linux驱动 wait

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

static DECLARE_WAIT_QUEUE_HEAD(my_wait_queue);
static int condition = 0;

static int __init my_module_init(void)
{
    printk(KERN_INFO "Module loaded
");
    return 0;
}

static void __exit my_module_exit(void)
{
    printk(KERN_INFO "Module unloaded
");
}

static ssize_t my_read(struct file *filp, char __user *buf, size_t count, loff_t *off)
{
    wait_event_interruptible(my_wait_queue, condition);
    // 模拟条件满足
    condition = 0;
    return 0;
}

static ssize_t my_write(struct file *filp, const char __user *buf, size_t count, loff_t *off)
{
    // 模拟条件满足
    condition = 1;
    wake_up(&my_wait_queue);
    return count;
}

static const struct file_operations fops = {
    .owner = THIS_MODULE,
    .read = my_read,
    .write = my_write,
};

module_init(my_module_init);
module_exit(my_module_exit);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Your Name");
MODULE_DESCRIPTION("A simple wait queue example");