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问题：编写程序完成如下功能：程序创建2个线程，然后：
        1> 主线程先打印“I am main thread”，然后睡眠2秒后，打印"main thread wake up",主线程退出
        2> 第一个新线程先打印“I am the first new thread”，然后睡眠3秒后，打印"the first new thread wake up"，退出
        3> 第二个新线程先打印“I am the second new thread”，然后睡眠5秒后，打印"the fsecond new thread wake up"，退出
    要求能看到所有打印信息

代码：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <unistd.h>
#include <pthread.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>void *fun1(){printf("I am the first new thread\n");sleep(3);printf("the first new thread wake up\n");return NULL;
}void *fun2(){printf("I am the second new thread\n");sleep(5);printf("the second new thread wake up\n");return NULL;
}int main(int argc,char *argv[]){pthread_t id[2];int ret = 0;ret = pthread_create(&id[0],NULL,fun1,NULL); // thread1ret += pthread_create(&id[1],NULL,fun2,NULL); // thread2if(ret){printf("pthread_create failed\n");return 1;}printf("I am main thread\n"); // main threadsleep(2);printf("main thread wake up\n");pthread_exit(NULL); // main thread exitpthread_join(id[0],NULL); // thread1 exitpthread_join(id[1],NULL); // thread2 exitreturn 0;
}

输出：