Linux编程实践----第一个多线程程序

#include<iostream>#include<sys/types.h>#include<stdlib.h>#include<pthread.h>#include<unistd.h>#include<string.h>using namespace std;int num=0;void *thread_function1(void *arg){        cout<<"Thread 1 is running! The global variable is "<<*((int *)arg)<<endl;        cout<<"Let thread 1 change it to 1"<<endl;        *((int *)arg)=1;}int main(){        cout<<"Main thread is running.The global variable is "<<num<<endl;        pthread_t thread;        int id;        id=pthread_create(&thread,NULL,thread_function1,(void *)(&num));        if(0!=id)        {                cout<<"Thread creation failed!"<<endl;                exit(EXIT_FAILURE);        }        sleep(10);        cout<<"Main thread is going on! The global ivariable is "<<num<<endl;        exit(0);}

1.编译时首先定义宏_REENTRANT。程序只是为了验证功能，不能作为最后的产品代码。此测试程序也没有一定的命名规范，Just for learning!

2.执行结果为：