Write Barriers - Pat Shaughnessy

Ruby’s garbage collection implementation is complex and confusing - yet powerful and beautiful at the same time. Chapter 13 summarizes and explains advanced aspects of Ruby’s garbage collector. I love learning about the difficult bits at a deep enough level to be able to explain them to someone else. In RUM I often show snippets from Ruby's C source code in gray callouts. These sections are for readers who already understand C syntax, or who would like to learn it. These can give you sign posts in case you ever decide to read Ruby’s source code for yourself. .