ruby_thread_set_native  366 thread.c           ruby_thread_set_native(th);
ruby_thread_set_native 3787 thread.c           (void)ruby_thread_set_native;
ruby_thread_set_native  169 thread_pthread.c     ruby_thread_set_native(th);
ruby_thread_set_native   53 thread_win32.c     ruby_thread_set_native(th);