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c-user: Clarify global construction

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Sebastian Huber 2023-07-24 07:50:53 +02:00
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c-user/initialization/operations.rst
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@ -285,19 +285,24 @@ Many of RTEMS actions during initialization are based upon the contents of the
Configuration Table. For more information regarding the format and contents of
this table, please refer to the chapter :ref:`Configuring a System`.
.. index:: global construction
.. _GlobalConstruction:
Global Construction
-------------------
The global construction is carried out by the first Classic API initialization
task (first is defined by index zero in the Classic API initialization task
configuration table). If no Classic API initialization task exists, then it is
carried out by the first POSIX API initialization thread. If no initialization
task or thread exists, then no global construction is performed, see for
example :ref:`Specify Idle Task Performs Application Initialization`. The
Classic API task or POSIX API thread which carries out global construction is
called the main thread.
The :term:`global construction` is carried out by the Classic API
initialization task. If no Classic API initialization task exists, then it is
carried out by the POSIX API initialization thread. If no initialization task
or thread exists, then no global construction is performed. The Classic API
task or POSIX API thread which carries out global construction is called the
main thread. For configuration options related to initialization tasks, see
:ref:`CONFIGURE_RTEMS_INIT_TASKS_TABLE`,
:ref:`CONFIGURE_POSIX_INIT_THREAD_TABLE`, and
:ref:`CONFIGURE_IDLE_TASK_INITIALIZES_APPLICATION`.
Global construction runs before the entry function of the main thread. The
Global construction runs before the :term:`task entry` of the main thread. The
configuration of the main thread must take the global construction into
account. In particular, the main thread stack size, priority, attributes and
initial modes must be set accordingly. Thread-local objects and POSIX key