What is a process in Operating Systems - Visual Explanation

Concept Flow - What is a process

Start Program

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Load Program into Memory

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Create Process

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Process Executes Instructions

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Process Uses CPU & Resources

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Process Completes or Waits

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Process Ends or Suspends

A process starts when a program is loaded into memory, then it runs instructions using CPU and resources until it finishes or waits.

Execution Sample

Operating Systems

1. Load program
2. Create process
3. Execute instructions
4. Use CPU
5. Finish or wait

This shows the steps from loading a program to running it as a process.

Analysis Table

Step	Action	Result	Process State
1	Load program into memory	Program code ready	Not running
2	Create process	Process created with ID	Ready
3	Execute instructions	CPU starts running process	Running
4	Process uses CPU and resources	Instructions processed	Running
5	Process waits for input	Process paused	Waiting
6	Process resumes	Continues execution	Running
7	Process completes	Process ends	Terminated

💡 Process ends after completing all instructions or is terminated.

State Tracker

Variable	Start	After Step 2	After Step 3	After Step 5	Final
Process State	None	Ready	Running	Waiting	Terminated
CPU Usage	0%	0%	High	0%	0%
Memory	Program loaded	Allocated	Used	Used	Freed

Key Insights - 2 Insights

Why is a process different from a program?

A program is just code on disk, but a process is the program running with its own state and resources, as shown in execution_table steps 1 and 2.

What happens when a process is waiting?

The process pauses and does not use CPU until it resumes, as seen in execution_table step 5 where state changes to Waiting.

Visual Quiz - 3 Questions

Look at the execution_table, what is the process state after step 3?

A Ready

B Running

C Waiting

D Terminated

💡 Hint

Check the 'Process State' column at step 3 in the execution_table.

At which step does the process stop using CPU temporarily?

A Step 5

B Step 4

C Step 2

D Step 7

💡 Hint

Look for the step where the process state changes to Waiting in the execution_table.

If the process never waits, which step would be skipped?

A Step 3

B Step 6

C Step 5

D Step 7

💡 Hint

Refer to the execution_table to see which step involves waiting.

Concept Snapshot

A process is a running instance of a program.
It starts when the program is loaded into memory.
The process uses CPU and resources to execute instructions.
It can be in states: Ready, Running, Waiting, or Terminated.
Processes end when they complete or are stopped.

Full Transcript

A process begins when a program is loaded into memory and a process is created. The process then runs instructions using the CPU and other resources. It can be in different states such as Ready, Running, Waiting, or Terminated. When waiting, the process pauses and does not use CPU until it resumes. Finally, the process ends when it completes all instructions or is terminated.