Is there a good introduction to memory barriers?

Question

I'm looking for a good online introduction to memory barriers and the usual pitfalls in Java code:

• Using synchronized too often or not often enough
• When to use volatile and final
• Double checked locking
• etc.

I'd be especially interested in code which shows the behavior and/or examples how to solve common problems (like creating a map that several threads can access and where values are added lazily).

Answer 1

You might find this article by Martin Thomson very helpful.