Gives an introduction to threads and explores the Thread class and runnables.

Explains synchronization, Java's synchronization mechanism, and two problems that arise when developers fail to use that mechanism correctly.

Explains how priority relates to thread scheduling and how to use the wait/notify mechanism to coordinate the activities of multiple threads.

Focuses on thread groups, volatility, thread-local variables, timers, and the ThreadDeath class. Also describes how various thread concepts combine to finalize objects.

Explains how to apply consistent rules for acquiring multiple locks simultaneously, to reduce the likelihood of synchronization deadlocks.

In this article, Brian Goetz looks at some of the commonly proposed fixes and shows how each of them fails to render the DCL idiom thread-safe under the Java Memory Model.

Explains how to fix the double-checked locking idiom by using thread-local variables and takes a look at its performance.

Lab. manual by Astha Ekadiyanto.

Examines the roots of the double-checked locking idiom, why it was developed, and why it doesn't work.

Though many Java books and articles recommend double-checked locking, unfortunately, it is not guaranteed to work in Java.