CS476/576

Assignment #3

Due Midnight, Wednesday   Nov 2 , 2005

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Write a C/UNIX program with the following descriptions:

NAME

ccpp - A  set of Cooperative Concurrent Pipe-connected Processes.

SYNOPSIS

ccpp n

DESCRIPTION

The program creates n processes and each process is connected to its neighbor process with two pipes, one for read and the write. Note that the first and last processes have only one neighbor, i.e. the set of processes forms a chain.  Here is a description of the processes functions:

• Each process  K, K= 1, 2, n reads a line from /dev/tty
• Saves the line in a file called processK
• Forwards  the line  it to its neighbor(s)
• Signals its  two neighbor(s) to read the line.
• Sleeps a random amount of time T, where T < 10n seconds and then goes back to read from /dev/tty.

When a process K receives a line from one of its neighbors it perform the following functions:

• Saves the line in its own file processK
• Forwards the line to next neighbor and signals it to read the line.
• Goes back to read from /dev/tty.

When a user types CTRL-D all processes are terminated.

See my own solution under:

/home/cs476/public_html/fall05/assignments/a3/wahab