RTEMS | CPU Usage api (!864)

[Sam Price (@TheSamPrice)]

Sam Price commented on a discussion on cpukit/include/rtems/cpuuse.h: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/864#note_142780

 >  /* Forward declaration */
 >  struct rtems_printer;
 >  
 > +/**
 > + * @brief CPU usage snapshot.
 > + *
 > + * One instance describes a single thread's CPU usage at the time a sample is
 > + * taken.
 > + */
 > +typedef struct {
 > +  /** Thread identifier for the record. */
 > +  rtems_id           id;
 > +  /**
 > +   * CPU time this thread has consumed since the last reset. Use together with

The units would be defined in  the struct Timestamp_Control  task_total;

To get real units you would need to use the helper functions.
I guess these are internal helper calls because they are prefixed with _
```
| static __inline__ time_t    | _Timestamp_Get_seconds (const Timestamp_Control *_time)        |
|-----------------------------|----------------------------------------------------------------|
|                             | Gets seconds portion of timestamp. More...                     |
|                             |                                                                |
| static __inline__ uint32_t  | _Timestamp_Get_nanoseconds (const Timestamp_Control *_time)    |
|                             | Gets nanoseconds portion of timestamp. More...                 |
|                             |                                                                |
| static __inline__ uint64_t  | _Timestamp_Get_as_nanoseconds (const Timestamp_Control *_time) |
|                             | Gets the timestamp as nanoseconds. More...                     |
```

Please advise on how you want units handled.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/864#note_142780
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