Part II $(50\%)$

Using the installed Linux operating system, write a C program that defines a global variable with

an initial value $($e$.$g$.,100).$ Your program should create three processes: one parent process and

two child processes.

The parent process will print the value of the global variable.

The first child process will increment the global variable and print its new value.

The second child process will decrement the global variable and print its new value.

Tasks:

Write a $C$ program as described above.

Discuss the order of the output from the parent and children processes.

Explain why the value of the global variable isn't affected by the increment$/$decrement

operations in other processes.

Use "Itrace" and "strace" with proper parameters to show the list of system calls and

library calls used by your program.

Discuss in detail the system calls used by your program.

Use top or htop to monitor and show real$-$time process information like CPU and memory

usage, and state during program execution. Discuss observations related to your program's

processes.

Use ps with appropriate options to show detailed information about processes running at the

time of execution. Analyze the output and discuss specific fields relevant to your program

$($e$.$g$.,$ Process ID$,$ Parent Process ID$,$ State$).$