318007/buf0buf.i.2

   1 rw_lock_x_lock_func_nowait()
   2 {
   3         volatile long int lock_word;
   4      retry_x_lock:
   5 if (__sync_sub_and_fetch(&lock_word, 0x00100000))
   6                                 if (__sync_fetch_and_add
   7                                     (&lock_word, 0x00100000))
   8                                         goto retry_x_lock;
   9 }