Documentation | posix-user: Add getrusage (!31)

[Amar Takhar (@amar)]

Amar Takhar started a new discussion on posix-users/process_environment.rst: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/31#note_109517

 > +exist when the call is made and the field ``ru_stime`` returning the
 > +total idle time.
 > +
 > +A ``who`` value of ``RUSAGE_THREAD`` results in the ``struct rusage``
 > +field ``ru_utime`` returning the total active time of the current
 > +thread and the field ``ru_stime`` is set to 0.
 > +
 > +
 > +**NOTES:**
 > +
 > +The time returned can be more than the system up time if there is more
 > +than one CPU.
 > +
 > +This routine is implemented using the internal thread iterator and
 > +accounts for time spent by the currently active threads. RTEMS does
 > +not account for the execuiton time of threads that are no longer

execution

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/docs/rtems-docs/-/merge_requests/31#note_109517
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