diff options
| -rw-r--r-- | c-user/glossary.rst | 40 | ||||
| -rw-r--r-- | c-user/user-extensions/background.rst | 13 |
2 files changed, 42 insertions, 11 deletions
diff --git a/c-user/glossary.rst b/c-user/glossary.rst index 71a0242..16ddcef 100644 --- a/c-user/glossary.rst +++ b/c-user/glossary.rst @@ -233,6 +233,12 @@ Glossary A term used to describe memory which can be accessed at two different addresses. + dynamic extension sets + The dynamic extension sets are a list of :term:`user extensions`. The list + is defined by the system services used by the application and directive calls + such as :c:func:`rtems_extension_create`. See also + :term:`initial extension sets`. + EARS This term is an acronym for Easy Approach to Requirements Syntax. @@ -286,6 +292,26 @@ Glossary An object known by all nodes in a multiprocessor system. An object created with the GLOBAL attribute will be exported. + extension forward order + The :term:`user extensions` may be invoked in extension forward order. In + forward order, all user extensions of the :term:`initial extension sets` are + invoked before all user extensions of the :term:`dynamic extension sets`. + In the initial extension sets the order is defined by the table index. The + user extension with the lowest table index is invoked first. In the dynamic + extension sets the order is defined by the registration order. The first + registered user extension is invoked first. See also + :term:`extension reverse order`. + + extension reverse order + The :term:`user extensions` may be invoked in extension reverse order. In + reverse order, all user extensions of the :term:`dynamic extension sets` are + invoked before all user extensions of the :term:`initial extension sets`. + In the dynamic extension sets the order is defined by the registration order. + The last registered user extension is invoked first. In the initial + extension sets the order is defined by the table index. The user extension + with the highest table index is invoked first. See also + :term:`extension forward order`. + external address The address used to access dual-ported memory by all the nodes in a system which do not own the memory. @@ -371,6 +397,13 @@ Glossary An ineligible scheduler of a :term:`task` is a :term:`scheduler` which is not an :term:`eligible scheduler`. + initial extension sets + The initial extension sets are a table of :term:`user extensions`. The table + is defined by the application configuration for example through the + :ref:`CONFIGURE_INITIAL_EXTENSIONS` application configuration option. The + initial extension sets cannot be altered during runtime through directive + calls. See also :term:`dynamic extension sets`. + interface A specification of the methodology used to connect multiple independent subsystems. @@ -991,8 +1024,11 @@ Glossary A table which contains the entry points for each user extensions. user extensions - Software routines provided by the application to enhance the - functionality of RTEMS. + User extensions are software routines provided by the application to enhance + the functionality of RTEMS. An active user extension is either in the + :term:`initial extension sets` or the :term:`dynamic extension sets`. User + extensions are invoked in :term:`extension forward order` or + :term:`extension reverse order`. User Initialization Tasks Table A table which contains the information needed to create and start each of diff --git a/c-user/user-extensions/background.rst b/c-user/user-extensions/background.rst index 2dc2577..5aa747b 100644 --- a/c-user/user-extensions/background.rst +++ b/c-user/user-extensions/background.rst @@ -109,15 +109,10 @@ and release the extension buffers. Order of Invocation ------------------- -The user extensions are invoked in either `forward` or `reverse` order. In -forward order, the user extensions of initial extension sets are invoked before -the user extensions of the dynamic extension sets. The forward order of -initial extension sets is defined by the initial extension sets table index. -The forward order of dynamic extension sets is defined by the order in which -the dynamic extension sets were created. The reverse order is defined -accordingly. By invoking the user extensions in this order, extensions can be -built upon one another. At the following system events, the user extensions -are invoked in `forward` order +The user extensions are invoked in either :term:`extension forward order` or +:term:`extension reverse order`. By invoking the user extensions in these +orders, extensions can be built upon one another. At the following system +events, the user extensions are invoked in `forward` order - thread creation, |