simplify lockfree_ring_buffer (bonus: a nice performance improvement)
simplify lockfree_ring_buffer (bonus: a nice performance improvement)

brianwatling/libfiber,marioskogias/libfiber,marioskogias/libfiber,marioskogias/libfiber,brianwatling/libfiber,brianwatling/libfiber,brianwatling/libfiber,marioskogias/libfiber