if(!rt_mutex_acquire(&UART_ReadMutex, TM_INFINITE )){

int prevstate;

if((prevstate=uartDevReadBuf_plc_state) == FULL){

uartDevReadBuf_plc_state = LOCKED;

}

rt_mutex_release(&UART_ReadMutex);

if(prevstate == FULL){

%(retrieve_code)s

/* unlock plc buffer */

uartDevReadBuf_plc_state = EMPTY;

}else{

/* No new data -> no update */

}

}