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wait_event(queue, condition)
wait_event_interruptible(queue, condition)
wait_event_timeout(queue, condition, timeout)
wait_event_interruptible_timeout(queue, condition, timeout)
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condition¿ÉÒÔÔÚÈκεط½±»¸Ä±ä£¬µ«¸Ä±äʱÐëwake_up µÈ´ý¶ÓÁÐwqÀïÃæµÄprocess¡£
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void wake_up(wait_queue_head_t *queue);   //»½ÐÑËùÓÐ
void wake_up_interruptible(wait_queue_head_t *queue); //»½ÐÑinterruptible
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#ifndef __KERNEL__
#define __KERNEL__
#endif
#ifndef MODULE
#define MODULE
#endif
#include <linux/module.h>
#include <linux/init.h>
#include <linux/fs.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <asm/uaccess.h>
#include <asm/semaphore.h>
MODULE_LICENSE("GPL");
#define MAJOR_NUM 250 //Ö÷É豸ºÅ
static ssize_t globalvar_read(struct file *, char *, size_t, loff_t*);
static ssize_t globalvar_write(struct file *, const char *, size_t, loff_t*);
static int globalvar_open(struct inode *,struct file *);


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