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| -rw-r--r-- | c-user/user-extensions/directives.rst | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/c-user/user-extensions/directives.rst b/c-user/user-extensions/directives.rst index 2dbac54..ac04cdd 100644 --- a/c-user/user-extensions/directives.rst +++ b/c-user/user-extensions/directives.rst @@ -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 |