This still needs work, but i wanted to commit the bits explaining the  zero-copy cache switching that will happen to ensure coherency for  multi-writers with (or without) readers.
This still needs work, but i wanted to commit the bits explaining the 
zero-copy cache switching that will happen to ensure coherency for 
multi-writers with (or without) readers.



git-svn-id: ae92b08b608af1c8cefa3e10d2325ea527204e07@3641 3eda493b-6a19-0410-b2e0-ec8ea4dd8fda

pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable,pscedu/slash2-stable