Changes

** [http://preshing.com/20130922/acquire-and-release-fences/ Preshing on Programming post] with a good explanation.

** [http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.genc010197a/index.html ARMv8 Instruction Set Architecture Manual] (ARM InfoCentre registration required) - See the section on Acquire/Release and Load/Store, especially Load/Store Exclusive (e.g., LDREX)

==== The Future of Memory ====