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# Timer Handler
To handle the tasks of LVGL you need to call `lv_timer_handler()` periodically in one of the following:
- *while(1)* of *main()* function
- timer interrupt periodically (lower priority than `lv_tick_inc()`)
- an OS task periodically
The timing is not critical but it should be about 5 milliseconds to keep the system responsive.
Example:
```c
while(1) {
lv_timer_handler();
my_delay_ms(5);
}
```
If you want to use `lv_timer_handler()` in a super-loop, a helper function`lv_timer_handler_run_in_period()` is provided to simplify the porting:
```c
while(1) {
...
lv_timer_handler_run_in_period(5); /* run lv_timer_handler() every 5ms */
...
}
```
In an OS environment, you can use it together with the **delay** or **sleep** provided by OS to release CPU whenever possible:
```c
while (1) {
lv_timer_handler_run_in_period(5); /* run lv_timer_handler() every 5ms */
my_delay_ms(5); /* delay 5ms to avoid unnecessary polling */
}
```
To learn more about timers visit the [Timer](/overview/timer) section.
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