Well done, and I have some advice.

[SKTTelephoneFaker]

The code is too redundant, it is recommended to simplify to less than 100 lines, in fact, can be achieved with a single linked list. The looptime parameter is also unnecessary, you can pass a task pointer to the callback function and use the callback function to end the task.

[SKTTelephoneFaker]

here is my code

#ifndef GDTIMER_H
#define GDTIMER_H

#include "stdint.h"
#include "stdbool.h"

bool isTaskExist(uint32_t handler);
void RemoveTask(uint32_t handle);
void ScheduleTimer();
void InitGDTImer();

uint32_t AddGDTimer(void (*func)(uint32_t cur_task_handle), int interval);