/JavaThreadModel

Primary LanguageJava

Java Threading Model

Welcome to the comprehensive guide to Java's threading model. This repository covers everything from basic thread lifecycles to advanced concurrency utilities and the latest in virtual threads.

Table of Contents

Introduction

This repository is designed to provide a comprehensive understanding of Java's threading model. It includes examples and explanations of thread states, concurrency utilities, and the new virtual threads introduced in Java.

Fundamental Computer Hardware Resources

  • CPU
  • Memory
  • Disk/SSD
  • Network
  • Software Critical Section

Sources of Overhead in a Concurrent System

  • Monitors (i.e., locks and condition variables)
  • Number of context switches
  • Number of threads
  • Scheduling
  • Locality of memory
  • Algorithm design

Repository Structure

ThreadLifecycles

This folder contains examples demonstrating the various states of a thread in Java. The states covered include:

  • New: A thread that has been created but not yet started.
  • Runnable: A thread that is ready to run but waiting for CPU time.
  • Blocked: A thread that is blocked waiting for a monitor lock.
  • Waiting: A thread that is waiting indefinitely for another thread to perform a particular action.
  • Timed Waiting: A thread that is waiting for another thread to perform an action for up to a specified waiting time.
  • Terminated: A thread that has exited.

Files:

  • NewThread.java
  • RunnableThread.java
  • BlockedThread.java
  • WaitingThread.java
  • TimedWaitingThread.java
  • TerminatedThread.java
  • Main.java

Concurrency

This folder contains examples and utilities for managing concurrency in Java.

ThreadPool

This subfolder demonstrates the use of thread pools in Java, including the ThreadPoolExecutor and custom thread factories.

Files:

  • SimpleThreadPoolExecutor.java

VirtualThreads

This folder explores the new virtual threads introduced in Java, providing examples and use cases for lightweight concurrency.

Files:

  • VirtualThreadExample.java

Future Enhancements

Because this GitHub repo is meant to be comprehensive, the following folders and examples will eventually be added:

  • Locks and Synchronization: Examples demonstrating the use of synchronized blocks, locks, and other synchronization primitives.
  • Executor Framework: Examples showcasing the different types of executors provided by the java.util.concurrent package.
  • Fork/Join Framework: Examples of parallelism using the Fork/Join framework.
  • Reactive Streams: Examples of using reactive programming and streams for asynchronous programming.
  • Best Practices: Tips and best practices for writing efficient and safe multithreaded code.

Contributing

Contributions are welcome! Please fork the repository and create a pull request with your additions or improvements.

License

This repository is licensed under the MIT License.