/*
* Author @Vnu
*/



Please Refer Project 1 specifications for details.



The list of files
_____________________________________________________________________________________________________________________________

1) MyCompress.c     	:   DESCRIPTION	:	Program takes two arguments from the command line <Input File> <Output File>
 * 			Opens the Input File and creates the Output File using System call 'open'
 * 			Passes the File Descriptors for the input and the output file to the Compression Function
 *
 * EXECUTION		:	./MyCompress <Input File> <Output File>

2) MyDecompress.c   	:   DESCRIPTION	:	Program takes two arguments from the command line <Input File> <Output File>
 * 			Opens the Input File and creates the Output File using System call 'open'
 * 			Passes the File Descriptors for the input and the output file to the Decompression Function
 *
 * EXECUTION		:	./MyDecompress <Input File> <Output File>

3) ForkCompress.c   	:   DESCRIPTION	:	Program takes two arguments from the command line <Input File> <Output File>
 * 			It forks a child process.
 * 			Using execlp, it calls the MyCompress.c program to Compress the Input File and writes to Output File
 *
 * EXECUTION		:	./ForkCompress <Input File> <Output File>

4)PipeCompress.c    	:   DESCRIPTION	:	Program takes two arguments from the command line <Input File> <Output File>
 * 			It forks two child process and both child communicate through a pipe.
 * 			The first child, reads from the input file, compresses it and writes to the pipe
 * 			The second child reads from the pipe and writes to the output file.
 *
 * EXECUTION		:	./PipeCompress <Input File> <Output File>

5)ParFork.c         	:   DESCRIPTION	:	Program takes two arguments from the command line <Input File> <Output File>
 * 			It forks maximum of 30 child process each child process compress and writes a segment of the input file.
 * 			If the Fork processes reaches 30, it waits for the children to complete and then forks again.
 * 			The Segment is made for every newline character or white space.
 *
 * EXECUTION		:	./ParFork <Input File> <Output File>

6)MiniShell.c   	:   DESCRIPTION	:	Program Forks a child to execute argument less commands like a UNIX Shell.
 * 			It forks a child process.
 * 			Using execlp, it executes the command array to run the given shell command
 *
 * EXECUTION		:	./MiniShell

7)MoreShell.c      	 :  DESCRIPTION	:	Program Forks a child to execute commands with arguments like a UNIX Shell.
 * 			It forks child processes for every input to the MoreShell>.
 * 			Using execlp, it executes the command array to run the given shell command
 *
 * EXECUTION		:	./MoreShell

8)DupShell.c        	:  DESCRIPTION	:	Program Forks a child to execute commands with arguments like a UNIX Shell.
 * 			It forks child processes for every input to the MoreShell>.
 * 			Using execlp, it executes the command array to run the given shell command
 *
 * EXECUTION		:	./DupShell

9)ParThread.c       	:  DESCRIPTION	:	Program takes two arguments from the command line <Input File> <Output File>
 * 			It creates threads that compresses and writes a segment of the input file to the output file.
 * 			The Segment is made for every newline character or white space.
 *
 * EXECUTION		:	./ParThread <Input File> <Output File>

10) osheaders.h  	: It contains all the #include files needed for programs
 
11) makefile        	: It generates all the executables

12) Prj1SCRIPT      	: Sample output of all programs

13) Prj1README      	: List of files



PROBLEM #10

The execution time for 
1. Sequential version                  : 0.539674 secs
2. Fork version (max 30 concurrent)    : 0.636738 secs
3. Thread version (max 100 concurrent) : 0.627041 secs
From these timings we see that sequential version of compressing is the fastest followed by thread version and then forked version.
Forked version is the slowest. And the thread version will be the fastest for larger file. This is because, fork creates a seperate
address space. Thread uses a shared address space.