Process Control Block (PCB) in Operating Systems - Mini Project: Build & Apply

Understanding the Process Control Block (PCB)

📖 Scenario: You are learning how an operating system keeps track of running programs. Each program running on a computer is called a process. The operating system uses a special record called a Process Control Block (PCB) to store important information about each process.Imagine you are organizing a list of tasks you need to do, and for each task, you write down details like its name, status, and priority. The PCB works similarly for processes in a computer.

🎯 Goal: Build a simple representation of a Process Control Block (PCB) using a dictionary. You will create the PCB with key details, add a status variable, update the PCB with the status, and finally add a unique identifier to complete the PCB record.

📋 What You'll Learn

Create a dictionary named pcb with keys 'process_name', 'priority', and 'memory_address' with exact values.

Create a variable named process_status with the value 'Ready'.

Add the process_status variable to the pcb dictionary with the key 'status'.

Add a key 'pid' with the value 101 to the pcb dictionary to complete the PCB.

💡 Why This Matters

🌍 Real World

Operating systems use the Process Control Block to manage and switch between multiple running programs efficiently.

💼 Career

Understanding PCBs is essential for roles in system programming, operating system development, and IT infrastructure management.

1

Create the initial PCB dictionary

Create a dictionary called pcb with these exact entries: 'process_name': 'Calculator', 'priority': 5, and 'memory_address': '0x1A3F'.

Operating Systems

# Create the pcb dictionary with process_name, priority, and memory_address
# Your code here

Need a hint?

Use curly braces {} to create a dictionary. Include the keys and values exactly as shown.

2

Add the process status variable

Create a variable called process_status and set it to the string 'Ready'.

Operating Systems

pcb = {'process_name': 'Calculator', 'priority': 5, 'memory_address': '0x1A3F'}
# Create the process_status variable with value 'Ready'
# Your code here

Need a hint?

Assign the string 'Ready' to the variable process_status.

3

Add the status to the PCB dictionary

Add the process_status variable to the pcb dictionary with the key 'status'.

Operating Systems

pcb = {'process_name': 'Calculator', 'priority': 5, 'memory_address': '0x1A3F'}
process_status = 'Ready'
# Add process_status to pcb with key 'status'
# Your code here

Need a hint?

Use the key 'status' to add the process_status value to the pcb dictionary.

4

Add the process ID to complete the PCB

Add a key 'pid' with the value 101 to the pcb dictionary to complete the Process Control Block.

Operating Systems

pcb = {'process_name': 'Calculator', 'priority': 5, 'memory_address': '0x1A3F'}
process_status = 'Ready'
pcb['status'] = process_status
# Add 'pid' key with value 101 to pcb
# Your code here

Need a hint?

Assign the value 101 to the key 'pid' in the pcb dictionary.