{"id":3291,"date":"2025-06-06T14:12:05","date_gmt":"2025-06-06T14:12:05","guid":{"rendered":"https:\/\/diznr.com\/?p=3291"},"modified":"2025-06-06T14:12:05","modified_gmt":"2025-06-06T14:12:05","slug":"day-01part-14-operating-system-for-computer-concept-of-process-control-block-in-very-way-easy","status":"publish","type":"post","link":"https:\/\/www.reilsolar.com\/pdf\/day-01part-14-operating-system-for-computer-concept-of-process-control-block-in-very-way-easy\/","title":{"rendered":"Day 01Part 14 – Operating system for computer – Concept of process Control Block in very easy way"},"content":{"rendered":"

Day 01Part 14 – Operating system for computer – Concept of process Control Block in very easy way<\/p>\n

[fvplayer id=”338″]<\/p>\n

\u00a0Process Control Block (PCB) – Explained in an Easy Way<\/strong><\/h3>\n

When you run any program on a computer, the operating system (OS)<\/strong> manages it as a process<\/strong>. To track and manage each process efficiently, the OS maintains a Process Control Block (PCB)<\/strong>.<\/p>\n

\u00a0What is a Process Control Block (PCB)?<\/strong><\/h3>\n

PCB is a data structure<\/strong> used by the Operating System<\/strong> to store information<\/strong> about a process. It keeps all details needed for process execution and management.<\/p>\n

Think of PCB like an Identity Card<\/strong>\u00a0 for a process, which contains all important details about it.<\/p>\n

\u00a0Information Stored in PCB<\/strong><\/h3>\n

A PCB contains the following essential details:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Component<\/strong><\/th>\nDescription<\/strong><\/th>\n<\/tr>\n<\/thead>\n
\u00a0Process ID (PID)<\/strong><\/td>\nUnique identification number for each process.<\/td>\n<\/tr>\n
\u00a0Process State<\/strong><\/td>\nThe current state of the process (New, Ready, Running, Waiting, Terminated).<\/td>\n<\/tr>\n
\u00a0Program Counter (PC)<\/strong><\/td>\nThe memory address of the next instruction to be executed.<\/td>\n<\/tr>\n
\u00a0CPU Registers<\/strong><\/td>\nStores CPU-related data (like accumulator, index registers, etc.).<\/td>\n<\/tr>\n
\u00a0Memory Management Info<\/strong><\/td>\nDetails about memory allocation (base and limit registers, page tables).<\/td>\n<\/tr>\n
\u00a0I\/O Information<\/strong><\/td>\nList of input\/output devices assigned to the process.<\/td>\n<\/tr>\n
\u00a0Scheduling Information<\/strong><\/td>\nPriority, scheduling queue details.<\/td>\n<\/tr>\n
\u00a0Accounting Information<\/strong><\/td>\nCPU time used, process creation time, etc.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u00a0How PCB Works?<\/strong><\/h3>\n

When a process starts<\/strong>, the OS creates a PCB for it.
When the process runs<\/strong>, the CPU uses PCB data for execution.
If the process is paused or waiting<\/strong>, its PCB keeps track of its state.
When the process finishes<\/strong>, the OS deletes its PCB.<\/p>\n

\u00a0Process States and PCB<\/strong><\/h3>\n

A process moves through different states, and the PCB updates its Process State<\/strong> accordingly.<\/p>\n

New<\/strong> \u2192 Process is being created.
Ready<\/strong> \u2192 Waiting to get CPU time.
Running<\/strong> \u2192 Executing instructions.
Waiting<\/strong> \u2192 Waiting for input\/output operation.
Terminated<\/strong> \u2192 Process has finished execution.<\/p>\n

\u00a0Why is PCB Important?<\/strong><\/h3>\n

\u00a0Helps the OS manage multiple processes efficiently.
\u00a0Saves the state of a process during context switching<\/strong>.
\u00a0Stores critical information for process scheduling.<\/p>\n

\u00a0Simple Example to Understand PCB<\/strong><\/h3>\n

Imagine a to-do list<\/strong>\u00a0 where each task has:<\/p>\n