user extensions private data in TCB question

[Till Straumann]

Chris Johns wrote:

> Till Straumann wrote:
>
>> How does a user extension determine it's slot/pointer
>> in the TCB extension area -- is 'rtems_index(extension_id)'
>> the standard method?
>>
>
> Yes as far as I know. You need the extension's id to obtain the index.
>
>> If so:
>> How can an 'initial' user extension (i.e., one that was
>> created during rtems_initialize_executive_early())
>> determine the slot number it owns in the 'extensions'
>> array of the TCB?
>
>
> Could you be a little more specific ?

Besides being created (rtems_extension_create()),
extensions can also be added to the configuration table
(CONFIGURE_INITIAL_EXTENSIONS & friends). In this
case, I don't see how these extensions get an index and
name.

T.

>
> An extension should have a name and so you should be able to obtain 
> the id and therefore the index.
>
>>
>>  From scanning through the sources, it seems that
>> initial extensions don't even have a slot for private
>> data in the TCB -- is that true? [if so: bummer!].
>
>
> What source/extensions are you referring to ?
>
> Chris