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diff --git a/c-user/config/general.rst b/c-user/config/general.rst index c366be3..b1bca61 100644 --- a/c-user/config/general.rst +++ b/c-user/config/general.rst @@ -288,64 +288,6 @@ NOTES: The default value of three file descriptors allows RTEMS to support standard input, output, and error I/O streams on ``/dev/console``. -.. index:: CONFIGURE_MAXIMUM_PRIORITY -.. index:: maximum priority -.. index:: number of priority levels - -.. _CONFIGURE_MAXIMUM_PRIORITY: - -CONFIGURE_MAXIMUM_PRIORITY --------------------------- - -CONSTANT: - ``CONFIGURE_MAXIMUM_PRIORITY`` - -OPTION TYPE: - This configuration option is an integer define. - -DEFAULT VALUE: - The default value is 255. - -VALUE CONSTRAINTS: - The value of this configuration option shall be - an element of {3, 7, 31, 63, 127, 255}. - -DESCRIPTION: - For the following schedulers - - * :ref:`SchedulerPriority`, which is the default in uniprocessor - configurations and can be configured through the - :ref:`CONFIGURE_SCHEDULER_PRIORITY` configuration option, - - * :ref:`SchedulerSMPPriority` which can be configured through the - :ref:`CONFIGURE_SCHEDULER_PRIORITY_SMP` configuration option, and - - * :ref:`SchedulerSMPPriorityAffinity` which can be configured through the - :ref:`CONFIGURE_SCHEDULER_PRIORITY_AFFINITY_SMP` configuration option - - this configuration option specifies the maximum numeric priority of any task - for these schedulers and one less that the number of priority levels for - these schedulers. For all other schedulers provided by RTEMS, this - configuration option has no effect. - -NOTES: - The numerically greatest priority is the logically lowest priority in the - system and will thus be used by the IDLE task. - - Priority zero is reserved for internal use by RTEMS and is not available to - applications. - - Reducing the number of priorities through this configuration option reduces - the amount of memory allocated by the schedulers listed above. These - schedulers use a chain control structure per priority and this structure - consists of three pointers. On a 32-bit architecture, the allocated memory - is 12 bytes * (``CONFIGURE_MAXIMUM_PRIORITY`` + 1), e.g. 3072 bytes for 256 - priority levels (default), 48 bytes for 4 priority levels - (``CONFIGURE_MAXIMUM_PRIORITY == 3``). - - The default value is 255, because RTEMS shall support 256 priority levels to - be compliant with various standards. These priorities range from 0 to 255. - .. index:: CONFIGURE_MAXIMUM_PROCESSORS .. _CONFIGURE_MAXIMUM_PROCESSORS: |