if ((thrd_create(&rk->rk_thread,
        rd_kafka_thread_main, rk))
    != thrd_success) {
    rk->rk_init_wait_cnt--;
    ret_err = RD_KAFKA_RESP_ERR__CRIT_SYS_RESOURCE;
    ret_errno = errno;
    if (errstr)
        rd_snprintf(errstr, errstr_size,
            "Failed to create thread: %s (%i)",
            rd_strerror(errno), errno);
    // some code here
}