Function if

deps/quickjs/quickjs-libc.c:2952–2963

        }
#ifdef USE_WORKER
        else if (flags & JS_OS_POLL_WORKERS) {
            list_for_each(el, &ts->port_list) {
                JSWorkerMessageHandler *port = list_entry(el, JSWorkerMessageHandler, link);
                if (!JS_IsNull(port->on_message_func)) {
                    JSWorkerMessagePipe *ps = port->recv_pipe;
                    if (pfd->fd == ps->waker.read_fd) {
                        if (handle_posted_message(rt, ctx, port))
                            goto done;
                    }
                }
            }
        }
#endif // USE_WORKER
    }
done: