fpvars
return (thr_main() ? &__nan_written : &fpvars->__nan_written);
return (thr_main() ? &__nan_read : &fpvars->__nan_read);
return (thr_main() ? &__inf_written : &fpvars->__inf_written);
return (thr_main() ? &__inf_read : &fpvars->__inf_read);