// Note that yield semantics are defined by the scheduling class to which
// the thread currently belongs.  Typically, yield will _not yield to
// other equal or higher priority threads that reside on the dispatch queues
// of other CPUs.

  {- -------------------------------------------
  (1) thr_yield() システムコールを呼びだすだけ.
      ---------------------------------------- -}

    os::YieldResult os::NakedYield() { thr_yield(); return os::YIELD_UNKNOWN; }