Please answer all questions:

1- What is the difference between 'thread_exit()' and 'thread_destroy()'? Can a thread call thread_exit() on itself? Can it call thread_destroy() on itself? If not, why?

2- Question 12. What are the possible states that a thread can be in? When do zombie threads finally get cleaned up? How did you obtain your answer. Explain.

3- What function makes a thread to yield the CPU? When might you want to use this function?