Paul E. McKenney has posted a work-in-progress version of his book, Is Parallel Programming Hard, And, If So, What Can You Do About It?
The purpose of this book is to help you understand how to program shared-memory parallel machines without risking your sanity. By describing the algorithms and designs that have worked well in the past, we hope to help you avoid at least some of the pitfalls that have beset parallel projects. But you should think of this book as a foundation on which to build, rather than as a completed cathedral. Your mission, if you choose to accept, is to help make further progress in the exciting field of parallel programming, progress that should in time render this book obsolete. Parallel programming is not as hard as it is reputed, and it is hoped that this book makes it even easier for you.
This is an open-source project, and so both review comments and patches are quite welcome. Download the PDF or try this Mirror Site.
A mirror of the site can be found on http://ftp.portlane.com/pub/linux/kernel/people/paulmck/perfbook/perfbook.html as kernel.org seems to have troubles.