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ThinkerQAQOct 22 · 31 min read

Concurrency Programming (1.5): The Operating System Layer — Threads, Schedulers, and Runtime Scheduling

Table of Contents 0. From Language-Level Execution Units to the CPU 1. How Does Java Schedule Threads? 1.1 From Platform Threads to Virtual Threads 1.1.1 The Simplest Model: One Java Thread per OS Th

thinkerqaq.hashnode.dev

Ashwin MOct 21 · 8 min read

Your CPU Is Free. Your Kamailio Worker Isn't.

A Kamailio worker and an OS thread are easy to mix up, because for SIP they line up one to one. They are not the same idea. A worker is Kamailio's name for a process that handles one SIP message at a

ashwinm.hashnode.dev

saurabh daveJul 23 · 10 min read

eBPF vs Kprobes vs Uprobes vs Tracepoints: A Rigorous Observability Guide

Executive summary eBPF (extended BPF) offers a safe, in‑kernel virtual machine for custom tracing and monitoring code. It extends traditional probes with powerful data-collection features, minimal ov

saurabhdave.hashnode.dev

Darsh PatelJun 20 · 5 min read

Function Calls vs. System Calls (Without the Headache)

"You've written thousands of lines of code. But do you actually know what happens when your program wants to read a file, create a process, or talk to hardware?" If an interviewer asks you this, don't

darsh-patel.hashnode.dev

Dhawal PandyaJun 5 · 7 min read

How to go from http to https.

"Trust, but verify." Russian proverb The problem TLS was built to solve is simple and terrifying. The internet is a public network. When your browser makes a request to your bank, that request travel

dhawalpandya01.hashnode.dev

Dhawal PandyaJun 4 · 8 min read

The Lie Your OS Tells Every Program

"All problems in computer science can be solved by another level of indirection." David Wheeler If you run two programs right now, and both of them allocate memory at address 0x400000, they will not

dhawalpandya01.hashnode.dev

Lakshmi Sravanya ThirukandiyurMay 21 · 4 min read

My Linux Journey: From Windows to Ubuntu, Mint, and Finally Nobara

When I first heard about Linux, I honestly thought it was only for advanced programmers and hackers. I had always used Windows, so the Linux terminal, commands, and installation process looked very co

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Nikheel Vishwas SavantMay 6 · 54 min read

QuRT: The Real-Time OS Inside Your Phone's Processor [Full Handbook]

The Hexagon DSP in every Qualcomm-powered phone handles wake word detection, sensor processing, noise cancellation, and Bluetooth audio streaming – all while the main ARM CPU runs Android. The operati

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Dinesh SwamiApr 28 · 23 min read

----- Linux File System Hunting -----

Under the Hood of Linux: A Detective’s Journey Through the File System The “Everything is a File” Philosophy: Why It Matters Before we dive into the rabbit hole, let’s anchor ourselves. When Unix pion

linux-fs-hunt.hashnode.dev

Nishikanta RayApr 23 · 6 min read

File Descriptors (FD): What They Are, How They Work, and Why You Hit EMFILE

If you’ve ever seen an error like: EMFILE: too many open files you’ve already met one of the most fundamental pieces of an operating system: the file descriptor (FD). This blog explains: what an FD

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