RTEMS | CPU Usage api (!864)

[Sam Price (@TheSamPrice)]

Sam Price started a new discussion on cpukit/libmisc/cpuuse/cpuusagereport.c: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/864#note_141986

 > +  if ( the_thread == NULL ) {
 > +#if defined(RTEMS_MULTIPROCESSING)
 > +    if ( _Thread_MP_Is_remote( id ) ) {
 > +      return RTEMS_ILLEGAL_ON_REMOTE_OBJECT;
 > +    }
 > +#endif
 > +    return RTEMS_INVALID_ID;
 > +  }
 > +
 > +  /*
 > +   * Keep interrupts disabled while sampling uptime and thread usage so the
 > +   * totals represent a consistent point in time (avoid a tick between reads).
 > +   */
 > +  Timestamp_Control total = cpu_usage_total_cpu_time();
 > +  cpu_usage_populate( the_thread, &total, info );
 > +  _ISR_lock_ISR_enable( &lock_context );

the isr lock out I wasn't thrilled about.
Also does a lock out occur if 
    if ( _Thread_MP_Is_remote( id ) ) {

this happens, if so that else case needs an extra  isr enable.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/rtos/rtems/-/merge_requests/864#note_141986
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