Linux 下的多线程编程（1）

#include<stdio.h>
#include<pthread.h>
#include<string.h>
#include<sys/time.h>
#define MAX 20
//定义三个线程共同完成计数任务
pthread_t thread[3];
pthread_mutex_t mut;//定义互斥锁变量
int num=0;
int i;

void *thread1(){
    printf("thread1:im thread 1");
    for(i=0;i<MAX;i++){
        printf("thread1:num=%d \n",num);
        pthread_mutex_lock(&mut);
            num++;
        pthread_mutex_unlock(&mut);
        sleep(2);
    }
    pthread_exit(NULL);
}
void *thread2(){
    printf("thread1:im thread 1");
    for(i=0;i<MAX;i++){
        printf("thread1:num=%d \n",num);
        pthread_mutex_lock(&mut);
            num++;
        pthread_mutex_unlock(&mut);
        sleep(2);
    }
    pthread_exit(NULL);
}
void *thread3(){
    printf("thread1:im thread 1");
    for(i=0;i<MAX;i++){
        printf("thread1:num=%d \n",num);
        pthread_mutex_lock(&mut);
            num++;
        pthread_mutex_unlock(&mut);
        sleep(2);
    }
    pthread_exit(NULL);
}
void main(){
    pthread_mutex_init(&mut,NULL);//使用默认属性来初始化互斥锁
    pthread_create(&thread[0],NULL,thread1,NULL);//创建线程并没有运行
    pthread_create(&thread[1],NULL,thread1,NULL);
    pthread_create(&thread[2],NULL,thread1,NULL);
    pthread_join(thread[0],NULL);//把线程1加入等待开始执行
    pthread_join(thread[1],NULL);
    pthread_join(thread[2],NULL);
}