自学教程：C++ timer_expired函数代码示例

/* * On success return number of bytes sent */int tty_write_timeout(const unsigned char *buf, size_t size, int timeout){	time_t timer;	int rc, pos = 0;		DEB((D_TTYIO, "tty_write_timeout: want write %d byte(s), timeout = %d", size, timeout));		tty_status = TTY_SUCCESS;	timer_set(&timer, timeout);		while( pos < size )	{		if( timer_expired(timer) )		{			break;		}		else if( (rc = tty_write(buf + pos, size - pos)) < 0 )		{			if( rc == TTY_TIMEOUT )				usleep(10000);	/* 0.01 sec */			else				return rc;		}		else /* ( rc > 0 ) */		{			DEB((D_TTYIO, "tty_write_timeout: written %d byte(s)", rc));			pos += rc;		}	}		return (pos > 0) ? pos : TTY_TIMEOUT;}

PROCESS_THREAD(ir_receiver_process, ev, data) {    PROCESS_BEGIN();    while(1) {        PROCESS_WAIT_EVENT();        if(ev == PROCESS_EVENT_POLL) {            if(ir_repeat) {                PRINTF("Got repeat signal /n");                ir_repeat = 0;            } else {                if(*(int32_t*)ir_prev_data != *(int32_t*)ir_last_data || timer_expired(&ir_rep_timer) || to_be_repeated()) {                    memcpy(ir_prev_data, ir_last_data, 4);                    timer_restart(&ir_rep_timer);                    PRINTF("Got new command %d,%d,%d,%d!/n", ir_last_data[0],ir_last_data[1],ir_last_data[2],ir_last_data[3]);                    broadcast_value(30);                } else {                    timer_restart(&ir_rep_timer);                }            }        }    }    PROCESS_END();}

/*---------------------------------------------------------------------------*/static voidweather_meter_interrupt_handler(uint8_t port, uint8_t pin){  uint32_t aux;  /* Prevent bounce events */  if(!timer_expired(&debouncetimer)) {    return;  }  timer_set(&debouncetimer, DEBOUNCE_DURATION);  /* We make a process_post() to check in the pollhandler any specific threshold   * value   */  if((port == ANEMOMETER_SENSOR_PORT) && (pin == ANEMOMETER_SENSOR_PIN)) {    weather_sensors.anemometer.ticks++;    process_post(&weather_meter_int_process, anemometer_int_event, NULL);  } else if((port == RAIN_GAUGE_SENSOR_PORT) && (pin == RAIN_GAUGE_SENSOR_PIN)) {    weather_sensors.rain_gauge.ticks++;    aux = weather_sensors.rain_gauge.ticks * WEATHER_METER_AUX_RAIN_MM;    aux /= 1000;    weather_sensors.rain_gauge.value = (uint16_t)aux;    process_post(&weather_meter_int_process, rain_gauge_int_event, NULL);  }}

void SerialIPStack::tick(){	uip_len = slipdev_poll();	if(uip_len > 0) {		uip_input();		// If the above function invocation resulted in data that		// should be sent out on the network, the global variable		// uip_len is set to a value > 0.		if (uip_len > 0) slipdev_send();	} else if (timer_expired(&periodic_timer)) {		timer_reset(&periodic_timer);		for (int i = 0; i < UIP_CONNS; i++) {			uip_periodic(i);			// If the above function invocation resulted in data that			// should be sent out on the network, the global variable			// uip_len is set to a value > 0.			if (uip_len > 0) slipdev_send();		}#if UIP_UDP		for (int i = 0; i < UIP_UDP_CONNS; i++) {			uip_udp_periodic(i);			// If the above function invocation resulted in data that			// should be sent out on the network, the global variable			// uip_len is set to a value > 0. */			if (uip_len > 0) slipdev_send();		}#endif /* UIP_UDP */	}}

/*---------------------------------------------------------------------------*/static intuser_button_value(int type){  return (GPIO_READ_PIN(USER_BUTTON_PORT_BASE,                        USER_BUTTON_PIN_MASK) == 0) ||    !timer_expired(&debouncetimer);}

static void igmp_group_periodic(igmp_group_state_t *s){  switch (s->state)    {    case NON_MEMBER:    case IDLE_MEMBER:      break;    case PENDING_JOIN:            send_membership_report(s);      s->flag = 1;      s->state = DELAYED_MEMBER;      timer_set(&s->timer, UNSOLICITED_REPORT_INTERVAL * CLOCK_SECOND);      break;    case DELAYED_MEMBER:      if (timer_expired(&s->timer))  {        send_membership_report(s);        s->flag = 1;        s->state = IDLE_MEMBER;      }      break;    case PENDING_LEAVE:      if (s->flag)        send_leave_group(s);      s->state = NON_MEMBER;      break;    }    return;}

void music_bars(){    unsigned int eq_buffer[14];    int i;        // Run this for 10 seconds    set_timer(10000);        while(!timer_expired())    {        EQ_Read(eq_buffer);        fill(0x00);        // Basen l
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