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Kernel_Timer

####内核中定时器的使用 关键函数:

init_timer(&tmp_timer);	//初始化定时器  
add_timer(&tmp_timer);//启动定时器  
del_timer(&tmp_timer);//关闭定时器  
tmp_timer.expires = jiffies + (10*HZ);//延时10s打印
tmp_timer.data = 0;//函数传参
tmp_timer.function = print;//调用延时后的函数
for_each_process(task_p){}//遍历进程
static struct task_struct *task_p; //task_struct结构体

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