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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [exec/] [sapi/] [src/] [extension.c] - Blame information for rev 30

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1 30 unneback 
/*
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 *  Extension Manager
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 *
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 *
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 *  COPYRIGHT (c) 1989-1999.
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 *  On-Line Applications Research Corporation (OAR).
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 *
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 *  The license and distribution terms for this file may be
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 *  found in the file LICENSE in this distribution or at
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 *  http://www.OARcorp.com/rtems/license.html.
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 *
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 *  $Id: extension.c,v 1.2 2001-09-27 11:59:20 chris Exp $
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 */
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#include <rtems/system.h>
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#include <rtems/rtems/support.h>
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#include <rtems/score/object.h>
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#include <rtems/score/thread.h>
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#include <rtems/extension.h>
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/*PAGE
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 *
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 *  _Extension_Manager_initialization
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 *
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 *  This routine initializes all extension manager related data structures.
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 *
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 *  Input parameters:
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 *    maximum_extensions - number of extensions to initialize
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 *
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 *  Output parameters:  NONE
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 */
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void _Extension_Manager_initialization(
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  unsigned32 maximum_extensions
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)
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{
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  _Objects_Initialize_information(
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    &_Extension_Information,
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    OBJECTS_RTEMS_EXTENSIONS,
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    FALSE,
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    maximum_extensions,
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    sizeof( Extension_Control ),
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    FALSE,
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    RTEMS_MAXIMUM_NAME_LENGTH,
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    FALSE
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  );
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}
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/*PAGE
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 *
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 *  rtems_extension_create
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 *
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 *  This directive creates a extension and performs some initialization.
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 *
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 *  Input parameters:
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 *    name            - extension name
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 *    extension_table - pointer to extension set information
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 *    id              - pointer to extension id
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 *
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 *  Output parameters:
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 *    id                - extension id
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 *    RTEMS_SUCCESSFUL - if successful
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 *    error code        - if unsuccessful
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 */
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rtems_status_code rtems_extension_create(
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  rtems_name              name,
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  rtems_extensions_table *extension_table,
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  Objects_Id             *id
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)
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{
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  Extension_Control *the_extension;
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  if ( !rtems_is_name_valid( name ) )
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    return RTEMS_INVALID_NAME;
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  _Thread_Disable_dispatch();         /* to prevent deletion */
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  the_extension = _Extension_Allocate();
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  if ( !the_extension ) {
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    _Thread_Enable_dispatch();
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    return RTEMS_TOO_MANY;
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  }
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  _User_extensions_Add_set( &the_extension->Extension, extension_table );
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  _Objects_Open( &_Extension_Information, &the_extension->Object, &name );
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  *id = the_extension->Object.id;
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  _Thread_Enable_dispatch();
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  return RTEMS_SUCCESSFUL;
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}
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/*PAGE
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 *
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 *  rtems_extension_ident
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 *
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 *  This directive returns the system ID associated with
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 *  the extension name.
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 *
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 *  Input parameters:
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 *    name - user defined message queue name
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 *    id   - pointer to extension id
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 *
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 *  Output parameters:
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 *    *id               - message queue id
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 *    RTEMS_SUCCESSFUL - if successful
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 *    error code        - if unsuccessful
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 */
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rtems_status_code rtems_extension_ident(
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  rtems_name    name,
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  Objects_Id   *id
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)
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{
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  Objects_Name_to_id_errors  status;
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  status = _Objects_Name_to_id(
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    &_Extension_Information,
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    &name,
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    OBJECTS_SEARCH_LOCAL_NODE,
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    id
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  );
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  return _Status_Object_name_errors_to_status[ status ];
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}
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/*PAGE
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 *
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 *  rtems_extension_delete
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 *
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 *  This directive allows a thread to delete a extension.
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 *
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 *  Input parameters:
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 *    id - extension id
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 *
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 *  Output parameters:
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 *    RTEMS_SUCCESSFUL - if successful
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 *    error code - if unsuccessful
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 */
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rtems_status_code rtems_extension_delete(
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  Objects_Id id
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)
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{
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  Extension_Control   *the_extension;
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  Objects_Locations    location;
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  the_extension = _Extension_Get( id, &location );
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  switch ( location ) {
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    case OBJECTS_ERROR:
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    case OBJECTS_REMOTE:            /* should never return this */
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      return RTEMS_INVALID_ID;
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    case OBJECTS_LOCAL:
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      _User_extensions_Remove_set( &the_extension->Extension );
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      _Objects_Close( &_Extension_Information, &the_extension->Object );
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      _Extension_Free( the_extension );
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      _Thread_Enable_dispatch();
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      return RTEMS_SUCCESSFUL;
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  }
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  return RTEMS_INTERNAL_ERROR;   /* unreached - only to remove warnings */
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}

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