linux内核--定时器API

/**<linux/timer.h> 定时器结构体struct timer_list {    ........    unsigned long expires; --内核希望定时器执行的jiffies值    void (*function)(unsigned long);  --定时器到时时执行的函数    unsigned long data;  --传入执行函数的参数*//**<linux/time.h> 该函数将墙钟时间转换为jiffies值extern unsigned long mktime(const unsigned int year, const unsigned                                        int mon, const unsigned int day,                                 const unsigned int hour,                                 const unsigned int min,                                 const unsigned int sec)       */#include <linux/init.h>#include <linux/module.h>#include <linux/kernel.h>#include <linux/timer.h>#include <linux/time.h>#include <linux/moduleparam.h>#include <linux/stat.h>#include <linux/sched.h>static int year;static int mon;static int day;static int hour;static int min;static int sec;static long data;static int flag = 0;static int time;static struct timer_list timer;module_param(year, int, S_IRUGO);module_param(mon, int, S_IRUGO);module_param(day, int, S_IRUGO);module_param(hour, int, S_IRUGO);module_param(min, int, S_IRUGO);module_param(sec, int, S_IRUGO);module_param(data, long, S_IRUGO);module_param(time, int, S_IRUGO);module_param(flag, int, S_IRUGO);void handler(unsigned long data){    int i=0;    for (i=0; i<10; i++)    {        printk(KERN_ALERT "%d ", i);    }    printk(KERN_ALERT "\n");}static int __init Example_init(void){    unsigned long j = jiffies;    printk(KERN_ALERT "Example_init.\n");    init_timer(&timer);   //初始化结构体    if (flag)        timer.expires = mktime(year, mon, day, hour, min, sec);    else        timer.expires = j + time;    timer.function = handler;    timer.data = data;    add_timer(&timer);  //向内核添加定时器    return 0;}static void __exit Example_exit(void){    printk(KERN_ALERT "Example_exit.\n");    del_timer(&timer);  //删除定时器    /**以下函数确保在函数返回时没有其他cpu在运行此定时器函数     int del_timer_sync(struct timer_list *timer)     */    return;}MODULE_LICENSE("Dual BSD/GPL");MODULE_AUTHOR("Flying");module_init(Example_init);module_exit(Example_exit);