📊 ConcurrentSystemStats

ConcurrentSystemStats (main executable: mySystemStats) is a real-time, terminal-based system monitoring utility. It reports live system metrics like CPU usage, memory consumption, and active user sessions — all while showcasing concurrent programming using multiple child processes and inter-process communication (IPC).

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🔍 Overview

ConcurrentSystemStats captures system health data using a multi-process architecture. Each major system metric is collected by a dedicated child process, allowing parallel, non-blocking data gathering. A parent process aggregates and renders the data in an organized and user-friendly format.

Features include:

• Real-time updates
• Graphics (bars) for CPU and memory usage
• Graceful exit on Ctrl-C
• Terminal-clearing for clean refresh

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🧠 Design Approach

🧵 Concurrent Data Collection

Each system component (CPU, memory, user sessions) is handled by an individual child process to enable simultaneous collection.

🔄 Inter-Process Communication (IPC)

Child processes use pipes to send data to the parent, allowing the parent process to coordinate output.

🛑 Robust Signal Handling

Custom signal handlers:

• Intercept SIGINT (Ctrl-C) for controlled termination
• Ignore SIGTSTP (Ctrl-Z) to avoid suspending the program

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⚙️ Core Components

🔧 Child Process Functions

Function	Description
storeMemArr(int samples, int memFD[2], int tdelay);	Collects memory usage and writes to a pipe
storeUserInfoThird(int userFD[2], int ucountFD[2]);	Gathers user session data and count
storeCpuArr(int cpuFD[2]);	Reads CPU statistics from /proc/stat and writes to a pipe

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🖥️ Parent Process Functions

Function	Description
fcnForPrintMemoryArr(...)	Displays memory info using the received pipe data
printUserInfoThird(...)	Reads and prints user session data

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🧩 Signal Handling

void signal_handler(int signal);

• SIGINT (Ctrl-C):
  • Asks user whether to quit
  • If yes, terminates all child processes and exits cleanly
• SIGTSTP (Ctrl-Z):
  • Ignored to prevent suspending the process

signal(SIGTSTP, SIG_IGN); // Prevent Ctrl-Z from suspending the program