用定时器将自己唤醒

#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/timer.h>

static struct timer_list timer;

static void timer_callback(unsigned long data)
{
    struct task_struct *task = (struct task_struct *)data;
    
    printk(KERN_ALERT "timer expires\n");
    wake_up_process(task);
}

static int __init dream_init(void)
{
    unsigned long expires;

    init_timer(&timer);
    expires = jiffies + HZ * 5;
    timer.expires = expires;
    timer.function = timer_callback;
    timer.data = (unsigned long)current;    
    add_timer(&timer);
    
    set_current_state(TASK_INTERRUPTIBLE);
    schedule();
    del_timer_sync(&timer);
    printk(KERN_ALERT "process continue running\n");

    return 0;
}

static void __exit dream_exit(void)
{
}

module_init(dream_init);
module_exit(dream_exit);
MODULE_LICENSE("GPL");