使用prepare手工休眠

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

static DECLARE_WAIT_QUEUE_HEAD(queue);

static int __init sky_init(void)
{
    DEFINE_WAIT(wait);
    prepare_to_wait(&queue, &wait, TASK_INTERRUPTIBLE);
    schedule();
    finish_wait(&queue, &wait);
    if (signal_pending(current))
    {
        printk(KERN_ALERT "received a signal\n");
        goto signal_err;
    }
    
    printk(KERN_ALERT "hello\n");

    return 0;
signal_err:
    return -ERESTARTSYS;
}

static void __exit sky_exit(void)
{
}

module_init(sky_init);
module_exit(sky_exit);
MODULE_LICENSE("GPL");