u++ 5.3.0-2 (amd64 binary) in ubuntu karmic

 μC++ is a dialect of C++, extending C++ with new constructs that
 provide advanced control-flow including light-weight concurrency on
 shared-memory uni- and multi-processor computers running UNIX and Linux
 operating systems. μC++ provides new kinds of classes, including
 coroutines, which have independent execution states; tasks, which have
 their own threads; and monitors, which allow for safe communication
 among tasks. These new classes can take part in inheritance,
 overloading, and templates, just like other classes. As well, C++
 exception handling is extended, allowing exceptions to propagate among
 coroutines and tasks. Additional capabilities include: clustering of
 tasks and processors, object-oriented non-blocking I/O for files and
 sockets, and support for real-time programming.