threadpool working perfect; add & delete & run work; need to organize callback a bit;
no no, delete works but is not reliable; I need some other ways to clean up legacy handles;
I have to way to clean up legacy closures; I need a better way to share & lock data among threads;
updating last active time of ccn is not cool; I should work on callback to make sure every closure gets upcall.final eventually;
cleaned up some legacies;