--- c-user/glossary.rst | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+)
diff --git a/c-user/glossary.rst b/c-user/glossary.rst index 86350a8..1d95f26 100644 --- a/c-user/glossary.rst +++ b/c-user/glossary.rst @@ -1,5 +1,6 @@ .. SPDX-License-Identifier: CC-BY-SA-4.0 +.. Copyright (C) 2020 Richi Dubey (richidu...@gmail.com) .. Copyright (C) 2017, 2019 embedded brains GmbH (http://www.embedded-brains.de) .. Copyright (C) 1988, 1998 On-Line Applications Research Corporation (OAR) @@ -16,6 +17,13 @@ Glossary A term used to describe an object which has been created by an application. + APA + This term is an acronym for Arbitrary Processor Affinity. + In this model, a thread is allowed to have an arbitrary affinity to + the processor set, rather than a global mapping from one thread to all + processors or one thread to one processor. + It has two variants, :term:`Weak APA` and :term:`Strong APA`. + aperiodic task A task which must execute only at irregular intervals and has only a soft deadline. @@ -777,6 +785,19 @@ Glossary :term:`return value` to indicate a successful operation or error conditions. + Strong APA + Strong APA is a specialization of :term:`APA`. + This variant of APA refers to a system model in which whenever a + :term:`thread` becomes ready for execution, recursively the processor + in the thread's affinity set is checked, followed by the processor in + the affinity set of threads that are assigned the processor present in + the ready thread's affinity set. This is done to find a thread to processor + mapping that does not violate the priority ordering and provide a schedule + with a higher total priority of the threads scheduled. + Similar analysis is done when a thread finishes its execution. + + :cite:`Cerqueira:2014:LPA` + suspend A term used to describe a task that is not competing for the CPU because it has had a ``rtems_task_suspend`` directive. @@ -905,6 +926,14 @@ Glossary Message queues, regions, and semaphores have a wait queue associated with them. + Weak APA + Weak APA is a specialization of :term:`APA`. + This refers to Linux's pull push implementation of APA model. + A ready thread is scheduled when a processor in its affinity set is idle + or is executing a thread which is at a lower priority. + + :cite:`Cerqueira:2014:LPA` + YAML This term is an acronym for `YAML Ain't Markup Language <https://yaml.org/>`_. -- 2.17.1 _______________________________________________ devel mailing list devel@rtems.org http://lists.rtems.org/mailman/listinfo/devel
