Linux Device Drivers Development

The timer API

A timer is represented in the kernel as an instance of timer_list:

#include <linux/timer.h> 
 
struct timer_list { 
    struct list_head entry; 
    unsigned long expires; 
    struct tvec_t_base_s *base; 
    void (*function)(unsigned long); 
    unsigned long data; 
); 

expires is an absolute value in jiffies. entry is a doubly linked list and data is optional, and passed to the callback function.