250+ TOP MCQs on Posix Threads and Answers

Linux Debugging questions and answers focuses on Posix Threads.1. Which one of the following string will print first by this program?

```
   #include
```
```
   #include
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       printf("n");
```
```
       pthread_exit("Bye");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       printf("Linuxn");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       return 0;
```
```
   }
```

a) Linux
b)
c) it can not be predicted
d) none of the mentioned

Answer: b

2. What is the output of this program?

```
   #include
```
```
   #include
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       int ret;
```
```
       ret = pthread_exit("Bye");
```
```
       printf("%dn",ret);
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       return 0;
```
```
   }
```

a) 0
b) 1
c) -1
d) none of the mentioned

Answer: d

3. What is the output of this program?

```
   #include
```
```
   #include
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       printf("n");
```
```
       pthread_exit("Bye");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       return 0;
```
```
   }
```

a) this program will print the string “”
b) this program will print nothing
c) segmentation fault
d) run time error

Answer: b

4. What is the output of this program?

```
   #include
```
```
   #include
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       printf("%dn",a);
```
```
       pthread_exit("Bye");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       int a;
```
```
       pthread_t pt;
```
```
       void *res_t;
```
```
       a = 10;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       return 0;
```
```
   }
```

a) 10
b) 0
c) -1
d) none of the mentioned

Answer: d

5. What is the output of this program?

```
   #include
```
```
   #include
```
```
   int a;
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       printf("%dn",a);
```
```
       pthread_exit("Bye");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```
```
       a = 10;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       return 0;
```
```
   }
```

a) 10
b) 0
c) -1
d) none of the mentioned

Answer: a

6. What is the output of this program?

```
   #include
```
```
   #include
```
```
   int a;
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       a = 20;
```
```
       pthread_exit("Bye");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```
```
       a = 10;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       printf("%dn",a);
```
```
       return 0;
```
```
   }
```

a) 10
b) 20
c) segmentation fault
d) none of the mentioned

Answer: b

7. Which one of the following statement is not true about this program?

```
   #include
```
```
   #include
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       printf("%dn",getpid());
```
```
       pthread_exit("Bye");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       printf("%dn",getpid());
```
```
       return 0;
```
```
   }
```

a) both printf statements will print the same value
b) both printf statements will print the different values
c) this program will print nothing
d) none of the mentioned

Answer: a

8. What is the output of this program?

```
   #include
```
```
   #include
```
```
   #include
```
```
   int fd;
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       char buff[10];
```
```
       int count;
```
```
       count = read(fd,buff,10);
```
```
       printf("%dn",count);
```
```
       pthread_exit("Bye");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```
```
       fd = open("san.c",O_RDONLY);
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       return 0;
```
```
   }
```

a) 10
b) 0
c) -1
d) segmentation fault

Answer: a

9. What is the output of this program?

```
   #include
```
```
   #include
```
```
   #include
```
```
   void *fun_t(void *arg);
```
```
   void *fun_t(void *arg)
```
```
   {
```
```
       pthread_exit("Bye");
```
```
       printf("n");
```
```
   }
```
```
   int main()
```
```
   {
```
```
       pthread_t pt;
```
```
       void *res_t;
```

       if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
           perror("pthread_create");
```
```
       if(pthread_join(pt,&res_t) != 0)
```
```
           perror("pthread_join");
```
```
       printf("%sn",res_t);
```
```
       return 0;
```
```
   }
```

a)
b) Bye
c) segementation fault
d) run time error

Answer: b

10. What is the output of this program?

```
    #include
```
```
    #include
```
```
    void *fun_t(void *arg);
```
```
    void *fun_t(void *arg)
```
```
    {
```
```
        sleep(1);
```
```
    }
```
```
    int main()
```
```
    {
```
```
        pthread_t pt;
```
```
        void *res_t;
```

        if(pthread_create(&pt,NULL,fun_t,NULL) != 0)

```
            perror("pthread_create");
```

        if(pthread_join(pt,&res_t) != 0)

```
            perror("pthread_join");
```
```
        printf("%sn",res_t);
```
```
        return 0;
```
```
    }
```

a) this process will pause
b) segmentation fault
c) run time error
d) none of the mentioned

Answer: b

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250+ TOP MCQs on Posix Threads and Answers

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