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c-user: Clarify rtems_extension_create()

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Sebastian Huber
2021-09-14 08:15:25 +02:00
parent 023f60936c
commit 0bc62eee95
1 changed files with 7 additions and 3 deletions
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10
c-user/user-extensions/directives.rst
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@@ -102,11 +102,15 @@ The extension set is initialized using the extension table specified in
.. rubric:: NOTES:
The user-provided extension set table is not used after the return of the
The user-provided extension table is not used after the return of the
directive.
Newly created extension sets are immediately installed and are invoked upon the
next system event supporting an extension.
Each extension of the extension table is optional and may be `NULL
<https://en.cppreference.com/w/c/types/NULL>`_. All extensions except the task
switch extension of the extension table are atomically and immediately
installed. A task switch extension is separately installed after the other
extensions. The extensions of the extension table are invoked upon the next
system event supporting an extension.
An alternative to dynamically created extension sets are initial extensions,
see :ref:`CONFIGURE_INITIAL_EXTENSIONS`. Initial extensions are recommended