CS475 Program 0

Write a C program using light-weight threads  with  three  light-
weight processes.  These will be referred to as R (the reader), F
(the filling processing) and W (the writer).  Process R will read
lines from standard input and copy them to named pipe P1. Process
F will read lines from named pipe P1.  The input will  be  words,
one  word  per  line.   The  filler  will build an output line by
filling each of the words to the  end  of  a  buffer  line  until
adding a new word would cause there to be more than 70 characters
in the line. The line would then be written to  F's  output,  and
the  buffer  set to the next word.  F's output will be written to
named pipe P2. Process W will read lines from named pipe  P2  and
copy lines to standard output.

Processes R, F  and  W  will  treat  a  line  starting  with  the
character "$" as an EOF (end-of-file) indication.

Each of R, F and W will have trace messages that list  each  line
read and written by that process.  i.e.:

      process F read line-->a
      process F wrote line -->a

These trace lines are to be turned on by including a line

 #define TraceMsg

          !-----!   P1     !-----!    P2     !-----!
--------->!  R  !--------->!  F  !---------->!  W  !---------->
standard  !-----!          !-----!           !-----!  standard
input                                                 output

RULES: This first program is to be written by individuals.  After
this  program  you  are  to  form  groups,  and  the  rest of the
programming project will be done as part of a group.

The light-weight threads are available only on plains and the new
SUN cluster.  We will be using the SUN cluster.  You will need to
get an account number just for the cluster.