own threading rules... it's sort of heavy-handed but given the separation of the reliable and unreliable implementations (and the inability to really know how they are threading from here) this is the safest way and doesn't seem to really affect throughput. git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7047 75d07b2b-3a1a-0410-a2c5-0572b91ccdca