完成量實現線程同步

#include<linux/init.h>
#include<linux/module.h>
#include<linux/sched.h>
#include<linux/sem.h>
MODULE_LICENSE("Dual BSD/GPL");

struct completion my_completion1;
struct completion my_completion2;//定義了兩個完成量


int thread_dirver(void*);
int thread_saleman(void*);

int thread_driver(void*p)//司機線程

{
    printk(KERN_ALERT"DRIVER:I AM WAITING FOR SALEMAN CLOSED THE DOOR\n");
    wait_for_completion(&my_completion1);//等待完成量completion1

    printk(KERN_ALERT"DRIVER:OK , LET'S GO!NOW~\n");
    printk(KERN_ALERT"DRIVER:ARRIVE THE STATION.STOPED CAR!\n");
    complete(&my_completion2);//喚醒完成量completion2

    return 0;
}
int thread_saleman(void*p)//售票員線程

{
    printk(KERN_ALERT"SALEMAN:THE DOOR IS CLOSED!\n");
    complete(&my_completion1);//喚醒完成量completion1

    printk(KERN_ALERT"SALEMAN:YOU CAN GO NOW！\n");
    wait_for_completion(&my_completion2);//等待完成量completion2

    printk(KERN_ALERT"SALEMAN:OK,THE DOOR BE OPENED!\n");
    return 0;
}
static int hello_init(void)
{
    printk(KERN_ALERT"\nHello everybody~\n");
    init_completion(&my_completion1);
    init_completion(&my_completion2);//初始化完成量

    kernel_thread(thread_driver,NULL,CLONE_KERNEL);
    kernel_thread(thread_saleman,NULL,CLONE_KERNEL);//創建了兩個內核線程，

    return 0;
}
static void hello_exit(void)
{
    printk(KERN_ALERT"Goodbye everybody~\n");
}
module_init(hello_init);
module_exit(hello_exit);
MODULE_AUTHOR("CHEN");
MODULE_DESCRIPTION("A simple completion Module");