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Operating System

For this project, you will build upon your interactive shell from project 2. You will add the ability to start programs and simulate their execution similar to what has been done in class.

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Operating Systems

Description

For this project, you will build upon your interactive shell from project 2.  You will add the ability to start programs and simulate their execution similar to what has been done in class.  The system will have a set amount of memory, a variable burst time, and uses a round-robin queue for keeping track of running processes. 

 

Commands the RUSH shell will implement for this project start - Add the program to the simulator step - Advance the system X units of time

setBurst - Set the amount of time a process gets on the CPU before being moved to the back of the queue

setMemory - Set the amount of memory available for the system  getMemory – Print out the amount of memory for the system

run – Advance the simulator until no jobs are left to run

addProgram *  

is

// Both are integers and pairs will be

 //  added in ascending order

This command adds a program to the filesystem in the current directory      timeTodoIO is relative to the process not the system time

 

Notes on simulation:

When a job goes to run, the system must have memory to support it otherwise it will not run. 

When a job asks for I/O, it must be removed from the queue until it finishes the I/O request. 

Once it is finished it will go to the back of the ready queue.

Whenever the current job is finished or leaves the queue, an updated system state should be printed out.

 

Output for the RUSH shell commands

The major commands for output are step and run.  Both should output the follow information.  This information can be presented in any way, but it should be easily understandable/readable. step or run should respond with the following:

Advancing the system for units or all jobs finished Current time

Running job has units left and is using   memory resources.

The queue is:

Position 1:  job has units left and is using   memory resources.

Position 2:  job has units left and is using   memory resources.

Finished jobs are:

     

Next burst time

Running job has units left and is using   memory resources.

The queue is:

Position 1:  job has units left and is using   memory resources.

Position 2:  job has units left and is using   memory resources.

Finished jobs are:

     

 

Sample usage scenario (on an empty binary file called sample.bin)

./RATCH sample.bin

EnterCommand>setMemory 3

EnterCommand>addProgram first 4 1 1 1

EnterCommand>addProgram second 4 1

EnterCommand>addProgram third 2 1 

EnterCommand>setBurst 4

EnterCommand>start first

EnterCommand>start second

EnterCommand>start third

EnterCommand>run 

Advancing the system until all jobs finished

Current time <0>

Running job first has 4 time left and is using 1 memory  resources.

The queue is:

Position 1:  job second has 4 units left and is using 1  memory resources.

Position 2:  job third has 2 units left and is using 1  memory resources.

Current time <1>

Running job second has 4 time left and is using 1  memory resources.

The queue is:

Position 2:  job third has 2 units left and is using 1  memory resources.

The process first is obtaining IO and will be back in 1 unit.

Current time <5>

Running job third, has 2 times left and is using 1 memory resources.

The queue is:

Position 1:  job first has 3 units left and is using 1 

memory resources. Finished jobs are:  second 4 5 

Current time <7>

Running job first has 3 times left and is using 1 memory resources.

The queue is:  empty Finished jobs are:     second 4 5        third 2 7

Current time <10>

Running job is empty

The queue is:  empty Finished jobs are:       second 4 5   third 2 7    first 4 10

 

Note:  your code must account for extraneous spaces or newlines.  If it does not handle these input cases, a grade deduction will be made.  Your program will be tested by inputting the commands listed earlier into a file, then redirected into your program via ./NAME < inputFile .  If your program does not work in this manner, you will not receive a passing grade on the project. 

 

Submission requirements:

Include all of your files in a directory name project with a Makefile that can build your program and produce the RATCH executable.

 

I use auto-grading on these assignments.  If your assignment does not follow them you will receive at most a 0 on the assignment.

 

Rubric

Submission requirements:  If not met, you receive a 0 for your submission.  Homework/Project 1/Project 2 should have provided feedback necessary to successfully submit this project. 

Runtime:  

To get a C on your submission it must take the input from the specification and produce the output from the specification (albeit it cannot be hardcoded).

To get a B on your submission it must produce correct output for at least ½ of the additional test cases I will use on your program. 

To get an A on your submission it must produce correct output for all of the additional test cases I will use on your program.

 

Design: 

Can lower your grade by one letter.  Deductions are made for choices such as all of your code in one function.  Use what you have learned from previous courses and you should have no issues with this deduction.

 

Comments:      

Can lower your grade by one letter if your submission doesn’t contain comments on:

Variables – purpose, type, scope

Function headers (purpose, parameters, return type, called by / calls)

 Explanation for blocks of code (inline comments)

Readme file for program containing name, what it is, how to use it.

Header for every source file containing purpose and functions / classes contained /  where to start looking.

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