The causes of deadlock and two things you can do about it. This video also covers how to write a method that can safely acquire any number of locks in any order without causing deadlock, using the tryLock() method of … Continue reading →

How to use the ReentrantLock class in Java as an alternative to synchronized code blocks. ReentrantLocks let you do all the stuff that you can do with synchronized, wait and notify, plus some more stuff besides that may come in … Continue reading →

In this tutorial we’ll look at how to implement the producer-consumer pattern using “low level” techniques; namely, wait, notify and synchronized. This isn’t the best way to implement a producer-consumer pattern in Java (see tutorial 7 for the best way); … Continue reading →

A tutorial on wait and notify in Java; low-level multithreading methods of the Object class that allow you to have one or more threads sleeping, only to be woken up by other threads at the right moment. Extremely useful for … Continue reading →

A tutorial on how to implement the producer-consumer pattern in Java using the ArrayBlockingQueue Java class. Producer-Consumer is the situation where one or more threads are producing data items and adding them to a shared data store of some kind … Continue reading →

A video tutorial on using the excellent CountDownLatch Java class to synchronize your threads’ activities. After starting the video, click the maximise button to make it fullscreen so you can see the code! Code For This Tutorial import java.util.concurrent.CountDownLatch; import … Continue reading →

A tutorial on how to manage multiple threads in Java using thread pools. With thread pools you can assign a whole gaggle of threads to work through your queue of tasks. After starting the video, click the maximise button to … Continue reading →

This is the fourth part of our advanced Java multi-threading tutorial. In this tutorial I show you how you can use multiple locks to speed up complex multi-threaded code, sometimes dramatically. After starting the video, click the maximise button to … Continue reading →

This is the third part of our advanced Java multi-threading tutorial. In this tutorial we look at using the synchronized keyword to coordinate actions between threads and prevent them screwing up each other’s work. After starting the video, click the … Continue reading →

The second part of the advanced Java multi-threading tutorial. In this tutorial we look at using the volatile keyword to communicate between threads using flags. We also look at why the potential uses of volatile are somewhat limited. After starting … Continue reading →

Does multithreading seem like a black art to you? This is the first part of an advanced Java tutorial on multithreading that hopefully will help you out. In this tutorial we look at the two ways of starting a thread … Continue reading →