Confused about the isns sources

[Xianrui Li]

Hello,
I'm a student and recently I've been learning 
iSNS by reading RFC and isns sources. I think the sources are too complex for me to understand. I wonder wherever you could send me a more clearly explanation about the source like sending a flow chart or more information about threads and global variables. I know some functions' aims, but I don't understand why they should work like this. Flow chart is the best! Thank you!
发自我的 iPhone