c-user: Move "General Scheduler Configuration"

Update #3836.

2 files changed, 390 insertions, 386 deletions

diff --git a/c-user/config/index.rst b/c-user/config/index.rst
index 912d8b3..1afc3ed 100644
--- a/c-user/config/index.rst
+++ b/c-user/config/index.rst
@@ -1,6 +1,5 @@
 .. SPDX-License-Identifier: CC-BY-SA-4.0
 
-.. Copyright (C) 2010 Gedare Bloom
 .. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
 
 .. index:: configuring a system
@@ -23,391 +22,7 @@ Configuring a System
     bdbuf
     bsp-related
     idle-task
-
-General Scheduler Configuration
-===============================
-
-This section defines the configuration parameters related to selecting a
-scheduling algorithm for an application.  A scheduler configuration is optional
-and only necessary in very specific circumstances.  A normal application
-configuration does not need any of the configuration options described in this
-section.  By default, the :ref:`Deterministic Priority Scheduler
-<SchedulerPriority>` algorithm is used in uniprocessor configurations.  In case
-SMP is enabled and the configured maximum processors
-(:ref:`CONFIGURE_MAXIMUM_PROCESSORS <CONFIGURE_MAXIMUM_PROCESSORS>`) is greater
-than one, then the :ref:`Earliest Deadline First (EDF) SMP Scheduler
-<SchedulerSMPEDF>` is selected as the default scheduler algorithm.
-
-For the :ref:`schedulers built into
-RTEMS <SchedulingConcepts>`, the configuration is straightforward.  All that is
-required is to define the configuration macro which specifies which scheduler
-you want for in your application.
-
-The pluggable scheduler interface also enables the user to provide their own
-scheduling algorithm.  If you choose to do this, you must define multiple
-configuration macros.
-
-.. index:: CONFIGURE_SCHEDULER_CBS
-
-.. _CONFIGURE_SCHEDULER_CBS:
-
-CONFIGURE_SCHEDULER_CBS
------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_CBS``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    If defined, then the :ref:`Constant Bandwidth Server (CBS) Scheduler
-    <SchedulerCBS>` algorithm is made available to the application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for exactly one processor.
-
-.. index:: CONFIGURE_SCHEDULER_EDF
-
-.. _CONFIGURE_SCHEDULER_EDF:
-
-CONFIGURE_SCHEDULER_EDF
------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_EDF``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    If defined, then the :ref:`Earliest Deadline First (EDF) Scheduler
-    <SchedulerEDF>` algorithm is made available to the application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for exactly one processor.
-
-.. index:: CONFIGURE_SCHEDULER_EDF_SMP
-
-.. _CONFIGURE_SCHEDULER_EDF_SMP:
-
-CONFIGURE_SCHEDULER_EDF_SMP
----------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_EDF_SMP``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    If defined, then the :ref:`Earliest Deadline First (EDF) SMP Scheduler
-    <SchedulerSMPEDF>` algorithm is made available to the application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    This scheduler algorithm is only available when RTEMS is built with SMP
-    support enabled.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for up to 32 processors.
-
-    This scheduler algorithm is the default in SMP configurations if
-    :ref:`CONFIGURE_MAXIMUM_PROCESSORS <CONFIGURE_MAXIMUM_PROCESSORS>` is
-    greater than one.
-
-.. index:: CONFIGURE_SCHEDULER_NAME
-
-.. _CONFIGURE_SCHEDULER_NAME:
-
-CONFIGURE_SCHEDULER_NAME
-------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_NAME``
-
-DATA TYPE:
-    RTEMS Name (``rtems_name``).
-
-RANGE:
-    Any value.
-
-DEFAULT VALUE:
-    The default name is
-
-      - ``"MEDF"`` for the :ref:`EDF SMP Scheduler <SchedulerSMPEDF>`,
-      - ``"MPA "`` for the :ref:`Arbitrary Processor Affinity Priority SMP Scheduler <SchedulerSMPPriorityAffinity>`,
-      - ``"MPD "`` for the :ref:`Deterministic Priority SMP Scheduler <SchedulerSMPPriority>`,
-      - ``"MPS "`` for the :ref:`Simple Priority SMP Scheduler <SchedulerSMPPrioritySimple>`,
-      - ``"UCBS"`` for the :ref:`Uniprocessor CBS Scheduler <SchedulerCBS>`,
-      - ``"UEDF"`` for the :ref:`Uniprocessor EDF Scheduler <SchedulerEDF>`,
-      - ``"UPD "`` for the :ref:`Uniprocessor Deterministic Priority Scheduler <SchedulerPriority>`, and
-      - ``"UPS "`` for the :ref:`Uniprocessor Simple Priority Scheduler <SchedulerPrioritySimple>`.
-
-DESCRIPTION:
-    Schedulers can be identified via ``rtems_scheduler_ident``.  The name of
-    the scheduler is determined by the configuration.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-.. index:: CONFIGURE_SCHEDULER_PRIORITY
-
-.. _CONFIGURE_SCHEDULER_PRIORITY:
-
-CONFIGURE_SCHEDULER_PRIORITY
-----------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_PRIORITY``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is defined by default.  This is the default scheduler and specifying
-    this configuration parameter is redundant.
-
-DESCRIPTION:
-    If defined, then the :ref:`Deterministic Priority Scheduler
-    <SchedulerPriority>` algorithm is made available to the application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for exactly one processor.
-
-    This scheduler algorithm is the default when
-    :ref:`CONFIGURE_MAXIMUM_PROCESSORS <CONFIGURE_MAXIMUM_PROCESSORS>` is
-    exactly one.
-
-    The memory allocated for this scheduler depends on the
-    :ref:`CONFIGURE_MAXIMUM_PRIORITY` configuration option.
-
-.. index:: CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP
-
-.. _CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP:
-
-CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP
------------------------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    If defined, then the :ref:`Arbitrary Processor Affinity SMP Scheduler
-    <SchedulerSMPPriorityAffinity>` algorithm is made available to the
-    application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    This scheduler algorithm is only available when RTEMS is built with SMP
-    support enabled.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for up to 32 processors.
-
-    The memory allocated for this scheduler depends on the
-    :ref:`CONFIGURE_MAXIMUM_PRIORITY` configuration option.
-
-.. index:: CONFIGURE_SCHEDULER_PRIORITY_SMP
-
-.. _CONFIGURE_SCHEDULER_PRIORITY_SMP:
-
-CONFIGURE_SCHEDULER_PRIORITY_SMP
---------------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_PRIORITY_SMP``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    If defined, then the :ref:`Deterministic Priority SMP Scheduler
-    <SchedulerSMPPriority>` algorithm is made available to the application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    This scheduler algorithm is only available when RTEMS is built with SMP
-    support enabled.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for up to 32 processors.
-
-    The memory allocated for this scheduler depends on the
-    :ref:`CONFIGURE_MAXIMUM_PRIORITY` configuration option.
-
-.. index:: CONFIGURE_SCHEDULER_SIMPLE
-
-.. _CONFIGURE_SCHEDULER_SIMPLE:
-
-CONFIGURE_SCHEDULER_SIMPLE
---------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_SIMPLE``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    If defined, then the :ref:`Simple Priority Scheduler
-    <SchedulerPrioritySimple>` algorithm is made available to the application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for exactly one processor.
-
-.. index:: CONFIGURE_SCHEDULER_SIMPLE_SMP
-
-.. _CONFIGURE_SCHEDULER_SIMPLE_SMP:
-
-CONFIGURE_SCHEDULER_SIMPLE_SMP
-------------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_SIMPLE_SMP``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    If defined, then the :ref:`Simple Priority SMP Scheduler
-    <SchedulerSMPPrioritySimple>` algorithm is made available to the
-    application.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    This scheduler algorithm is only available when RTEMS is built with SMP
-    support enabled.
-
-    In case no explicit :ref:`clustered scheduler configuration
-    <ConfigurationSchedulersClustered>` is present, then it is used as the
-    scheduler for up to 32 processors.
-
-.. index:: CONFIGURE_SCHEDULER_USER
-
-.. _CONFIGURE_SCHEDULER_USER:
-
-CONFIGURE_SCHEDULER_USER
-------------------------
-
-CONSTANT:
-    ``CONFIGURE_SCHEDULER_USER``
-
-DATA TYPE:
-    Boolean feature macro.
-
-RANGE:
-    Defined or undefined.
-
-DEFAULT VALUE:
-    This is not defined by default.
-
-DESCRIPTION:
-    RTEMS allows the application to provide its own task/thread scheduling
-    algorithm. In order to do this, one must define
-    ``CONFIGURE_SCHEDULER_USER`` to indicate the application provides its own
-    scheduling algorithm. If ``CONFIGURE_SCHEDULER_USER`` is defined then the
-    following additional macros must be defined:
-
-    - ``CONFIGURE_SCHEDULER`` must be defined to a static definition of
-      the scheduler data structures of the user scheduler.
-
-    - ``CONFIGURE_SCHEDULER_TABLE_ENTRIES`` must be defined to a scheduler
-      table entry initializer for the user scheduler.
-
-    - ``CONFIGURE_SCHEDULER_USER_PER_THREAD`` must be defined to the type of
-      the per-thread information of the user scheduler.
-
-NOTES:
-    This scheduler configuration option is an advanced configuration option.
-    Think twice before you use it.
-
-    At this time, the mechanics and requirements for writing a new scheduler
-    are evolving and not fully documented.  It is recommended that you look at
-    the existing Deterministic Priority Scheduler in
-    ``cpukit/score/src/schedulerpriority*.c`` for guidance.  For guidance on
-    the configuration macros, please examine ``cpukit/sapi/include/confdefs.h``
-    for how these are defined for the Deterministic Priority Scheduler.
+    scheduler-general
 
 .. _ConfigurationSchedulersClustered:
 
diff --git a/c-user/config/scheduler-general.rst b/c-user/config/scheduler-general.rst
new file mode 100644
index 0000000..05fce6e
--- /dev/null
+++ b/c-user/config/scheduler-general.rst
@@ -0,0 +1,389 @@
+.. SPDX-License-Identifier: CC-BY-SA-4.0
+
+.. Copyright (C) 2010 Gedare Bloom
+.. Copyright (C) 1988, 2008 On-Line Applications Research Corporation (OAR)
+
+General Scheduler Configuration
+===============================
+
+This section defines the configuration parameters related to selecting a
+scheduling algorithm for an application.  A scheduler configuration is optional
+and only necessary in very specific circumstances.  A normal application
+configuration does not need any of the configuration options described in this
+section.  By default, the :ref:`Deterministic Priority Scheduler
+<SchedulerPriority>` algorithm is used in uniprocessor configurations.  In case
+SMP is enabled and the configured maximum processors
+(:ref:`CONFIGURE_MAXIMUM_PROCESSORS <CONFIGURE_MAXIMUM_PROCESSORS>`) is greater
+than one, then the :ref:`Earliest Deadline First (EDF) SMP Scheduler
+<SchedulerSMPEDF>` is selected as the default scheduler algorithm.
+
+For the :ref:`schedulers built into
+RTEMS <SchedulingConcepts>`, the configuration is straightforward.  All that is
+required is to define the configuration macro which specifies which scheduler
+you want for in your application.
+
+The pluggable scheduler interface also enables the user to provide their own
+scheduling algorithm.  If you choose to do this, you must define multiple
+configuration macros.
+
+.. index:: CONFIGURE_SCHEDULER_CBS
+
+.. _CONFIGURE_SCHEDULER_CBS:
+
+CONFIGURE_SCHEDULER_CBS
+-----------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_CBS``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    If defined, then the :ref:`Constant Bandwidth Server (CBS) Scheduler
+    <SchedulerCBS>` algorithm is made available to the application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for exactly one processor.
+
+.. index:: CONFIGURE_SCHEDULER_EDF
+
+.. _CONFIGURE_SCHEDULER_EDF:
+
+CONFIGURE_SCHEDULER_EDF
+-----------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_EDF``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    If defined, then the :ref:`Earliest Deadline First (EDF) Scheduler
+    <SchedulerEDF>` algorithm is made available to the application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for exactly one processor.
+
+.. index:: CONFIGURE_SCHEDULER_EDF_SMP
+
+.. _CONFIGURE_SCHEDULER_EDF_SMP:
+
+CONFIGURE_SCHEDULER_EDF_SMP
+---------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_EDF_SMP``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    If defined, then the :ref:`Earliest Deadline First (EDF) SMP Scheduler
+    <SchedulerSMPEDF>` algorithm is made available to the application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    This scheduler algorithm is only available when RTEMS is built with SMP
+    support enabled.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for up to 32 processors.
+
+    This scheduler algorithm is the default in SMP configurations if
+    :ref:`CONFIGURE_MAXIMUM_PROCESSORS <CONFIGURE_MAXIMUM_PROCESSORS>` is
+    greater than one.
+
+.. index:: CONFIGURE_SCHEDULER_NAME
+
+.. _CONFIGURE_SCHEDULER_NAME:
+
+CONFIGURE_SCHEDULER_NAME
+------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_NAME``
+
+DATA TYPE:
+    RTEMS Name (``rtems_name``).
+
+RANGE:
+    Any value.
+
+DEFAULT VALUE:
+    The default name is
+
+      - ``"MEDF"`` for the :ref:`EDF SMP Scheduler <SchedulerSMPEDF>`,
+      - ``"MPA "`` for the :ref:`Arbitrary Processor Affinity Priority SMP Scheduler <SchedulerSMPPriorityAffinity>`,
+      - ``"MPD "`` for the :ref:`Deterministic Priority SMP Scheduler <SchedulerSMPPriority>`,
+      - ``"MPS "`` for the :ref:`Simple Priority SMP Scheduler <SchedulerSMPPrioritySimple>`,
+      - ``"UCBS"`` for the :ref:`Uniprocessor CBS Scheduler <SchedulerCBS>`,
+      - ``"UEDF"`` for the :ref:`Uniprocessor EDF Scheduler <SchedulerEDF>`,
+      - ``"UPD "`` for the :ref:`Uniprocessor Deterministic Priority Scheduler <SchedulerPriority>`, and
+      - ``"UPS "`` for the :ref:`Uniprocessor Simple Priority Scheduler <SchedulerPrioritySimple>`.
+
+DESCRIPTION:
+    Schedulers can be identified via ``rtems_scheduler_ident``.  The name of
+    the scheduler is determined by the configuration.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+.. index:: CONFIGURE_SCHEDULER_PRIORITY
+
+.. _CONFIGURE_SCHEDULER_PRIORITY:
+
+CONFIGURE_SCHEDULER_PRIORITY
+----------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_PRIORITY``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is defined by default.  This is the default scheduler and specifying
+    this configuration parameter is redundant.
+
+DESCRIPTION:
+    If defined, then the :ref:`Deterministic Priority Scheduler
+    <SchedulerPriority>` algorithm is made available to the application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for exactly one processor.
+
+    This scheduler algorithm is the default when
+    :ref:`CONFIGURE_MAXIMUM_PROCESSORS <CONFIGURE_MAXIMUM_PROCESSORS>` is
+    exactly one.
+
+    The memory allocated for this scheduler depends on the
+    :ref:`CONFIGURE_MAXIMUM_PRIORITY` configuration option.
+
+.. index:: CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP
+
+.. _CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP:
+
+CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP
+-----------------------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    If defined, then the :ref:`Arbitrary Processor Affinity SMP Scheduler
+    <SchedulerSMPPriorityAffinity>` algorithm is made available to the
+    application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    This scheduler algorithm is only available when RTEMS is built with SMP
+    support enabled.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for up to 32 processors.
+
+    The memory allocated for this scheduler depends on the
+    :ref:`CONFIGURE_MAXIMUM_PRIORITY` configuration option.
+
+.. index:: CONFIGURE_SCHEDULER_PRIORITY_SMP
+
+.. _CONFIGURE_SCHEDULER_PRIORITY_SMP:
+
+CONFIGURE_SCHEDULER_PRIORITY_SMP
+--------------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_PRIORITY_SMP``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    If defined, then the :ref:`Deterministic Priority SMP Scheduler
+    <SchedulerSMPPriority>` algorithm is made available to the application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    This scheduler algorithm is only available when RTEMS is built with SMP
+    support enabled.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for up to 32 processors.
+
+    The memory allocated for this scheduler depends on the
+    :ref:`CONFIGURE_MAXIMUM_PRIORITY` configuration option.
+
+.. index:: CONFIGURE_SCHEDULER_SIMPLE
+
+.. _CONFIGURE_SCHEDULER_SIMPLE:
+
+CONFIGURE_SCHEDULER_SIMPLE
+--------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_SIMPLE``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    If defined, then the :ref:`Simple Priority Scheduler
+    <SchedulerPrioritySimple>` algorithm is made available to the application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for exactly one processor.
+
+.. index:: CONFIGURE_SCHEDULER_SIMPLE_SMP
+
+.. _CONFIGURE_SCHEDULER_SIMPLE_SMP:
+
+CONFIGURE_SCHEDULER_SIMPLE_SMP
+------------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_SIMPLE_SMP``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    If defined, then the :ref:`Simple Priority SMP Scheduler
+    <SchedulerSMPPrioritySimple>` algorithm is made available to the
+    application.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    This scheduler algorithm is only available when RTEMS is built with SMP
+    support enabled.
+
+    In case no explicit :ref:`clustered scheduler configuration
+    <ConfigurationSchedulersClustered>` is present, then it is used as the
+    scheduler for up to 32 processors.
+
+.. index:: CONFIGURE_SCHEDULER_USER
+
+.. _CONFIGURE_SCHEDULER_USER:
+
+CONFIGURE_SCHEDULER_USER
+------------------------
+
+CONSTANT:
+    ``CONFIGURE_SCHEDULER_USER``
+
+DATA TYPE:
+    Boolean feature macro.
+
+RANGE:
+    Defined or undefined.
+
+DEFAULT VALUE:
+    This is not defined by default.
+
+DESCRIPTION:
+    RTEMS allows the application to provide its own task/thread scheduling
+    algorithm. In order to do this, one must define
+    ``CONFIGURE_SCHEDULER_USER`` to indicate the application provides its own
+    scheduling algorithm. If ``CONFIGURE_SCHEDULER_USER`` is defined then the
+    following additional macros must be defined:
+
+    - ``CONFIGURE_SCHEDULER`` must be defined to a static definition of
+      the scheduler data structures of the user scheduler.
+
+    - ``CONFIGURE_SCHEDULER_TABLE_ENTRIES`` must be defined to a scheduler
+      table entry initializer for the user scheduler.
+
+    - ``CONFIGURE_SCHEDULER_USER_PER_THREAD`` must be defined to the type of
+      the per-thread information of the user scheduler.
+
+NOTES:
+    This scheduler configuration option is an advanced configuration option.
+    Think twice before you use it.
+
+    At this time, the mechanics and requirements for writing a new scheduler
+    are evolving and not fully documented.  It is recommended that you look at
+    the existing Deterministic Priority Scheduler in
+    ``cpukit/score/src/schedulerpriority*.c`` for guidance.  For guidance on
+    the configuration macros, please examine ``cpukit/sapi/include/confdefs.h``
+    for how these are defined for the Deterministic Priority Scheduler.