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Warm Up Project: Multithreaded Programming and Synchronization
COP 5614 – Operating Systems
1. Summary
The warm up project is regarding several important topics on process management. We will do it
in user space using a widely-used threads programming interface, POSIX Threads (Pthreads). You
should implement this in Linux (such as Ubuntu 16.04), which supports Pthreads as part of the
GNU C library. And implement a loadable kernel module (LKM) to get the statistic information
about processes and threads.
You should submit the required deliverable materials to Canvas before 11:59pm, September 6,
2020 (Sunday).
2. Description
In this assignment, you will be working with the “threads” subsystem of Linux. This is the part of
Linux that supports multiple concurrent activities within the kernel. In the exercises below, you
will write a simple program that creates multiple threads to control the synchronization and fulfill
the requirement.
2.1 Environment Set Up
It’s recommendable to use Ubuntu as operating system to accomplish this project. Ubuntu is an
open source operating system software for computers. It is one of the distribution systems of Linux,
and is based on the Debian architecture. For those who don’t have Ubuntu installed in their
computers, it’s doable to use virtual machine (Virtual Box) and install the virtual Ubuntu in your
local operating system.
2.2 Multi-Thread Programming
Step 1: Write A Program to Finish Below Requirement
You are to write code to help synchronize a professor and his/her students during office hours. The
professor, of course, wants to take a nap if no students are around to ask questions; if there are
students who want to ask questions, they must synchronize with each other and with the professor
so that
(i) No more than a certain number of students can be in the office at the same time because
the office has limited capacity.
(ii) Only one person is speaking at a time.
(iii) Each student question is answered by the professor.
(iv) No student asks another question before the professor is done answering the previous
one.
(v) Once a student finishes asking all his/her questions, he/she must leave the office to
make room for other students waiting outside the professor’s office.
You are to provide the following functions:
Professor(). This functions starts a thread that runs a loop calling AnswerStart() and
AnswerDone(). See below for the specification of these two functions. AnswerStart() blocks
when there are no students around.
Student(int id). This function creates a thread that represents a new student with identifier
id that asks the professor one or more questions (the identifier given to your function can be
expected to be greater or equal to zero and the first student’s id is zero).
First, each student needs to enter the professor’s office by calling EnterOffice(). If the office
is already full, the student must wait. After a student enters the office, he/she loops running the
code QuestionStart() and QuestionDone() for the number of questions that he/she wants to ask.
The number of questions is determined by calculating (student identifier modulo 4 plus 1). That
is, each student can ask between 1 and 4 questions, depending on the id. For example, a student
with id 2 asks 3 questions, a student with id 11 asks 4 questions and a student with id 4 asks a
single question. Once the student has got the answer for all his/her questions, he/she must call
LeaveOffice(). As a result, another student waiting on EnterOffice() may be able to proceed.
AnswerStart(). The professor starts to answer a question of a student. Print …
Professor starts to answer question for student x.
AnswerDone(). The professor is done answering a question of a student. Print …
Professor is done with answer for student x.
EnterOffice(). It is the student’s turn to enter the professor’s office to ask questions. Print …
Student x enters the office.
LeaveOffice(). The student has no more questions to ask, so he/she leaves the professor’s
office. Print …
Student x leaves the office.
QuestionStart(). It is the turn of the student to ask his/her next question. Print …
Student x asks a question.
Wait to print out the message until it is really that student’s turn.
QuestionDone(). The student is satisfied with the answer to his most recent question. Print …
Student x is satisfied.
Since professor considers it rude for a student not to wait for an answer, QuestionDone() should
not print anything until the professor has finished answering the question.
A student can ask only one question each time. i.e., a student should not expect to ask all his/her
questions in a contiguous batch. In other words, once a student gets the answer to one of his/her
questions, he/she may have to wait for the next turn if another student starts to ask a question
before he/she does.
In the above list, x is a placeholder for the student identifier.
Your program must accept one command line parameter that represents the total number of
students coming to the professor’s office, and a second command line parameter that represents
the capacity of the professor’s office (i.e., how many students can be in the office at the same
time). For simplicity, you can assume that the Student threads are created at the ascending order
of their identifiers.
Your program must validate the command line parameters to make sure that they are numeric
values.
Your program must be able to run properly with any reasonable number of students (e.g., 200)
and room capacity (e.g., 8, 20, 50).
Your program must show randomness of events. For example, groups of students entering
office at various points in the simulation.
Your program must reach a completion state and terminate gracefully. A proper message
should be output to indicate end of simulation,
One acceptable output of your program is (assuming 3 students and a room capacity of 2):
Step 2: Use an LKM (loadable kernel module) To Get Process Information
In this step, you will write an LKM for the Linux kernel that displays the following details for the
Step 1’s process. You need to know how to install, remove and test the LKM. You also need to
find the related build in system files which are related to process and thread. Then use them to get
the process information.
The information includes:
(i) Process Name
(ii) Process ID
(iii) Parent Process ID
(iv) Number of Threads
Step 3: The Required Deliverable Materials
(1) A README file, which describes how we can compile and run your code.
(2) Your source code, must include a Makefile.
(3) Your report, which discusses the output of your program with the output screenshots.
3. Submission Requirements
You need to strictly follow the instructions listed below:
1) Submit a .zip file that contains all files. (source code files, MakeFile, README, report)
2) Do not submit your compiled binary code. We will compile and test your code.
3) Your code must be able to compile; otherwise, you will receive a grade of zero.
4) Your code should not produce anything else other than the required information in the output.
5) Your code must validate command line parameters to make sure the meaningful inputs.
6) If you code is partially completed, also explain in the report what has been completed and the
status of the missing parts.
7) Provide sufficient comments in your code to help the TA understand your code. This is
important for you to get at least partial credit in case your submitted code does not work properly.
4. Policies
1) Late submissions will be graded based on our policy discussed in the course syllabus.
2) Code-level discussion is prohibited. We will use anti-plagiarism tools to detect violations of
this policy.
5. Resources
The Pthreads tutorials at https://computing.llnl.gov/tutorials/pthreads and
http://pages.cs.wisc.edu/~travitch/pthreads_primer.html are good references to learn Pthreads
programming.
LKM online manual: http://tldp.org/HOWTO/Module-HOWTO/
6. References
[1] POSIX Threads Programming: https://computing.llnl.gov/tutorials/pthreads/
[2] Pthreads Primer: http://pages.cs.wisc.edu/~travitch/pthreads_primer.html
[3] POSIX thread (pthread) libraries:
http://www.yolinux.com/TUTORIALS/LinuxTutorialPosixThreads.html

 
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