线程互斥锁

#include <stdio.h>
#include <stdlib.h>
#include <pthread.h> //互斥锁的头文件
void *func(); //线程函数声明
int count; 
int num1=0;
int num2=0;
int num3=0;
pthread_mutex_t mutex1;//互斥锁声明
int main()
{
    pthread_t thread1;//新建线程声明
    
    int ret= pthread_mutex_init(&mutex1,NULL);//初始化一个互斥锁
    if(ret<0)
    {
        perror("pthread_mutex_init");
        exit(-1);
    }
    if(0!=pthread_create(&thread1,NULL,func,NULL))//线程函数使用
    {
        perror("pthread_create");
        exit(-1);
    
    }
    while(1)
    {
        pthread_mutex_lock(&mutex1);//上锁
        num1 = count;
        num2 =count;
        count++;
        pthread_mutex_unlock(&mutex1);//解锁
    }
return 0;
}
void *func()//线程函数
{
    while(1)
    {
        pthread_mutex_lock(&mutex1);//上锁
        if(num1!=num2)//不相等不打印
        {
            printf("num1 =%d,num2=%d\n",num1,num2);
        }
        if(num1==num2)//相等打印
            printf("whhhhhhh");
    pthread_mutex_unlock(&mutex1);//解锁
    }
}