Comp3511 Hw1 Solution - 1136 Words

Fall 2011 COMP 3511 Homework Assignment #1 Solution Handout Date: Sept. 22, 2011 Due Date: Oct. 6, 2011 Name: ______________ ID: ___________________ E-Mail: _____________ COMP 3511 L __ Please read the following instructions carefully before answering the questions: ï  ¬ You should finish the homework assignment individually. ï  ¬ There are a total of 4 questions. ï  ¬ When you write your answers, please try to be precise and concise. ï  ¬ Fill in your name, student ID, email and Section number at the top of each page. Submissions without this information will be discarded. ï  ¬ Please fill in your answers in the space provided, or you can type your answers in a Word file. ï  ¬ Homework Collection: the hardcopy is required and the homework is collected at†¦show more content†¦Briefly justify your answer with an example. Answer: Yes, for instance, a process in ready state must be placed on the ready queue. 4) (5 points) Why can not a process switch from waiting state to running state directly? Answer: The CPU could be busy, it must go through ready state waiting to be scheduled to run 5) (5 points) with only one thread is referred as a heavy-weight process, why is there no concurrency within the execution of such a process? Answer: Since there is only one â€Å"thread† of execution and instructions can only be executed sequentially. 4. (32 points) Thread 1) (8 points) What are the two components of program states that are shared by all threads within a process? What are the two components that are dedicated to each thread? Answer: The threads of a multithreaded process share heap memory and global variables. Each thread has its separate set of register values and a separate stack. 2) (4 points) A multi-thread process and multiple processes can both provide concurrency, what is the major benefit of using a multi-thread process? Answer: Threads within a single process shares code and data, the context switch between threads is much simpler 3) (8 points) What resources are used when a thread is created? How do they differ from those used when a process is created? Answer: Creating either a user or kernel thread involves allocating a small data structure to hold a register set, stack, and priority. (4 points) Because a thread is