Function second_thread

lab5/src/4/src/kernel/setup.cpp:20–22

    }
}
void second_thread(void *arg) {
    printf("pid %d name \"%s\": Hello World!\n", programManager.running->pid, programManager.running->name);
}
void first_thread(void *arg)
{
    // 第1个线程不可以返回