Classic API Users Guide: Add SMP and affinity services.

This patch adds the initial version of the SMP chapter to the Users Guide.

1 files changed, 165 insertions, 0 deletions

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+@c
+@c  COPYRIGHT (c) 2014.
+@c  On-Line Applications Research Corporation (OAR).
+@c  All rights reserved. 
+@c
+
+@chapter Symmetric Multiprocessing Services
+
+@section Introduction
+
+This chapter describes the services related to Symmetric Multiprocessing
+provided by RTEMS. 
+
+The application level services currently provided are:
+
+@itemize @bullet
+@item @code{rtems_smp_get_processor_count} - Obtain Number of CPUs
+@item @code{rtems_task_get_affinity} - Obtain Task Affinity
+@item @code{rtems_task_set_affinity} - Set Task Affinity
+@end itemize
+
+@section Background
+
+@section Operations
+
+@section Directives
+
+This section details the symmetric multiprocessing services.  A subsection
+is dedicated to each of these services and describes the calling sequence,
+related constants, usage, and status codes.
+
+@c
+@c rtems_smp_get_processor_count
+@c
+@page
+@subsection rtems_smp_get_processor_count - Obtain Number of CPUs
+
+@subheading CALLING SEQUENCE:
+
+@ifset is-C
+@example
+#include <rtems.h>
+
+int rtems_smp_get_processor_count(void);
+@end example
+@end ifset
+
+@ifset is-Ada
+@end ifset
+
+@subheading STATUS CODES:
+
+Returns the number of processors being utilized.
+
+@subheading DESCRIPTION:
+
+The @code{rtems_smp_get_processor_count} routine is used to obtain the
+number of processor cores being utilized.
+
+@subheading NOTES:
+
+NONE
+
+@c
+@c rtems_task_get_affinity
+@c
+@page
+@subsection rtems_task_get_affinity - Obtain Task Affinity
+
+@subheading CALLING SEQUENCE:
+
+@ifset is-C
+@example
+#include <rtems.h>
+
+rtems_status_code rtems_task_get_affinity(
+  rtems_id             id,
+  size_t               cpusetsize,
+  cpu_set_t           *cpuset 
+);
+@end example
+@end ifset
+
+@ifset is-Ada
+@end ifset
+
+@subheading STATUS CODES:
+
+@table @b
+@item RTEMS_UNSATISFIED
+The cpuset pointer argument is invalid.
+
+@item RTEMS_UNSATISFIED
+The @code{cpusetsize} does not match the value of @code{affinitysetsize}
+field in the thread attribute object.
+
+@item RTEMS_INVALID_ID
+The @code{id} is invalid.
+
+@end table
+
+@subheading DESCRIPTION:
+
+The @code{rtems_task_get_affinity} routine is used to obtain the
+@code{affinityset} field from the thread object @code{id}.
+The value of this field is returned in @code{cpuset}
+
+@subheading NOTES:
+
+NONE
+
+@c
+@c rtems_task_set_affinity
+@c
+@page
+@subsection rtems_task_set_affinity - Set Task Affinity
+
+@subheading CALLING SEQUENCE:
+
+@ifset is-C
+@example
+#include <rtems.h>
+
+rtems_status_code rtems_task_set_affinity(
+  rtems_id             id,
+  size_t               cpusetsize,
+  cpu_set_t           *cpuset 
+);
+@end example
+@end ifset
+
+@ifset is-Ada
+@end ifset
+
+@subheading STATUS CODES:
+
+@table @b
+@item RTEMS_UNSATISFIED
+The cpuset pointer argument is invalid.
+
+@item RTEMS_UNSATISFIED
+The @code{cpusetsize} does not match the value of @code{affinitysetsize}
+field in the thread attribute object.
+
+@item RTEMS_UNSATISFIED
+The @code{cpuset} did not select a valid cpu.
+
+@item RTEMS_UNSATISFIED
+The @code{cpuset} selected a cpu that was invalid.
+
+@item RTEMS_INVALID_ID
+The @code{id} is invalid.
+
+@end table
+
+@subheading DESCRIPTION:
+
+The @code{rtems_task_set_affinity} routine is used to set the
+@code{affinity.set} field of the thread control object associated
+with @code{id}.  This value controls the cpuset that the task can
+execute on.
+
+@subheading NOTES:
+
+NONE