Description
Write a C/C++ program that uses the PTHREAD library to
create 3 threads. The program must to the following:
* MAIN will open a file (hw5.out) for writing, then
call thread #1, thread #2 and thread #3. MAIN will
create a global variable (a single character) that
will be used to pass the characters from the threads
such that they can be written to hw5.out. MAIN will
write these characters to the hw5.out file (the threads
cannot do this). MAIN will also close hw5.out when
the threads are finished.
* THREAD #1 will open a file (hw5-1.in) for reading,
read 1 character value from the file, and put that
value in a global variable. Thread #1 will then wait
for thread #2 and #3 before reading the next value
in hw5-1.in.
* THREAD #2 will open a file (hw5-2.in) for reading,
read 1 character value from the file, and put that
value in a global variable. Thread #2 will then wait
for thread #3 and #1 before reading the next value
in hw5-2.in.
* THREAD #3 will open a file (hw5-3.in) for reading,
read 1 character value from the file, and put that
value in a global variable. Thread #3 will then wait
for thread #1 and #2 before reading next value in
hw5-3.in.
Obviously, you will need mutex(s) for this to work.
Notes:
1. When all of the data has been read, return control
to the MAIN routine.
2. The 3 input files will be the same size.
3. I suggest you use the command “fscanf(file,
“%c\n”, &value1)” to read the input files.
4. The format of hw5.out must be 1 character per line.
SAMPLE hw5-1:
————-
a
b
c
d
e
f
g
h
SAMPLE hw5-2:
————-
1
2
3
4
5
6
7
8
SAMPLE hw5-3:
————-
,
.
/
?
;
:
]
[
SAMPLE hw5-out
————–
a
1
,
b
2
.
REQUIREMENTS:
————-
1. Your program must compile and run on Linux Mint.
2. Your full name must appear as a comment at the beginning of your program.
3. Your source code must be named hw4-yourname.c or hw4-yourname.cpp
4. Your source MUST compile using “gcc hw4-yourname.c -pthread” or
“g++ hw4-yourname.cpp -lpthread”
5. Failure to follow the above 4 directions will result in
loss of points.
