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Operating Systems One-month project

Objectives:

  • Learn to work with Nachos networking for communication among processes.
  • Define and implement a “chat” protocol for interaction between a chat server and a chat client.

Problem statement:

Chat rooms have become a popular way to support a forum for n-way conversation or discussion among a set of people with interest in a common topic. Chat applications range from simple, text-based ones to entire virtual worlds with exotic graphics. In this project you are required to implement a simple text-based chat client/server application.

Problem description:

Email, newsgroup and messaging applications provide means for communication among people but these are one-way mechanisms and they do not provide an easy way to carry on a real-time conversation or discussion with people involved. Chat room extends the one-way messaging concept to accommodate multi-way communication among a set of people.

Nachos networking infrastructure

Nachos networking packages implements a very simple Unix domain (not internet domain), datagram socket. The files of importance to this project and their purpose are described below.

threads directory:

lockcond.h, lockcond.cc: for defining and implementing lock and condition synchronization primitives; needed for network applications to work.

machine directory:

network.h, network.cc: Data structures to emulate a physical network connection. The network provides the abstraction of ordered, unreliable, fixed-size packet delivery to other machines on the network.You may note that the interface to the network is similar to the console device -- both are full duplex channels.

sysdep.h, sysdep.cc : Interprocess communication operations, for simulating the network; Unix sockets creation, binding, closing etc. are called here to provide nachos socket functionality.

network directory:

post.h, post.cc: postoffice and mailbox, mail message definition and implementation.

nettest.cc: application to test communication between host id 0 and host id 1 (these are hardcoded!)

Chat architecture:

A chat application consists of a Chat Client (CC) one per person, a Chat Server (CS) and a two-way communication pipeline between the client and the server to send and receive conversational, control and status messages.

  • Chat Client:

Typical features of a CC include: (i) select chat server (server id), (ii) select a nickname for interaction and (iii) ability to set and change user preferences such as number of messages displayed, change nickname, etc. You may design your own chat user interface.

Implementation notes:

The server id is specified at command line (nachos –rs 1234 –m selfid –o serverid ) while executing the nachos process representing the client.

Once the client process is running it could interactively ask the user for the nickname of the chat user and update this information locally and if needed by your design on the server.

  • Chat Server:

A chat server supports the set of clients for a room, by maintaining client handle (clientid in nachos –rs –m clientId –o serverid), and client name. Server also has a message interpreter that parses the message received from a client and delegates the command to the appropriate module. Sample architecture for the chat application is shown in Figure 2. You may change the architecture to suit your design.

Questions & Answers

where we get a research paper on Nano chemistry....?
Maira Reply
nanopartical of organic/inorganic / physical chemistry , pdf / thesis / review
Ali
what are the products of Nano chemistry?
Maira Reply
There are lots of products of nano chemistry... Like nano coatings.....carbon fiber.. And lots of others..
learn
Even nanotechnology is pretty much all about chemistry... Its the chemistry on quantum or atomic level
learn
Google
da
no nanotechnology is also a part of physics and maths it requires angle formulas and some pressure regarding concepts
Bhagvanji
hey
Giriraj
Preparation and Applications of Nanomaterial for Drug Delivery
Hafiz Reply
revolt
da
Application of nanotechnology in medicine
what is variations in raman spectra for nanomaterials
Jyoti Reply
ya I also want to know the raman spectra
Bhagvanji
I only see partial conversation and what's the question here!
Crow Reply
what about nanotechnology for water purification
RAW Reply
please someone correct me if I'm wrong but I think one can use nanoparticles, specially silver nanoparticles for water treatment.
Damian
yes that's correct
Professor
I think
Professor
Nasa has use it in the 60's, copper as water purification in the moon travel.
Alexandre
nanocopper obvius
Alexandre
what is the stm
Brian Reply
is there industrial application of fullrenes. What is the method to prepare fullrene on large scale.?
Rafiq
industrial application...? mmm I think on the medical side as drug carrier, but you should go deeper on your research, I may be wrong
Damian
How we are making nano material?
LITNING Reply
what is a peer
LITNING Reply
What is meant by 'nano scale'?
LITNING Reply
What is STMs full form?
LITNING
scanning tunneling microscope
Sahil
how nano science is used for hydrophobicity
Santosh
Do u think that Graphene and Fullrene fiber can be used to make Air Plane body structure the lightest and strongest. Rafiq
Rafiq
what is differents between GO and RGO?
Mahi
what is simplest way to understand the applications of nano robots used to detect the cancer affected cell of human body.? How this robot is carried to required site of body cell.? what will be the carrier material and how can be detected that correct delivery of drug is done Rafiq
Rafiq
if virus is killing to make ARTIFICIAL DNA OF GRAPHENE FOR KILLED THE VIRUS .THIS IS OUR ASSUMPTION
Anam
analytical skills graphene is prepared to kill any type viruses .
Anam
Any one who tell me about Preparation and application of Nanomaterial for drug Delivery
Hafiz
what is Nano technology ?
Bob Reply
write examples of Nano molecule?
Bob
The nanotechnology is as new science, to scale nanometric
brayan
nanotechnology is the study, desing, synthesis, manipulation and application of materials and functional systems through control of matter at nanoscale
Damian
Is there any normative that regulates the use of silver nanoparticles?
Damian Reply
what king of growth are you checking .?
Renato
What fields keep nano created devices from performing or assimulating ? Magnetic fields ? Are do they assimilate ?
Stoney Reply
why we need to study biomolecules, molecular biology in nanotechnology?
Adin Reply
?
Kyle
yes I'm doing my masters in nanotechnology, we are being studying all these domains as well..
Adin
why?
Adin
what school?
Kyle
biomolecules are e building blocks of every organics and inorganic materials.
Joe
how did you get the value of 2000N.What calculations are needed to arrive at it
Smarajit Reply
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Source:  OpenStax, Operating systems. OpenStax CNX. Aug 13, 2009 Download for free at http://cnx.org/content/col10785/1.2
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