内核定时器

struct list_head

{

struct list_head *next;

struct list_head *prev;

};

expires = jiffies + 5*HZ; 定时5秒，时间到后执行function函数，data是传递给该函数的参数。

struct timer_list

{

struct list_head entry;

unsigned long expires; 

void (*function)(unsigned long);

unsigned long data;

struct tvec_base *base;  

};

void init_timer(struct timer_list *timer);初始化定时器

void add_timer(struct timer_list *timer); 启动定时器

int del_timer(struct timer_list *timer);

在定时器超时前将它删除，当定时器超时后，系统自动将它删除。


如果对时间要求不是很精确的情况下可以这么做：
int delay_t = 5;
unsigned long jiffies_t = jiffies + delay_t * HZ;
while(jiffies >=jiffies_t)
{
do something!
}