path: root/cpukit/sapi/src/extension.c

/*
 *  Extension Manager
 *
 *
 *  COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
 *  On-Line Applications Research Corporation (OAR).
 *  All rights assigned to U.S. Government, 1994.
 *
 *  This material may be reproduced by or for the U.S. Government pursuant
 *  to the copyright license under the clause at DFARS 252.227-7013.  This
 *  notice must appear in all copies of this file and its derivatives.
 *
 *  $Id$
 */

#include <rtems/system.h>
#include <rtems/object.h>
#include <rtems/thread.h>
#include <rtems/extension.h>

/*PAGE
 *
 *  _Extension_Manager_initialization
 *
 *  This routine initializes all extension manager related data structures.
 *
 *  Input parameters:
 *    maximum_extensions - number of extensions to initialize
 *
 *  Output parameters:  NONE
 */

void _Extension_Manager_initialization(
  unsigned32 maximum_extensions
)
{
  _Objects_Initialize_information(
     &_Extension_Information,
     FALSE,
     maximum_extensions,
     sizeof( Extension_Control )
  );
}

/*PAGE
 *
 *  rtems_extension_create
 *
 *  This directive creates a extension and performs some initialization.
 *
 *  Input parameters:
 *    name            - extension name
 *    extension_table - pointer to extension set information
 *    id              - pointer to extension id
 *
 *  Output parameters:
 *    id                - extension id
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_extension_create(
  Objects_Name                   name,
  rtems_extensions_table *extension_table,
  Objects_Id                    *id
)
{
  Extension_Control *the_extension;

  if ( !_Objects_Is_name_valid( name ) )
    return ( RTEMS_INVALID_NAME );

  _Thread_Disable_dispatch();         /* to prevent deletion */

  the_extension = _Extension_Allocate();

  if ( !the_extension ) {
    _Thread_Enable_dispatch();
    return( RTEMS_TOO_MANY );
  }

  _User_extensions_Add_set( &the_extension->Extension, extension_table );

  _Objects_Open( &_Extension_Information, &the_extension->Object, name );

  *id = the_extension->Object.id;
  _Thread_Enable_dispatch();
  return( RTEMS_SUCCESSFUL );
}

/*PAGE
 *
 *  rtems_extension_ident
 *
 *  This directive returns the system ID associated with
 *  the extension name.
 *
 *  Input parameters:
 *    name - user defined message queue name
 *    id   - pointer to extension id
 *
 *  Output parameters:
 *    *id               - message queue id
 *    RTEMS_SUCCESSFUL - if successful
 *    error code        - if unsuccessful
 */

rtems_status_code rtems_extension_ident(
  Objects_Name  name,
  Objects_Id   *id
)
{
  return _Objects_Name_to_id(
    &_Extension_Information,
    name,
    RTEMS_SEARCH_LOCAL_NODE,
    id
  );
}

/*PAGE
 *
 *  rtems_extension_delete
 *
 *  This directive allows a thread to delete a extension.
 *
 *  Input parameters:
 *    id - extension id
 *
 *  Output parameters:
 *    RTEMS_SUCCESSFUL - if successful
 *    error code - if unsuccessful
 */

rtems_status_code rtems_extension_delete(
  Objects_Id id
)
{
  Extension_Control   *the_extension;
  Objects_Locations    location;

  the_extension = _Extension_Get( id, &location );
  switch ( location ) {
    case OBJECTS_ERROR:
    case OBJECTS_REMOTE:            /* should never return this */
      return( RTEMS_INVALID_ID );
    case OBJECTS_LOCAL:
      _User_extensions_Remove_set( &the_extension->Extension );
      _Objects_Close( &_Extension_Information, &the_extension->Object );
      _Extension_Free( the_extension );
      _Thread_Enable_dispatch();
      return( RTEMS_SUCCESSFUL );
  }

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