Ring buffers and mirrored memory

I ran across a useful article on how to use virtual memory tricks to mirror ring buffer memory.  This allows one to virtually concatenate non-contiguous memory (which can come in very handy at times).  Part 2 of the article discusses the implementation of the ring buffer on top of the mirrored memory allocator.

You can find the mirrored queue code referenced in the article on github.  (Note that one of the commenters also points out an optimized POSIX-based implementation that is posted on Wikipedia.)