static int Stall (int its) {

  {- -------------------------------------------
  (1) 引数で指定された回数分(its)だけ MarsagliaXORV() を呼び出してスピンループする.
      ---------------------------------------- -}

      static volatile jint rv = 1 ;
      volatile int OnFrame = 0 ;
      jint v = rv ^ UNS(OnFrame) ;
      while (--its >= 0) {
        v = MarsagliaXORV (v) ;
      }
      // Make this impossible for the compiler to optimize away,
      // but (mostly) avoid W coherency sharing on MP systems.
      if (v == 0x12345) rv = v ;
      return v ;
    }