Is there a good introduction to memory barriers?

Question

I am looking for a good online introduction to memory barriers and common errors in Java code:

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

I would be particularly interested in code that shows the behavior and / or examples of solving common problems (for example, creating a map that can be accessed by several threads and where values ​​are added lazily).

Answer 1

You can find this article from Martin Thomson very helpful.

Answer 2

I know what you said online, but Java Concurrency In Practice is a java Concurrency guide these days.

Answer 3

If you want to know more about this from a CPU point of view (which assembler code is generated and how the JVM can optimize byte code), this article might be interesting: Memory Barriers and JVM Concurrency (InfoQ)