---
title: "Discussion on \"Part 2: What \"Single-Threaded\" Actually Means\" | Hashnode"
description: "Discussion on \"Part 2: What \"Single-Threaded\" Actually Means\". A thread is a kernel data structure, not an active runner. The CPU is the agent. Here's what 'JavaScript is single-threaded' means mechanically."
url: "https://hashnode.com/posts/event-loop-single-threaded-actually-means/6a2f114c83a47c6fcbb2aa50"
---

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# [Part 2: What "Single-Threaded" Actually Means](https://srekaravarshan.hashnode.dev/event-loop-single-threaded-actually-means?utm_source=hashnode&utm_medium=feed)

A thread is a kernel data structure, not an active runner. The CPU is the agent. Here's what 'JavaScript is single-threaded' means mechanically.

Jun 14 · 27 min read · srekaravarshan.hashnode.dev  
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-   [#javascript](https://hashnode.com/tag/javascript)
-   [#operating-system](https://hashnode.com/tag/operating-system)
-   [#event-loop](https://hashnode.com/tag/event-loop)
-   [#threading](https://hashnode.com/tag/threading)
-   [#computer-science](https://hashnode.com/tag/computer-science)

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[Srekaravarshan N K](https://hashnode.com/@srekaravarshan)

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