Engineering Atlas by Abhishek Goyal

Backend · Sub-topic

Concurrency

Threads, pools and the JVM concurrency toolkit behind every request.

  1. Guide

    Java Concurrency & Multithreading

    End-to-end, internals-first: JVM memory architecture, CPU cache visibility, all six thread states, synchronized and volatile, wait/notify, thread pools, the full java.util.concurrent toolkit, ThreadLocal, CompletableFuture, the Java Memory Model, common bugs, and a full interview Q&A.

    ~50 min read · Beginner → Advanced · 8 diagrams

  2. Deep diveNew

    Why wait() and notify() Must Be Called Inside synchronized

    The lost-wakeup race that forces the rule, what the monitor’s entry set and wait set really do, why wait() must live in a while loop, notify vs notifyAll — and how Lock/Condition inherits the same contract.

    ~32 min read · Intermediate · 7 diagrams

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