routines from the 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: region.inl,v 1.9.2.1 2003/09/04 18:47:17 joel Exp $
 */

#ifndef __REGION_inl
#define __REGION_inl

/*PAGE
 *
 *  _Region_Allocate
 *
 *  DESCRIPTION:
 *
 *  This function allocates a region control block from
 *  the inactive chain of free region control blocks.
 */

RTEMS_INLINE_ROUTINE Region_Control *_Region_Allocate( void )
{
  return (Region_Control *) _Objects_Allocate( &_Region_Information );
}

/*PAGE
 *
 *  _Region_Free
 *
 *  DESCRIPTION:
 *
 *  This routine frees a region control block to the
 *  inactive chain of free region control blocks.
 */

RTEMS_INLINE_ROUTINE void _Region_Free (
  Region_Control *the_region
)
{
  _Objects_Free( &_Region_Information, &the_region->Object );
}

/*PAGE
 *
 *  _Region_Get
 *
 *  DESCRIPTION:
 *
 *  This function maps region IDs to region control blocks.
 *  If ID corresponds to a local region, then it returns
 *  the_region control pointer which maps to ID and location
 *  is set to OBJECTS_LOCAL.  Otherwise, location is set
 *  to OBJECTS_ERROR and the_region is undefined.
 */

RTEMS_INLINE_ROUTINE Region_Control *_Region_Get (
  Objects_Id         id,
  Objects_Locations *location
)
{
  return (Region_Control *)
    _Objects_Get_no_protection( &_Region_Information, id, location );
}

/*PAGE
 *
 *  _Region_Allocate_segment
 *
 *  DESCRIPTION:
 *
 *  This function attempts to allocate a segment from the_region.
 *  If successful, it returns the address of the allocated segment.
 *  Otherwise, it returns NULL.
 */

RTEMS_INLINE_ROUTINE void *_Region_Allocate_segment (
  Region_Control *the_region,
  unsigned32      size
)
{
   return _Heap_Allocate( &the_region->Memory, size );
}

/*PAGE
 *
 *  _Region_Free_segment
 *
 *  DESCRIPTION:
 *
 *  This function frees the_segment to the_region.
 */

RTEMS_INLINE_ROUTINE boolean _Region_Free_segment (
  Region_Control *the_region,
  void           *the_segment
)
{
  return _Heap_Free( &the_region->Memory, the_segment );
}

/*PAGE
 *
 *  _Region_Is_null
 *
 *  DESCRIPTION:
 *
 *  This function returns TRUE if the_region is NULL and FALSE otherwise.
 */

RTEMS_INLINE_ROUTINE boolean _Region_Is_null (
  Region_Control *the_region
)
{
  return ( the_region == NULL  );
}

#endif
/* end of include file */