more progress on lightweight concurrency
tree4b1345748fe723ad9da7e57a565c56abc8a011dc
-rw-r--r-- 2724 Rakefile
drwxr-xr-x - examples
drwxr-xr-x - ext
drwxr-xr-x - java
drwxr-xr-x - lib
drwxr-xr-x - test