CSE531 Project 2B
Due date: Dec 9th or 10th (at time of demo)

Administrivia

Project 2B is the final project of the semester. You are required to demonstrate that your code works. A demo schedule will be set up and made available for sign up soon. The demo dates will be: Dec 9th and Dec 10th.

Problem:

Write a 2-machine message passing system, with asynchronous messages. Ports exist on both machines.

Specifics:

There are two machines, with ids 0 and 1.  

• Each machine has 20 ports (5 message buffer per port). 
• The ports on machine 0 are numbered 0..19 and ports on machine 1 are numbered 100..119. 
• A process can send and receive messages from any port regardless of where the process is running.

Implementation Details:

The solution involves (of course) writing and running a network message server on each machine. Then applications on any machine can communicate from/to any port.

• Use the library implemented in Project 2A for local messaging.
• On each machine reserve port 0..9 for actual communication, and 10..19 for proxy ports.
• The implementation consists of the communication library (project 1 and project 2A) and two (identical) network message servers, one for each machine. The implementation of mysend and myrecv is modified to recognize local and remote ports. The library of course has to be aware which machine the calling program is running on (use a global id).
• To run a process on Machine 0 you must do:  Initialize(0) 
• To run a process on Machine 1 you must do: Initialize(1) 
• To send a message to net-msg-server on Machine 0  you do: net_snd_msg (0, mesg, size) // similar for Machine 1
• The net-msg-server on machine 0 receives the above message using: net_rcv_msg (0, mesg, maxsize) // similar for Machine 1

The 531.h (same as os.h) file has been updated with new features, such as net-msg send/receive. In addition an alternate implementation of semaphores are available using InitSem1(), P1() and V1(). You may use either the old implementation or the new implementation.

Testing:

Same as project 1 -- except ensure that senders and receivers are on different "machines".

Software:

An updated version of 531.zip is now available at 531-v2.tar  (UPDATED AGAIN)